{"version":2,"relationshipURLBase":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html","relationshipResolution":"Resolve relative relationship URLs against relationshipURLBase; complete records and absolute URLs are in blocks.","title":"CLS 02 · 从类别到区域与掩码","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html","markdown":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.md","pages":[{"id":"reading-opening","title":"CLS 02 · 从类别到区域与掩码","unit":"任务究竟要求留下什么信息？","unitId":"spatial-answer-contract","chapter":"II","number":1},{"id":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","title":"1. 同一场景，四种需要交付的答案","unit":"任务究竟要求留下什么信息？","unitId":"spatial-answer-contract","chapter":"II","number":2},{"id":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","title":"2. 从候选区域开始：哪些计算在重复？","unit":"任务究竟要求留下什么信息？","unitId":"spatial-answer-contract","chapter":"II","number":3},{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","unit":"任务究竟要求留下什么信息？","unitId":"spatial-answer-contract","chapter":"II","number":4},{"id":"reading-block-d4372ab8df884c7e9001495510cf38ac","title":"Faster R-CNN：让候选也由特征提出","unit":"任务究竟要求留下什么信息？","unitId":"spatial-answer-contract","chapter":"II","number":5},{"id":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","title":"3. 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page"},{"oldId":"b-31ca1501f6faadd6a90e7460","targetId":"b-31ca1501f6faadd6a90e7460","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"368614551a654385cbe6a0908f43fd7fa103081383b1354ff5d3dfa2afe852f7","afterSHA256":"368614551a654385cbe6a0908f43fd7fa103081383b1354ff5d3dfa2afe852f7","reason":"Same source body in authored semantic page"},{"oldId":"b-fae059918dbc8914a053c273","targetId":"b-fae059918dbc8914a053c273","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"6510f8a7056443cbc1ca6b832d50db26ddb39851a1e6b269e019cb2cdbe60491","afterSHA256":"6510f8a7056443cbc1ca6b832d50db26ddb39851a1e6b269e019cb2cdbe60491","reason":"Same source body in authored semantic 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page"},{"oldId":"b-dd86cb7204a9b1ae0b01e2d7","targetId":"b-dd86cb7204a9b1ae0b01e2d7","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"7847a0ca954a8c49bc9483935cf4017a707eade967a7c84d189d4906d547a3f0","afterSHA256":"7847a0ca954a8c49bc9483935cf4017a707eade967a7c84d189d4906d547a3f0","reason":"Same source body in authored semantic page"},{"oldId":"b-cb620cec509e57a40f6f51f0","targetId":"b-cb620cec509e57a40f6f51f0","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"9558df744959fc495b50a4e6fe4d85cee1da318e2794b9daa5166ce33eb677af","afterSHA256":"9558df744959fc495b50a4e6fe4d85cee1da318e2794b9daa5166ce33eb677af","reason":"Same source body in authored semantic page"},{"oldId":"b-9db782f26e7627533faafec8","targetId":"b-9db782f26e7627533faafec8","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"91b8206b3ca546d4ac742e4604f5f2a772789d28a6976cd2ae51407da524cc8d","afterSHA256":"91b8206b3ca546d4ac742e4604f5f2a772789d28a6976cd2ae51407da524cc8d","reason":"Same source body in authored semantic page"},{"oldId":"b-6ee59b9121ddc1e073864040","targetId":"b-6ee59b9121ddc1e073864040","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"48af3274f4fcbc9c4d91db5e3dbe9c6069d992cf64784f655e2a3a356cb9c78f","afterSHA256":"48af3274f4fcbc9c4d91db5e3dbe9c6069d992cf64784f655e2a3a356cb9c78f","reason":"Same source body in authored semantic page"},{"oldId":"b-8c1c62c5a26dd5d0baa08687","targetId":"b-8c1c62c5a26dd5d0baa08687","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"rewrite","beforeSHA256":"40bf8afdf8af514c8388dbeb6e5e8e772948257420d17639e1c1800fa2618a4e","afterSHA256":"1b73507c14a82c8187735258736188e4d547ea3d5f390b962e7b09a957de34ee","reason":"Same source identity with figure semantics or reading context enriched"},{"oldId":"b-f63749c814a90787f01bc079","targetId":"b-f63749c814a90787f01bc079","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"2daa601372acac2ba8d7139cf14b0d4c28c307833fe6a6c655c3f0d0c7234c07","afterSHA256":"2daa601372acac2ba8d7139cf14b0d4c28c307833fe6a6c655c3f0d0c7234c07","reason":"Same source body in authored semantic page"},{"oldId":"b-b617e860f54b048bbd3b74b9","targetId":"b-b617e860f54b048bbd3b74b9","page":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","operation":"move","beforeSHA256":"edd972fce715af4823578e8295f503a89b6fda00da057a582831e4ea921edae8","afterSHA256":"edd972fce715af4823578e8295f503a89b6fda00da057a582831e4ea921edae8","reason":"Same source body in authored semantic page"},{"oldId":"b-718d70de5592bcef741d7684","targetId":"b-718d70de5592bcef741d7684","page":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","operation":"move","beforeSHA256":"33e80aecf0e69b2f75d68fd49c273ccb6733e4b4f6b9e324e065f40627248924","afterSHA256":"33e80aecf0e69b2f75d68fd49c273ccb6733e4b4f6b9e324e065f40627248924","reason":"Same source body in authored semantic page"},{"oldId":"b-9b2eeb786a3ef72e36dfdf3a","targetId":"b-9b2eeb786a3ef72e36dfdf3a","page":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","operation":"move","beforeSHA256":"4082a61472678ab5d2f8f6ad434aac5a7a26a7755da80e702be3f8e24510f2db","afterSHA256":"4082a61472678ab5d2f8f6ad434aac5a7a26a7755da80e702be3f8e24510f2db","reason":"Same source body in authored semantic page"},{"oldId":"b-82e428a0a761af6e50cd523e","targetId":"b-82e428a0a761af6e50cd523e","page":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","operation":"move","beforeSHA256":"16853b7a9385ca2afae17284eead500f1e6d68ebbaaf142c6480655034c23ff8","afterSHA256":"16853b7a9385ca2afae17284eead500f1e6d68ebbaaf142c6480655034c23ff8","reason":"Same source body in authored semantic page"},{"oldId":"b-f111512216ee1df958268d7e","targetId":"b-f111512216ee1df958268d7e","page":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","operation":"move","beforeSHA256":"617ff24cec08fa67d7163ca56eb019a7b608d8159bd669d789b12f50a29cf487","afterSHA256":"617ff24cec08fa67d7163ca56eb019a7b608d8159bd669d789b12f50a29cf487","reason":"Same source body in authored semantic page"},{"oldId":"b-e736feda904970656ee33edb","targetId":"b-e736feda904970656ee33edb","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"404d05b630fd6c72061980287782797c6b2be5c1516048ea95fba9737cbc23e3","afterSHA256":"404d05b630fd6c72061980287782797c6b2be5c1516048ea95fba9737cbc23e3","reason":"Same source body in authored semantic page"},{"oldId":"b-cb5fa3cdd2eefb000fb027cb","targetId":"b-cb5fa3cdd2eefb000fb027cb","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"f299419f538d4d839c1cc629d60cb3d69f3e0f4df3496a3bb0712702fd33981d","afterSHA256":"f299419f538d4d839c1cc629d60cb3d69f3e0f4df3496a3bb0712702fd33981d","reason":"Same source body in authored semantic page"},{"oldId":"b-dcd9bbd33d0ae1c5c02d64b9","targetId":"b-dcd9bbd33d0ae1c5c02d64b9","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"84d97021270242f8f85621826f6e717554a13fc41a10462fc3331c92d448d78d","afterSHA256":"84d97021270242f8f85621826f6e717554a13fc41a10462fc3331c92d448d78d","reason":"Same source body in authored semantic page"},{"oldId":"b-335fb9b7ca2be083324e985d","targetId":"b-335fb9b7ca2be083324e985d","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"0254c464699931f4e8a94d6c6af0a2bc4c53bdde4b9d1019cff6952807e3ee22","afterSHA256":"0254c464699931f4e8a94d6c6af0a2bc4c53bdde4b9d1019cff6952807e3ee22","reason":"Same source body in authored semantic page"},{"oldId":"b-af8b51a51f0d14f6f3738f53","targetId":"b-af8b51a51f0d14f6f3738f53","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"b7b3c227173d4b0c5cb96f03c493356a237040690ce69e7489fcda368efa7ba2","afterSHA256":"b7b3c227173d4b0c5cb96f03c493356a237040690ce69e7489fcda368efa7ba2","reason":"Same source body in authored semantic page"},{"oldId":"b-a62209b8c607d83834f2eb10","targetId":"b-a62209b8c607d83834f2eb10","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"9569a978e75d71606880af6b55e6fc92588aaf70d656d123a2509a666159ae33","afterSHA256":"9569a978e75d71606880af6b55e6fc92588aaf70d656d123a2509a666159ae33","reason":"Same source body in authored semantic page"},{"oldId":"b-7c713772855259acf51ba949","targetId":"b-7c713772855259acf51ba949","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"dc13f0081162fce1e534c43afae81f17fde3f2817e5aa4b8bb144a503c53b753","afterSHA256":"dc13f0081162fce1e534c43afae81f17fde3f2817e5aa4b8bb144a503c53b753","reason":"Same source body in authored semantic page"},{"oldId":"b-bda422764bbc9b5f669e9751","targetId":"b-bda422764bbc9b5f669e9751","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"ef24d9157c0c6d6f7478624bbf0ee737e86a0b51d23abea100d898a798f2379d","afterSHA256":"ef24d9157c0c6d6f7478624bbf0ee737e86a0b51d23abea100d898a798f2379d","reason":"Same source body in authored semantic page"},{"oldId":"b-a7a55e4cdc6a743d5b253cec","targetId":"b-a7a55e4cdc6a743d5b253cec","page":"reading-block-54fc84db76d5470fa0ca91903c73280d","operation":"move","beforeSHA256":"c3d62dc69757ae5a362a722b6c8be23d225bf94d45c557eacfcd4c2eac3b8d33","afterSHA256":"c3d62dc69757ae5a362a722b6c8be23d225bf94d45c557eacfcd4c2eac3b8d33","reason":"Same source body in authored semantic page"},{"oldId":"b-21b8a2d0ad2acb451566d8e6","targetId":"b-21b8a2d0ad2acb451566d8e6","page":"reading-block-d4372ab8df884c7e9001495510cf38ac","operation":"move","beforeSHA256":"1941132ee9a48e470386b6fafa146e43f6e8f6038a7e876370cbbbd38d5ab094","afterSHA256":"1941132ee9a48e470386b6fafa146e43f6e8f6038a7e876370cbbbd38d5ab094","reason":"Same source body in authored semantic page"},{"oldId":"b-2bb3a3afed119eed575eeeaf","targetId":"b-2bb3a3afed119eed575eeeaf","page":"reading-block-d4372ab8df884c7e9001495510cf38ac","operation":"move","beforeSHA256":"286c4fb1d7d1e3ff9c12364a9d4fe22942ce062b2cd59c79c4449ee87d8f9a81","afterSHA256":"286c4fb1d7d1e3ff9c12364a9d4fe22942ce062b2cd59c79c4449ee87d8f9a81","reason":"Same source body in authored semantic page"},{"oldId":"b-eb240fd7361c46fcc3f56f05","targetId":"b-eb240fd7361c46fcc3f56f05","page":"reading-block-d4372ab8df884c7e9001495510cf38ac","operation":"move","beforeSHA256":"ffe20acce4bf153e3035979909f94f55a9f78f0368cc4c492dc3439f183b4f05","afterSHA256":"ffe20acce4bf153e3035979909f94f55a9f78f0368cc4c492dc3439f183b4f05","reason":"Same source body in authored semantic page"},{"oldId":"b-10df520805b6bb67b2527b15","targetId":"b-10df520805b6bb67b2527b15","page":"reading-block-d4372ab8df884c7e9001495510cf38ac","operation":"move","beforeSHA256":"c3c8933178e11ad668ec0f0b8b7b1b95050ef1b88e5bc16435473966fcef57ca","afterSHA256":"c3c8933178e11ad668ec0f0b8b7b1b95050ef1b88e5bc16435473966fcef57ca","reason":"Same source body in authored semantic page"},{"oldId":"b-2032da6248c1036b128fb137","targetId":"b-2032da6248c1036b128fb137","page":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","operation":"move","beforeSHA256":"2e763361c071d020424939ff43a5c3a4ab7ce9cb749a88ae077ab3c93fa075ab","afterSHA256":"2e763361c071d020424939ff43a5c3a4ab7ce9cb749a88ae077ab3c93fa075ab","reason":"Same source body in authored semantic page"},{"oldId":"b-d45ade1c7bba7de5fd33809c","targetId":"b-d45ade1c7bba7de5fd33809c","page":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","operation":"move","beforeSHA256":"c4495cfa2bc9337007b9041d1f1c21ec4758b4e475f79bd830a80212b304b991","afterSHA256":"c4495cfa2bc9337007b9041d1f1c21ec4758b4e475f79bd830a80212b304b991","reason":"Same source body in authored semantic page"},{"oldId":"b-f6b5d544ee691fed02665bcc","targetId":"b-f6b5d544ee691fed02665bcc","page":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","operation":"move","beforeSHA256":"f7a35b191037a3d4ce1a0380354829523a6771e8f0f817b75d9680684ce80630","afterSHA256":"f7a35b191037a3d4ce1a0380354829523a6771e8f0f817b75d9680684ce80630","reason":"Same source body in authored semantic page"},{"oldId":"b-b5e1e21918abb357539ba5aa","targetId":"b-b5e1e21918abb357539ba5aa","page":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","operation":"move","beforeSHA256":"577437aff921fbc4647e84807f5595582e274dea1f87371f95b51589c0894d0c","afterSHA256":"577437aff921fbc4647e84807f5595582e274dea1f87371f95b51589c0894d0c","reason":"Same source body in authored semantic page"},{"oldId":"b-8932a00ff93bc993bf5cc1bd","targetId":"b-8932a00ff93bc993bf5cc1bd","page":"reading-block-12a787367f384e0488a579b23fda1697","operation":"move","beforeSHA256":"dc05eba83709d1f2c0985d6db940e5103d6582e3fb39bd9ebd978e12296733f3","afterSHA256":"dc05eba83709d1f2c0985d6db940e5103d6582e3fb39bd9ebd978e12296733f3","reason":"Same source body in authored semantic page"},{"oldId":"b-be7b870cc6d24ce6e782d3b2","targetId":"b-be7b870cc6d24ce6e782d3b2","page":"reading-block-12a787367f384e0488a579b23fda1697","operation":"move","beforeSHA256":"4315899214ace3122af7837a92b12cef47f61220095734ec4dd0e19a7fbe226c","afterSHA256":"4315899214ace3122af7837a92b12cef47f61220095734ec4dd0e19a7fbe226c","reason":"Same source body in authored semantic page"},{"oldId":"b-a8d029d73ed007e323ff6317","targetId":"b-a8d029d73ed007e323ff6317","page":"reading-block-12a787367f384e0488a579b23fda1697","operation":"move","beforeSHA256":"fbe4d1e5608e40faeeb35a3c3975873092abf1175971bc88762ea0bf790b501b","afterSHA256":"fbe4d1e5608e40faeeb35a3c3975873092abf1175971bc88762ea0bf790b501b","reason":"Same source body in authored semantic page"},{"oldId":"b-06b3262e54d89347dbe00ddc","targetId":"b-06b3262e54d89347dbe00ddc","page":"reading-block-12a787367f384e0488a579b23fda1697","operation":"move","beforeSHA256":"78096848c14e7d043d51b8dc0088a2123db4de3a5230dc9463f4142ec443f6f7","afterSHA256":"78096848c14e7d043d51b8dc0088a2123db4de3a5230dc9463f4142ec443f6f7","reason":"Same source body in authored semantic page"},{"oldId":"b-66ecefe0504e46c31912ad18","targetId":"b-66ecefe0504e46c31912ad18","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"2e87794226804507619bf969cd5e820a00c844e3035b041ef7d85a150bec2585","afterSHA256":"2e87794226804507619bf969cd5e820a00c844e3035b041ef7d85a150bec2585","reason":"Same source body in authored semantic page"},{"oldId":"b-78dfe963fc2a706764e49e63","targetId":"b-78dfe963fc2a706764e49e63","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"428933cde02fcd188c5af97a769c87d3ea97224faf664f121e9acd426b609f77","afterSHA256":"428933cde02fcd188c5af97a769c87d3ea97224faf664f121e9acd426b609f77","reason":"Same source body in authored semantic page"},{"oldId":"b-e062f08142ae19fb87f7b0dd","targetId":"b-e062f08142ae19fb87f7b0dd","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"a8d0554a4b724ae5885ad7712a40d52607411e7ccc7607c7c7399c7baa86d80b","afterSHA256":"a8d0554a4b724ae5885ad7712a40d52607411e7ccc7607c7c7399c7baa86d80b","reason":"Same source body in authored semantic page"},{"oldId":"b-66bdeff47c8133239087d853","targetId":"b-66bdeff47c8133239087d853","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"e286a1a550e5ac7f30392f8844555a7b565c076a33a00b4845dd8fa98e07d0d0","afterSHA256":"e286a1a550e5ac7f30392f8844555a7b565c076a33a00b4845dd8fa98e07d0d0","reason":"Same source body in authored semantic page"},{"oldId":"b-b8cdf4e66c8dad44d53df67d","targetId":"b-b8cdf4e66c8dad44d53df67d","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"56db1e61b00c066c49888dc0cf11a0672a5b5f615447ceab22addd3aac902ea9","afterSHA256":"56db1e61b00c066c49888dc0cf11a0672a5b5f615447ceab22addd3aac902ea9","reason":"Same source body in authored semantic page"},{"oldId":"b-63697f97b9e33b9ea1ae61e7","targetId":"b-63697f97b9e33b9ea1ae61e7","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"65bd58535f055b29f19b0932d12ba8bf5af8f869114e38372c5648dbfda40e5c","afterSHA256":"65bd58535f055b29f19b0932d12ba8bf5af8f869114e38372c5648dbfda40e5c","reason":"Same source body in authored semantic page"},{"oldId":"b-c3196b80fd767bb556ba3fab","targetId":"b-c3196b80fd767bb556ba3fab","page":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","operation":"move","beforeSHA256":"74f6c801871ab4f57344e84fd4bf08f6a85b501135e90d633f7a5247d66f09f0","afterSHA256":"74f6c801871ab4f57344e84fd4bf08f6a85b501135e90d633f7a5247d66f09f0","reason":"Same source body in authored semantic page"},{"oldId":"b-475c00b5ad2acbed61549722","targetId":"b-475c00b5ad2acbed61549722","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"28879a9fb74cdb37b2a545c11011cdc1a7bd70f891679ac460475235141aac71","afterSHA256":"28879a9fb74cdb37b2a545c11011cdc1a7bd70f891679ac460475235141aac71","reason":"Same source body in authored semantic page"},{"oldId":"b-bce0ff0d79d5b14e1bf5855e","targetId":"b-bce0ff0d79d5b14e1bf5855e","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"863e1dd240e7f07f37c886dbe0ea146239d2e398372d2fa52a23acc83cbf87cf","afterSHA256":"863e1dd240e7f07f37c886dbe0ea146239d2e398372d2fa52a23acc83cbf87cf","reason":"Same source body in authored semantic page"},{"oldId":"b-0ba492d32fc7f594c0fcd53e","targetId":"b-0ba492d32fc7f594c0fcd53e","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"85b70e0efc2a955752791379515eb9c4d5ab5c44f0f1efe72c79a9223462abc2","afterSHA256":"85b70e0efc2a955752791379515eb9c4d5ab5c44f0f1efe72c79a9223462abc2","reason":"Same source body in authored semantic page"},{"oldId":"b-dae42c5e3659adec91ce4a26","targetId":"b-dae42c5e3659adec91ce4a26","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"80762b6a6d52f4eb45dc142aad3e903a38666c97acd8dc60225546389e97d69b","afterSHA256":"80762b6a6d52f4eb45dc142aad3e903a38666c97acd8dc60225546389e97d69b","reason":"Same source body in authored semantic page"},{"oldId":"b-8546f315c4959a7c1fae21c8","targetId":"b-8546f315c4959a7c1fae21c8","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"5fa9bc5cf35e392a55457c3ad1fc84964860f8152b9671869ee2f531f75180cc","afterSHA256":"5fa9bc5cf35e392a55457c3ad1fc84964860f8152b9671869ee2f531f75180cc","reason":"Same source body in authored semantic page"},{"oldId":"b-68fee5e3d925b55e6fced3d6","targetId":"b-68fee5e3d925b55e6fced3d6","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"64797818bd83af7750b0cb4d9adc3a9363126cd5f94d652bf6d76f1fc52897f8","afterSHA256":"64797818bd83af7750b0cb4d9adc3a9363126cd5f94d652bf6d76f1fc52897f8","reason":"Same source body in authored semantic page"},{"oldId":"b-958e1fc43095eb6e9b564204","targetId":"b-958e1fc43095eb6e9b564204","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"53b32791c4ea43835b81b123176b6b3aea5f9c6f4dee70cbc7010e2666e9ba7d","afterSHA256":"53b32791c4ea43835b81b123176b6b3aea5f9c6f4dee70cbc7010e2666e9ba7d","reason":"Same source body in authored semantic page"},{"oldId":"b-36c2f305aba7da016bde152a","targetId":"b-36c2f305aba7da016bde152a","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"rewrite","beforeSHA256":"d8653d9f4e2093be995591d5d5148c5666df2c262a50db8b2321e53a21850d07","afterSHA256":"3f794df3969648c97acb779e523ba8e7015124b6f6676e8fe637418ee9c2b038","reason":"Same source identity with figure semantics or reading context enriched"},{"oldId":"b-83de197e48e556e81b42f24c","targetId":"b-83de197e48e556e81b42f24c","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"b64b0bb3ae2080d3245f63a1ff3f384755dd0696b6b0cdf3385b579779cfb3a2","afterSHA256":"b64b0bb3ae2080d3245f63a1ff3f384755dd0696b6b0cdf3385b579779cfb3a2","reason":"Same source body in authored semantic page"},{"oldId":"b-b6922f91a529cf8061a029bb","targetId":"b-b6922f91a529cf8061a029bb","page":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","operation":"move","beforeSHA256":"b1bd03e79cc5bb9835393d1cc7310cde4635979e1704d3fcb1ee99ccc811225d","afterSHA256":"b1bd03e79cc5bb9835393d1cc7310cde4635979e1704d3fcb1ee99ccc811225d","reason":"Same source body in authored semantic page"},{"oldId":"b-87824fe1290e0e3530c69f33","targetId":"b-87824fe1290e0e3530c69f33","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"move","beforeSHA256":"f0936066f68628916925f16edf1dce043f77623c4b72dcb54e352fd1c993a788","afterSHA256":"f0936066f68628916925f16edf1dce043f77623c4b72dcb54e352fd1c993a788","reason":"Same source body in authored semantic page"},{"oldId":"b-47fb73508f756448d3c0a836","targetId":"b-47fb73508f756448d3c0a836","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"move","beforeSHA256":"3bb8d279d8595e2246936d624e3b4edea6ceca91fece02cd289fada770a219f4","afterSHA256":"3bb8d279d8595e2246936d624e3b4edea6ceca91fece02cd289fada770a219f4","reason":"Same source body in authored semantic page"},{"oldId":"b-e652a9cb67eb772d30f1ca01","targetId":"b-e652a9cb67eb772d30f1ca01","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"rewrite","beforeSHA256":"0bfedb1ed97588d37565883224ab357ea9af5995f6404d1f3d1042d261fbdfd8","afterSHA256":"f59df6ce113db0faf2717e5b8440d85ef1f069b2e8b327b430459828cfd41119","reason":"Same source identity with figure semantics or reading context enriched"},{"oldId":"b-d32f2e7203dd75e6e16286cc","targetId":"b-d32f2e7203dd75e6e16286cc","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"move","beforeSHA256":"4cdba8cde1b8262a042dd6aa8cda6abe7fd5a4e8cb6f224f5bb95e0f3611cd8d","afterSHA256":"4cdba8cde1b8262a042dd6aa8cda6abe7fd5a4e8cb6f224f5bb95e0f3611cd8d","reason":"Same source body in authored semantic page"},{"oldId":"b-1ac7a5c0e7ad25db9f46aa80","targetId":"b-1ac7a5c0e7ad25db9f46aa80","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"move","beforeSHA256":"a75c59c916a80252869b500277c7120d64fcb5056b16b7893076a6f49e7c3632","afterSHA256":"a75c59c916a80252869b500277c7120d64fcb5056b16b7893076a6f49e7c3632","reason":"Same source body in authored semantic page"},{"oldId":"b-3a594b0bac2b1277ecc2f513","targetId":"b-3a594b0bac2b1277ecc2f513","page":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","operation":"move","beforeSHA256":"2cdf08a58cb22b63b3f0dc0f683f633279484efbb6c1a8e2e4c9f110169c86c9","afterSHA256":"2cdf08a58cb22b63b3f0dc0f683f633279484efbb6c1a8e2e4c9f110169c86c9","reason":"Same source body in authored semantic page"},{"oldId":"b-79f56c43aae39029282dc1fa","targetId":"b-79f56c43aae39029282dc1fa","page":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","operation":"move","beforeSHA256":"5e5a1a7ea48b445ba9600de63532fa821f57bc541c390a03b88e3f186ff79aee","afterSHA256":"5e5a1a7ea48b445ba9600de63532fa821f57bc541c390a03b88e3f186ff79aee","reason":"Same source body in authored semantic page"},{"oldId":"b-01f8407d6f648d890dee863d","targetId":"b-01f8407d6f648d890dee863d","page":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","operation":"move","beforeSHA256":"98a121d6c2ec657d35f6ad37c3572879756014fb06ae37f74a55f4b3a2937f27","afterSHA256":"98a121d6c2ec657d35f6ad37c3572879756014fb06ae37f74a55f4b3a2937f27","reason":"Same source body in authored semantic page"},{"oldId":"b-99a3068c46d0715f6e089f47","targetId":"b-99a3068c46d0715f6e089f47","page":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","operation":"move","beforeSHA256":"4bdb5b299368f73f1edf5f386d95ee6ac712a8d2fb34d8e7402393ba7ab7c379","afterSHA256":"4bdb5b299368f73f1edf5f386d95ee6ac712a8d2fb34d8e7402393ba7ab7c379","reason":"Same source body in authored semantic page"},{"oldId":"b-cd882914f3d0734c36a5f740","targetId":"b-cd882914f3d0734c36a5f740","page":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","operation":"move","beforeSHA256":"e94ed81106e2b429171f16434f32eb6c393f2620343caf5c55a2fa150a668985","afterSHA256":"e94ed81106e2b429171f16434f32eb6c393f2620343caf5c55a2fa150a668985","reason":"Same source body in authored semantic page"},{"oldId":"b-0cc775fbcf574449a2a04e4e","targetId":"b-0cc775fbcf574449a2a04e4e","page":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","operation":"move","beforeSHA256":"97c6ebeeb2c6145e77f6ee50a38a0c718cf6a9716c5cb81ef7e2d329dbdc61b0","afterSHA256":"97c6ebeeb2c6145e77f6ee50a38a0c718cf6a9716c5cb81ef7e2d329dbdc61b0","reason":"Same source body in authored semantic page"},{"oldId":"b-3b08b1270363e0e1e9f8a735","targetId":"b-3b08b1270363e0e1e9f8a735","page":"reading-block-673e073110a3452fbc7257bc532e6383","operation":"move","beforeSHA256":"4674434284071bd4a08f28cd90248b95e620966254e460bd13c7190888871f5e","afterSHA256":"4674434284071bd4a08f28cd90248b95e620966254e460bd13c7190888871f5e","reason":"Same source body in authored semantic page"},{"oldId":"b-09e2dc5f56312617f2b87d76","targetId":"b-09e2dc5f56312617f2b87d76","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"3ab20d98377f7bd830665ddf2191c129c9192d1d9313152bc1c5b443cd62973a","afterSHA256":"3ab20d98377f7bd830665ddf2191c129c9192d1d9313152bc1c5b443cd62973a","reason":"Same source body in authored semantic page"},{"oldId":"b-0d351e7ff98ab177209fe261","targetId":"b-0d351e7ff98ab177209fe261","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"56e7c036b4f4f45007a9bb867592b5303af825844c50e015a082b7a5ff5f8446","afterSHA256":"56e7c036b4f4f45007a9bb867592b5303af825844c50e015a082b7a5ff5f8446","reason":"Same source body in authored semantic page"},{"oldId":"b-83ff759cdb37a489a631b42a","targetId":"b-83ff759cdb37a489a631b42a","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"b4fc40a21ed69c43b6d314267ce3e4c2d4c5b7ac80bea0111de8c7fdda89c3ae","afterSHA256":"b4fc40a21ed69c43b6d314267ce3e4c2d4c5b7ac80bea0111de8c7fdda89c3ae","reason":"Same source body in authored semantic page"},{"oldId":"b-a8d89f3029827f53e5406c16","targetId":"b-a8d89f3029827f53e5406c16","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"0477ef728ef80f0e9c50f2e6e04b9240e3247b8ec2e7d94d69df73c5cb655bef","afterSHA256":"0477ef728ef80f0e9c50f2e6e04b9240e3247b8ec2e7d94d69df73c5cb655bef","reason":"Same source body in authored semantic page"},{"oldId":"b-056a38c98a01ae6565e7a9a5","targetId":"b-056a38c98a01ae6565e7a9a5","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"3ab59c7ac0c844366f525ff129aa8a1133bc3f0501d18d73a801db127544fa1e","afterSHA256":"3ab59c7ac0c844366f525ff129aa8a1133bc3f0501d18d73a801db127544fa1e","reason":"Same source body in authored semantic page"},{"oldId":"b-585b42eb3a0fae316ac42993","targetId":"b-585b42eb3a0fae316ac42993","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"d81be8895ad7921895d1f461f04b87ae6a1812cacfdfd8bae29397181d035b00","afterSHA256":"d81be8895ad7921895d1f461f04b87ae6a1812cacfdfd8bae29397181d035b00","reason":"Same source body in authored semantic page"},{"oldId":"b-7114dd9916e9b78257b2d4d2","targetId":"b-7114dd9916e9b78257b2d4d2","page":"reading-block-fd0dc77671064e8ab452f36d817bc71b","operation":"move","beforeSHA256":"67b3d3c3aad52c0d80e2601a93b15e852b3304b341f8f30e0eaa71ce59012241","afterSHA256":"67b3d3c3aad52c0d80e2601a93b15e852b3304b341f8f30e0eaa71ce59012241","reason":"Same source body in authored semantic 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的语言入口](/course/pages/l3-r2-p48.html)：同一幅图，为什么要从类别走向框、像素和实例？","sha256":"5b3d921bbc8baf820220afd72bcf1795c3060e0714829b356e4c42bb22b59361","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-opening","title":"CLS 02 · 从类别到区域与掩码","number":1},"sectionTitle":"CLS 02 · 从类别到区域与掩码","currentQuestion":"CLS 02 · 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11：RGB→mask](https://deepnote.com/project/38755e4e-23f6-4f5f-8c68-8a2e4114b1c1/notebook/9e268706471944e3a59e6f568f9ce9a3) 中选一本。框公式查 [CLS 07](https://deepnote.com/project/38755e4e-23f6-4f5f-8c68-8a2e4114b1c1/notebook/586e66e049764158a50747e69c219312)，像素损失与实例区别查 [CLS 08](https://deepnote.com/project/38755e4e-23f6-4f5f-8c68-8a2e4114b1c1/notebook/2d81e2a1936043349eacb71c53c0defa)，不必按编号全部运行。","sha256":"88eb52f758ba619b266cd6a7df490accbf0ddbd895b06e5532f4e2ead6d6fa28","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-opening","title":"CLS 02 · 从类别到区域与掩码","number":1},"sectionTitle":"CLS 02 · 从类别到区域与掩码","currentQuestion":"CLS 02 · 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同一场景，四种需要交付的答案","number":2},"sectionTitle":"1. 同一场景，四种需要交付的答案","currentQuestion":"1. 同一场景，四种需要交付的答案","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8c1c62c5a26dd5d0baa08687","nextBlock":"b-b617e860f54b048bbd3b74b9","prerequisites":[{"id":"b-a58da09f5ceb72c39583e1f4","url":"#b-a58da09f5ceb72c39583e1f4","role":"section-title"},{"id":"b-2aa44c8198179b7ba2aab3ae","url":"#b-2aa44c8198179b7ba2aab3ae","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b617e860f54b048bbd3b74b9","type":"p","scope":"block-dadca1922cc149af84b5a598bf7ef9f4","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-b617e860f54b048bbd3b74b9","content":"**先预测：** 如果只保留“杯子、书”两个词，后续能从这两个词恢复第二只杯子的坐标吗？新任务改变了输出，也改变了训练答案必须包含的信息。","sha256":"edd972fce715af4823578e8295f503a89b6fda00da057a582831e4ea921edae8","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-e057d39976ab4b019d5b6ded6289b6d4","title":"1. 同一场景，四种需要交付的答案","number":2},"sectionTitle":"1. 同一场景，四种需要交付的答案","currentQuestion":"1. 同一场景，四种需要交付的答案","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-f63749c814a90787f01bc079","nextBlock":null,"prerequisites":[{"id":"b-a58da09f5ceb72c39583e1f4","url":"#b-a58da09f5ceb72c39583e1f4","role":"section-title"},{"id":"b-2aa44c8198179b7ba2aab3ae","url":"#b-2aa44c8198179b7ba2aab3ae","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-718d70de5592bcef741d7684","type":"h3","scope":"block-539971d2bdc14788bac3c5dd86c6ee79","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-718d70de5592bcef741d7684","content":"### 2. 从候选区域开始：哪些计算在重复？","sha256":"33e80aecf0e69b2f75d68fd49c273ccb6733e4b4f6b9e324e065f40627248924","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","title":"2. 从候选区域开始：哪些计算在重复？","number":3},"sectionTitle":"2. 从候选区域开始：哪些计算在重复？","currentQuestion":"2. 从候选区域开始：哪些计算在重复？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-9b2eeb786a3ef72e36dfdf3a","prerequisites":[{"id":"b-9b2eeb786a3ef72e36dfdf3a","url":"#b-9b2eeb786a3ef72e36dfdf3a","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-9b2eeb786a3ef72e36dfdf3a","type":"p","scope":"block-baa2d848a3684e9fa7adcc551b6b653f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-9b2eeb786a3ef72e36dfdf3a","content":"R-CNN 把可能含有对象的区域提出来，将每个区域变成网络可以处理的输入，再抽取特征、分类与修正框。预训练来自有监督图像分类，然后用检测数据适配。[R-CNN](https://arxiv.org/abs/1311.2524)","sha256":"4082a61472678ab5d2f8f6ad434aac5a7a26a7755da80e702be3f8e24510f2db","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","title":"2. 从候选区域开始：哪些计算在重复？","number":3},"sectionTitle":"2. 从候选区域开始：哪些计算在重复？","currentQuestion":"2. 从候选区域开始：哪些计算在重复？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-718d70de5592bcef741d7684","nextBlock":"b-82e428a0a761af6e50cd523e","prerequisites":[{"id":"b-718d70de5592bcef741d7684","url":"#b-718d70de5592bcef741d7684","role":"section-title"}],"relatedBlocks":[]},{"id":"b-82e428a0a761af6e50cd523e","type":"p","scope":"block-baa2d848a3684e9fa7adcc551b6b653f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-82e428a0a761af6e50cd523e","content":"用手沿图中的杯子画三个重叠候选框。它们包含了许多相同像素；如果每个候选都单独跑一遍卷积，就重复计算了共有的杯身和桌面。框越多，重复越明显。","sha256":"16853b7a9385ca2afae17284eead500f1e6d68ebbaaf142c6480655034c23ff8","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","title":"2. 从候选区域开始：哪些计算在重复？","number":3},"sectionTitle":"2. 从候选区域开始：哪些计算在重复？","currentQuestion":"2. 从候选区域开始：哪些计算在重复？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-9b2eeb786a3ef72e36dfdf3a","nextBlock":"b-f111512216ee1df958268d7e","prerequisites":[{"id":"b-718d70de5592bcef741d7684","url":"#b-718d70de5592bcef741d7684","role":"section-title"},{"id":"b-9b2eeb786a3ef72e36dfdf3a","url":"#b-9b2eeb786a3ef72e36dfdf3a","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-f111512216ee1df958268d7e","type":"p","scope":"block-baa2d848a3684e9fa7adcc551b6b653f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-f111512216ee1df958268d7e","content":"这一步的关键不是“发现了更多模型”，而是发现计算可以复用：**能否先对整张图计算一次，再从共享特征图上读取每个区域？** 框的位置仍必须传给区域读取环节，整图共享并不等于所有对象混成一个向量。","sha256":"617ff24cec08fa67d7163ca56eb019a7b608d8159bd669d789b12f50a29cf487","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-539971d2bdc14788bac3c5dd86c6ee79","title":"2. 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共享整图卷积：固定输出形状，保留区域身份","sha256":"404d05b630fd6c72061980287782797c6b2be5c1516048ea95fba9737cbc23e3","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-cb5fa3cdd2eefb000fb027cb","prerequisites":[{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-cb5fa3cdd2eefb000fb027cb","type":"p","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-cb5fa3cdd2eefb000fb027cb","content":"SPP-net 和 Fast R-CNN 将大量卷积计算移到整图共享阶段。对不同大小候选，区域池化再得到固定形状的区域特征，使后续分类/框回归可以共用参数。[SPP-net](https://arxiv.org/abs/1406.4729) · [Fast R-CNN](https://arxiv.org/abs/1504.08083)","sha256":"f299419f538d4d839c1cc629d60cb3d69f3e0f4df3496a3bb0712702fd33981d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-e736feda904970656ee33edb","nextBlock":"b-dcd9bbd33d0ae1c5c02d64b9","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"}],"relatedBlocks":[]},{"id":"b-dcd9bbd33d0ae1c5c02d64b9","type":"p","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-dcd9bbd33d0ae1c5c02d64b9","content":"沿同一张图追踪：","sha256":"84d97021270242f8f85621826f6e717554a13fc41a10462fc3331c92d448d78d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-cb5fa3cdd2eefb000fb027cb","nextBlock":"b-335fb9b7ca2be083324e985d","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-335fb9b7ca2be083324e985d","type":"ol","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-335fb9b7ca2be083324e985d","content":"- 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原图经过主干，得到仍有空间位置的共享特征图 F。","sha256":"b7b3c227173d4b0c5cb96f03c493356a237040690ce69e7489fcda368efa7ba2","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-335fb9b7ca2be083324e985d","nextBlock":"b-a62209b8c607d83834f2eb10","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-a62209b8c607d83834f2eb10","type":"li","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-a62209b8c607d83834f2eb10","content":"- 框坐标从原图坐标系映射到 F 的坐标系。","sha256":"9569a978e75d71606880af6b55e6fc92588aaf70d656d123a2509a666159ae33","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-af8b51a51f0d14f6f3738f53","nextBlock":"b-7c713772855259acf51ba949","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-7c713772855259acf51ba949","type":"li","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-7c713772855259acf51ba949","content":"- 区域读取把各框内特征整理成固定形状。","sha256":"dc13f0081162fce1e534c43afae81f17fde3f2817e5aa4b8bb144a503c53b753","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a62209b8c607d83834f2eb10","nextBlock":"b-bda422764bbc9b5f669e9751","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-bda422764bbc9b5f669e9751","type":"li","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-bda422764bbc9b5f669e9751","content":"- 每个区域分别输出类别与修正后的坐标。","sha256":"ef24d9157c0c6d6f7478624bbf0ee737e86a0b51d23abea100d898a798f2379d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-7c713772855259acf51ba949","nextBlock":"b-a7a55e4cdc6a743d5b253cec","prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-a7a55e4cdc6a743d5b253cec","type":"p","scope":"block-54fc84db76d5470fa0ca91903c73280d","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-a7a55e4cdc6a743d5b253cec","content":"杯一、杯二的区域身份没有因计算共享而消失。需要进一步追问的是：区域最初从哪里来，能否也学习？","sha256":"c3d62dc69757ae5a362a722b6c8be23d225bf94d45c557eacfcd4c2eac3b8d33","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-54fc84db76d5470fa0ca91903c73280d","title":"共享整图卷积：固定输出形状，保留区域身份","number":4},"sectionTitle":"共享整图卷积：固定输出形状，保留区域身份","currentQuestion":"共享整图卷积：固定输出形状，保留区域身份","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-bda422764bbc9b5f669e9751","nextBlock":null,"prerequisites":[{"id":"b-e736feda904970656ee33edb","url":"#b-e736feda904970656ee33edb","role":"section-title"},{"id":"b-cb5fa3cdd2eefb000fb027cb","url":"#b-cb5fa3cdd2eefb000fb027cb","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-21b8a2d0ad2acb451566d8e6","type":"h3","scope":"block-d4372ab8df884c7e9001495510cf38ac","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-21b8a2d0ad2acb451566d8e6","content":"### Faster R-CNN：让候选也由特征提出","sha256":"1941132ee9a48e470386b6fafa146e43f6e8f6038a7e876370cbbbd38d5ab094","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-d4372ab8df884c7e9001495510cf38ac","title":"Faster R-CNN：让候选也由特征提出","number":5},"sectionTitle":"Faster R-CNN：让候选也由特征提出","currentQuestion":"Faster R-CNN：让候选也由特征提出","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-2bb3a3afed119eed575eeeaf","prerequisites":[{"id":"b-2bb3a3afed119eed575eeeaf","url":"#b-2bb3a3afed119eed575eeeaf","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-2bb3a3afed119eed575eeeaf","type":"p","scope":"block-d4372ab8df884c7e9001495510cf38ac","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-2bb3a3afed119eed575eeeaf","content":"Faster R-CNN 的区域建议网络（RPN）在共享特征图上预测候选是否像对象，并调整候选框的位置。它把“值得进一步查看的区域”也变成可训练输出，再交给后续区域分类与框回归。[Faster R-CNN](https://arxiv.org/abs/1506.01497)","sha256":"286c4fb1d7d1e3ff9c12364a9d4fe22942ce062b2cd59c79c4449ee87d8f9a81","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-d4372ab8df884c7e9001495510cf38ac","title":"Faster R-CNN：让候选也由特征提出","number":5},"sectionTitle":"Faster R-CNN：让候选也由特征提出","currentQuestion":"Faster R-CNN：让候选也由特征提出","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-21b8a2d0ad2acb451566d8e6","nextBlock":"b-eb240fd7361c46fcc3f56f05","prerequisites":[{"id":"b-21b8a2d0ad2acb451566d8e6","url":"#b-21b8a2d0ad2acb451566d8e6","role":"section-title"}],"relatedBlocks":[]},{"id":"b-eb240fd7361c46fcc3f56f05","type":"p","scope":"block-d4372ab8df884c7e9001495510cf38ac","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-eb240fd7361c46fcc3f56f05","content":"三步的变化可以这样读：逐区域重复抽特征 → 整图特征共享 → 在共享特征上学习提出候选。检测监督包含对象类别与框；已有分类权重提供起点，新的输出仍需学习。","sha256":"ffe20acce4bf153e3035979909f94f55a9f78f0368cc4c492dc3439f183b4f05","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-d4372ab8df884c7e9001495510cf38ac","title":"Faster R-CNN：让候选也由特征提出","number":5},"sectionTitle":"Faster R-CNN：让候选也由特征提出","currentQuestion":"Faster R-CNN：让候选也由特征提出","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-2bb3a3afed119eed575eeeaf","nextBlock":"b-10df520805b6bb67b2527b15","prerequisites":[{"id":"b-21b8a2d0ad2acb451566d8e6","url":"#b-21b8a2d0ad2acb451566d8e6","role":"section-title"},{"id":"b-2bb3a3afed119eed575eeeaf","url":"#b-2bb3a3afed119eed575eeeaf","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-10df520805b6bb67b2527b15","type":"p","scope":"block-d4372ab8df884c7e9001495510cf38ac","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-10df520805b6bb67b2527b15","content":"**到此停一下：** 如果所有框都准确了，我们是否已经知道每一个杯子把手的像素边界？下面从另一个问题出发，不把 FCN 排成 Faster R-CNN 的下一版。","sha256":"c3c8933178e11ad668ec0f0b8b7b1b95050ef1b88e5bc16435473966fcef57ca","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-d4372ab8df884c7e9001495510cf38ac","title":"Faster R-CNN：让候选也由特征提出","number":5},"sectionTitle":"Faster R-CNN：让候选也由特征提出","currentQuestion":"Faster R-CNN：让候选也由特征提出","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-eb240fd7361c46fcc3f56f05","nextBlock":null,"prerequisites":[{"id":"b-21b8a2d0ad2acb451566d8e6","url":"#b-21b8a2d0ad2acb451566d8e6","role":"section-title"},{"id":"b-2bb3a3afed119eed575eeeaf","url":"#b-2bb3a3afed119eed575eeeaf","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-2032da6248c1036b128fb137","type":"h3","scope":"block-7a7522255a9a4acc87acfbf8ab9d33aa","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-2032da6248c1036b128fb137","content":"### 3. FCN：直接问每个位置属于哪一类","sha256":"2e763361c071d020424939ff43a5c3a4ab7ce9cb749a88ae077ab3c93fa075ab","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","title":"3. FCN：直接问每个位置属于哪一类","number":6},"sectionTitle":"3. FCN：直接问每个位置属于哪一类","currentQuestion":"3. FCN：直接问每个位置属于哪一类","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-d45ade1c7bba7de5fd33809c","prerequisites":[{"id":"b-d45ade1c7bba7de5fd33809c","url":"#b-d45ade1c7bba7de5fd33809c","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-d45ade1c7bba7de5fd33809c","type":"p","scope":"block-e07a99e024e54a96b95494f93248d35f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-d45ade1c7bba7de5fd33809c","content":"FCN 从密集像素预测出发。网络在整个图像上产生类别分数图，再恢复到与输入相对应的输出尺度。深层特征容易汇聚较大范围的语义信息，但空间网格较粗；较浅层保留更细的位置线索。跳跃连接把这些层次的线索结合起来。[FCN](https://arxiv.org/abs/1411.4038)","sha256":"c4495cfa2bc9337007b9041d1f1c21ec4758b4e475f79bd830a80212b304b991","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","title":"3. FCN：直接问每个位置属于哪一类","number":6},"sectionTitle":"3. FCN：直接问每个位置属于哪一类","currentQuestion":"3. FCN：直接问每个位置属于哪一类","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-2032da6248c1036b128fb137","nextBlock":"b-f6b5d544ee691fed02665bcc","prerequisites":[{"id":"b-2032da6248c1036b128fb137","url":"#b-2032da6248c1036b128fb137","role":"section-title"}],"relatedBlocks":[]},{"id":"b-f6b5d544ee691fed02665bcc","type":"p","scope":"block-e07a99e024e54a96b95494f93248d35f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-f6b5d544ee691fed02665bcc","content":"对于两只杯子，语义分割可以把它们都标为“杯子”。然而一块连通的杯子像素既可能是一只宽杯，也可能是两只相接的杯子。类别值本身不规定实例数量。","sha256":"f7a35b191037a3d4ce1a0380354829523a6771e8f0f817b75d9680684ce80630","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","title":"3. FCN：直接问每个位置属于哪一类","number":6},"sectionTitle":"3. FCN：直接问每个位置属于哪一类","currentQuestion":"3. FCN：直接问每个位置属于哪一类","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-d45ade1c7bba7de5fd33809c","nextBlock":"b-b5e1e21918abb357539ba5aa","prerequisites":[{"id":"b-2032da6248c1036b128fb137","url":"#b-2032da6248c1036b128fb137","role":"section-title"},{"id":"b-d45ade1c7bba7de5fd33809c","url":"#b-d45ade1c7bba7de5fd33809c","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b5e1e21918abb357539ba5aa","type":"p","scope":"block-e07a99e024e54a96b95494f93248d35f","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-b5e1e21918abb357539ba5aa","content":"因此有两条问题线：**区域路线组织“哪些对象”与框；密集路线组织“哪些像素”与类别。** 它们可以汇合，但不是沿一条箭头依次淘汰。","sha256":"577437aff921fbc4647e84807f5595582e274dea1f87371f95b51589c0894d0c","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-7a7522255a9a4acc87acfbf8ab9d33aa","title":"3. FCN：直接问每个位置属于哪一类","number":6},"sectionTitle":"3. FCN：直接问每个位置属于哪一类","currentQuestion":"3. FCN：直接问每个位置属于哪一类","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-f6b5d544ee691fed02665bcc","nextBlock":null,"prerequisites":[{"id":"b-2032da6248c1036b128fb137","url":"#b-2032da6248c1036b128fb137","role":"section-title"},{"id":"b-d45ade1c7bba7de5fd33809c","url":"#b-d45ade1c7bba7de5fd33809c","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-8932a00ff93bc993bf5cc1bd","type":"h3","scope":"block-12a787367f384e0488a579b23fda1697","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-8932a00ff93bc993bf5cc1bd","content":"### Mask R-CNN：在每个对象区域内预测掩码","sha256":"dc05eba83709d1f2c0985d6db940e5103d6582e3fb39bd9ebd978e12296733f3","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-12a787367f384e0488a579b23fda1697","title":"Mask R-CNN：在每个对象区域内预测掩码","number":7},"sectionTitle":"Mask R-CNN：在每个对象区域内预测掩码","currentQuestion":"Mask R-CNN：在每个对象区域内预测掩码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-be7b870cc6d24ce6e782d3b2","prerequisites":[{"id":"b-be7b870cc6d24ce6e782d3b2","url":"#b-be7b870cc6d24ce6e782d3b2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-be7b870cc6d24ce6e782d3b2","type":"p","scope":"block-12a787367f384e0488a579b23fda1697","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-be7b870cc6d24ce6e782d3b2","content":"Mask R-CNN 保留检测的区域组织，再为每个区域增加一个像素掩码分支。区域分类/框回归回答对象是什么、在哪里；掩码分支回答该区域中哪些位置属于这个实例。[Mask R-CNN](https://arxiv.org/abs/1703.06870)","sha256":"4315899214ace3122af7837a92b12cef47f61220095734ec4dd0e19a7fbe226c","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-12a787367f384e0488a579b23fda1697","title":"Mask R-CNN：在每个对象区域内预测掩码","number":7},"sectionTitle":"Mask R-CNN：在每个对象区域内预测掩码","currentQuestion":"Mask R-CNN：在每个对象区域内预测掩码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8932a00ff93bc993bf5cc1bd","nextBlock":"b-a8d029d73ed007e323ff6317","prerequisites":[{"id":"b-8932a00ff93bc993bf5cc1bd","url":"#b-8932a00ff93bc993bf5cc1bd","role":"section-title"}],"relatedBlocks":[]},{"id":"b-a8d029d73ed007e323ff6317","type":"p","scope":"block-12a787367f384e0488a579b23fda1697","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-a8d029d73ed007e323ff6317","content":"若杯一与杯二同属杯子，类别相同也能有两张分别属于它们的掩码。训练要求有对应实例的像素标注；主干可复用，但区域内的精细输出不是只换一个名称就自动出现。","sha256":"fbe4d1e5608e40faeeb35a3c3975873092abf1175971bc88762ea0bf790b501b","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-12a787367f384e0488a579b23fda1697","title":"Mask R-CNN：在每个对象区域内预测掩码","number":7},"sectionTitle":"Mask R-CNN：在每个对象区域内预测掩码","currentQuestion":"Mask R-CNN：在每个对象区域内预测掩码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-be7b870cc6d24ce6e782d3b2","nextBlock":"b-06b3262e54d89347dbe00ddc","prerequisites":[{"id":"b-8932a00ff93bc993bf5cc1bd","url":"#b-8932a00ff93bc993bf5cc1bd","role":"section-title"},{"id":"b-be7b870cc6d24ce6e782d3b2","url":"#b-be7b870cc6d24ce6e782d3b2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-06b3262e54d89347dbe00ddc","type":"p","scope":"block-12a787367f384e0488a579b23fda1697","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-06b3262e54d89347dbe00ddc","content":"这时我们碰到新的敏感点：分类可能容忍区域平移一点，逐像素边界却可能因此错一排。**边界错了，是读取时发生错位，还是表示里没有留下足够信息？** 先看读取。","sha256":"78096848c14e7d043d51b8dc0088a2123db4de3a5230dc9463f4142ec443f6f7","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-12a787367f384e0488a579b23fda1697","title":"Mask R-CNN：在每个对象区域内预测掩码","number":7},"sectionTitle":"Mask R-CNN：在每个对象区域内预测掩码","currentQuestion":"Mask R-CNN：在每个对象区域内预测掩码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a8d029d73ed007e323ff6317","nextBlock":null,"prerequisites":[{"id":"b-8932a00ff93bc993bf5cc1bd","url":"#b-8932a00ff93bc993bf5cc1bd","role":"section-title"},{"id":"b-be7b870cc6d24ce6e782d3b2","url":"#b-be7b870cc6d24ce6e782d3b2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-66ecefe0504e46c31912ad18","type":"h3","scope":"block-59f854c8485e42708eabc7fc8ba1b9ee","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-66ecefe0504e46c31912ad18","content":"### 4. 对齐：把连续位置准确交给现有特征图","sha256":"2e87794226804507619bf969cd5e820a00c844e3035b041ef7d85a150bec2585","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-78dfe963fc2a706764e49e63","prerequisites":[{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-78dfe963fc2a706764e49e63","type":"p","scope":"block-e250e45b554d43039064b9da4f55183e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-78dfe963fc2a706764e49e63","content":"RoIAlign 的正面作用，是保留连续区域位置，在已有特征图上做采样，减少取整造成的区域错位。","sha256":"428933cde02fcd188c5af97a769c87d3ea97224faf664f121e9acd426b609f77","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-66ecefe0504e46c31912ad18","nextBlock":"b-e062f08142ae19fb87f7b0dd","prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"}],"relatedBlocks":[]},{"id":"b-e062f08142ae19fb87f7b0dd","type":"p","scope":"block-e250e45b554d43039064b9da4f55183e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-e062f08142ae19fb87f7b0dd","content":"约定原图坐标与特征坐标满足 `u=x/stride`，不引入像素中心额外偏移。若 x=35、stride=16，则 u=2.1875。它位于特征索引 2 与 3 之间，距离左邻为 0.1875。给定两个邻居值 2 与 6：","sha256":"a8d0554a4b724ae5885ad7712a40d52607411e7ccc7607c7c7399c7baa86d80b","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-78dfe963fc2a706764e49e63","nextBlock":"b-66bdeff47c8133239087d853","prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"},{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-66bdeff47c8133239087d853","type":"p","scope":"block-e250e45b554d43039064b9da4f55183e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-66bdeff47c8133239087d853","content":"$v=(1-0.1875)\\times 2+0.1875\\times 6=2.75.$","sha256":"e286a1a550e5ac7f30392f8844555a7b565c076a33a00b4845dd8fa98e07d0d0","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[{"latex":"v=(1-0.1875)\\times 2+0.1875\\times 6=2.75.","definitionContext":"4. 对齐：把连续位置准确交给现有特征图"}],"previousBlock":"b-e062f08142ae19fb87f7b0dd","nextBlock":"b-b8cdf4e66c8dad44d53df67d","prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"},{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b8cdf4e66c8dad44d53df67d","type":"p","scope":"block-e250e45b554d43039064b9da4f55183e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-b8cdf4e66c8dad44d53df67d","content":"若先把位置取成 2，读取值会是 2，连续位移的影响被丢掉了。真实 RoIAlign 在二维区域的网格中采样，使用双线性插值并聚合；这里的一维例子只隔离连续位置怎样影响读数。","sha256":"56db1e61b00c066c49888dc0cf11a0672a5b5f615447ceab22addd3aac902ea9","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-66bdeff47c8133239087d853","nextBlock":"b-63697f97b9e33b9ea1ae61e7","prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"},{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-63697f97b9e33b9ea1ae61e7","type":"p","scope":"block-e250e45b554d43039064b9da4f55183e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-63697f97b9e33b9ea1ae61e7","content":"**先预测：** 将 x 改为 36，读数是否连续变化？把 stride 改成 8 时，还能沿用特征索引 2、3 的这两个数吗？坐标约定与特征值必须一起明确。","sha256":"65bd58535f055b29f19b0932d12ba8bf5af8f869114e38372c5648dbfda40e5c","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-b8cdf4e66c8dad44d53df67d","nextBlock":"b-c3196b80fd767bb556ba3fab","prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"},{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-c3196b80fd767bb556ba3fab","type":"pre","scope":"block-4296199189944332aa0e7d0ed0d6a2dc","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-c3196b80fd767bb556ba3fab","content":"```\n# 独立一维采样练习；不等同于完整二维 RoIAlign。\nimport math\nfeature = [0.0,1.0,2.0,6.0,7.0]\nstride = 16.0\nfor x in [32.0,35.0,36.0,40.0,48.0]:\n    u = x/stride\n    lo = math.floor(u); hi = min(lo+1,len(feature)-1)\n    alpha = u-lo\n    v = (1-alpha)*feature[lo]+alpha*feature[hi]\n    print(f'原图x={x:g}, 特征u={u:g}, 左邻={lo}, 插值={v:g}')\nassert math.isclose((1-0.1875)*2+0.1875*6,2.75)\n```","sha256":"74f6c801871ab4f57344e84fd4bf08f6a85b501135e90d633f7a5247d66f09f0","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-59f854c8485e42708eabc7fc8ba1b9ee","title":"4. 对齐：把连续位置准确交给现有特征图","number":8},"sectionTitle":"4. 对齐：把连续位置准确交给现有特征图","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-63697f97b9e33b9ea1ae61e7","nextBlock":null,"prerequisites":[{"id":"b-66ecefe0504e46c31912ad18","url":"#b-66ecefe0504e46c31912ad18","role":"section-title"},{"id":"b-78dfe963fc2a706764e49e63","url":"#b-78dfe963fc2a706764e49e63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-475c00b5ad2acbed61549722","type":"h3","scope":"block-9a6ef95fe6b34b36b77f310ca2c04aa9","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-475c00b5ad2acbed61549722","content":"### 5. 信息没留下，放大网格能找回来吗？","sha256":"28879a9fb74cdb37b2a545c11011cdc1a7bd70f891679ac460475235141aac71","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-bce0ff0d79d5b14e1bf5855e","prerequisites":[{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-bce0ff0d79d5b14e1bf5855e","type":"p","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-bce0ff0d79d5b14e1bf5855e","content":"看正式问卷使用的两幅小图：","sha256":"863e1dd240e7f07f37c886dbe0ea146239d2e398372d2fa52a23acc83cbf87cf","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-475c00b5ad2acbed61549722","nextBlock":"b-0ba492d32fc7f594c0fcd53e","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"}],"relatedBlocks":[]},{"id":"b-0ba492d32fc7f594c0fcd53e","type":"ul","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-0ba492d32fc7f594c0fcd53e","content":"- 甲：`[[1,0],[1,0]]`，左列为 1。\n\n- 乙：`[[0,1],[0,1]]`，右列为 1。","sha256":"85b70e0efc2a955752791379515eb9c4d5ab5c44f0f1efe72c79a9223462abc2","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-bce0ff0d79d5b14e1bf5855e","nextBlock":"b-dae42c5e3659adec91ce4a26","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-dae42c5e3659adec91ce4a26","type":"li","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-dae42c5e3659adec91ce4a26","content":"- 甲：`[[1,0],[1,0]]`，左列为 1。","sha256":"80762b6a6d52f4eb45dc142aad3e903a38666c97acd8dc60225546389e97d69b","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-0ba492d32fc7f594c0fcd53e","nextBlock":"b-8546f315c4959a7c1fae21c8","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-8546f315c4959a7c1fae21c8","type":"li","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-8546f315c4959a7c1fae21c8","content":"- 乙：`[[0,1],[0,1]]`，右列为 1。","sha256":"5fa9bc5cf35e392a55457c3ad1fc84964860f8152b9671869ee2f531f75180cc","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-dae42c5e3659adec91ce4a26","nextBlock":"b-68fee5e3d925b55e6fced3d6","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-68fee5e3d925b55e6fced3d6","type":"p","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-68fee5e3d925b55e6fced3d6","content":"若编码器只留下一个均值，两幅都成为 0.5。现在规定其余特征与框也相同，后续不能回看原图。读取器收到完全相同的输入，无论怎样插值或放大，都没有依据对二者作出不同判断。","sha256":"64797818bd83af7750b0cb4d9adc3a9363126cd5f94d652bf6d76f1fc52897f8","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8546f315c4959a7c1fae21c8","nextBlock":"b-958e1fc43095eb6e9b564204","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-958e1fc43095eb6e9b564204","type":"p","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-958e1fc43095eb6e9b564204","content":"这不是说所有低分辨率特征都不能表达边界。给同样一个空间格子增加通道 `左列均值−右列均值`，甲得到 +1、乙得到 −1。网格大小没变，却有了可区分信息。","sha256":"53b32791c4ea43835b81b123176b6b3aea5f9c6f4dee70cbc7010e2666e9ba7d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-68fee5e3d925b55e6fced3d6","nextBlock":"b-36c2f305aba7da016bde152a","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-36c2f305aba7da016bde152a","type":"table","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-36c2f305aba7da016bde152a","content":"| 表示 | 甲 | 乙 | 读取器有区别可用吗？ |\n| --- | --- | --- | --- |\n| 全图均值 | 0.5 | 0.5 | 没有 |\n| 均值＋左右差 | (0.5,+1) | (0.5,−1) | 有 |","sha256":"3f794df3969648c97acb779e523ba8e7015124b6f6676e8fe637418ee9c2b038","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"table":{"headers":["表示","甲","乙","读取器有区别可用吗？"],"rows":[["表示","甲","乙","读取器有区别可用吗？"],["全图均值","0.5","0.5","没有"],["均值＋左右差","(0.5,+1)","(0.5,−1)","有"]]},"previousBlock":"b-958e1fc43095eb6e9b564204","nextBlock":"b-83de197e48e556e81b42f24c","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-83de197e48e556e81b42f24c","type":"p","scope":"block-33bfeb7dd6094665b5679a28be52c251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-83de197e48e556e81b42f24c","content":"**先预测：** 对一张真正训练出来的粗特征图，单凭“网格很粗”能断言左右信息必定丢失吗？应检查特征与读出行为，而不能只看张量外形。","sha256":"b64b0bb3ae2080d3245f63a1ff3f384755dd0696b6b0cdf3385b579779cfb3a2","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-36c2f305aba7da016bde152a","nextBlock":"b-b6922f91a529cf8061a029bb","prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b6922f91a529cf8061a029bb","type":"pre","scope":"block-f875004afbdc40f28e971ad3eafb9769","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-b6922f91a529cf8061a029bb","content":"```\n# 独立 CPU 练习：表示碰撞与新增通道。\nA = [[1.0,0.0],[1.0,0.0]]\nB = [[0.0,1.0],[0.0,1.0]]\ndef encode(matrix):\n    mean = sum(map(sum,matrix))/4\n    left_minus_right = sum(row[0] for row in matrix)/2-sum(row[1] for row in matrix)/2\n    return mean,left_minus_right\nfa,fb = encode(A),encode(B)\nassert fa[0]==fb[0]==0.5\nassert fa==(0.5,1.0) and fb==(0.5,-1.0)\nfor label,matrix in [('甲',A),('乙',B)]:\n    average,side = encode(matrix)\n    enlarged = [[average]*4 for _ in range(4)]\n    print(label,'只留均值:',average,'放大后首行:',enlarged[0], '新增左右差:',side)\nprint('同一个均值放大后仍相同；差别来自编码时保存了新的通道。')\n```","sha256":"b1bd03e79cc5bb9835393d1cc7310cde4635979e1704d3fcb1ee99ccc811225d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-9a6ef95fe6b34b36b77f310ca2c04aa9","title":"5. 信息没留下，放大网格能找回来吗？","number":9},"sectionTitle":"5. 信息没留下，放大网格能找回来吗？","currentQuestion":"5. 信息没留下，放大网格能找回来吗？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-83de197e48e556e81b42f24c","nextBlock":null,"prerequisites":[{"id":"b-475c00b5ad2acbed61549722","url":"#b-475c00b5ad2acbed61549722","role":"section-title"},{"id":"b-bce0ff0d79d5b14e1bf5855e","url":"#b-bce0ff0d79d5b14e1bf5855e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-87824fe1290e0e3530c69f33","type":"h3","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-87824fe1290e0e3530c69f33","content":"### 回到真实训练：对齐为什么值得修复","sha256":"f0936066f68628916925f16edf1dce043f77623c4b72dcb54e352fd1c993a788","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-47fb73508f756448d3c0a836","prerequisites":[{"id":"b-47fb73508f756448d3c0a836","url":"#b-47fb73508f756448d3c0a836","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-47fb73508f756448d3c0a836","type":"p","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-47fb73508f756448d3c0a836","content":"Mask R-CNN v3 的 Table 2 使用 COCO `trainval35k` 训练、`minival` 测试；表中未另说明时报告 mask AP。以下固定 ResNet-50-C4、stride 16，并选同为 max 聚合的行：","sha256":"3bb8d279d8595e2246936d624e3b4edea6ceca91fece02cd289fada770a219f4","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-87824fe1290e0e3530c69f33","nextBlock":"b-e652a9cb67eb772d30f1ca01","prerequisites":[{"id":"b-87824fe1290e0e3530c69f33","url":"#b-87824fe1290e0e3530c69f33","role":"section-title"}],"relatedBlocks":[]},{"id":"b-e652a9cb67eb772d30f1ca01","type":"table","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-e652a9cb67eb772d30f1ca01","content":"| 区域读取 | 是否保留对齐 | 是否双线性 | mask AP | mask AP75 |\n| --- | --- | --- | --- | --- |\n| RoIPool | 否 | 否 | 26.9 | 26.4 |\n| RoIWarp | 否 | 是 | 27.2 | 27.1 |\n| RoIAlign | 是 | 是 | 30.2 | 31.8 |","sha256":"f59df6ce113db0faf2717e5b8440d85ef1f069b2e8b327b430459828cfd41119","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"table":{"headers":["区域读取","是否保留对齐","是否双线性","mask AP","mask AP75"],"rows":[["区域读取","是否保留对齐","是否双线性","mask AP","mask AP75"],["RoIPool","否","否","26.9","26.4"],["RoIWarp","否","是","27.2","27.1"],["RoIAlign","是","是","30.2","31.8"]]},"previousBlock":"b-47fb73508f756448d3c0a836","nextBlock":"b-d32f2e7203dd75e6e16286cc","prerequisites":[{"id":"b-87824fe1290e0e3530c69f33","url":"#b-87824fe1290e0e3530c69f33","role":"section-title"},{"id":"b-47fb73508f756448d3c0a836","url":"#b-47fb73508f756448d3c0a836","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-d32f2e7203dd75e6e16286cc","type":"p","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-d32f2e7203dd75e6e16286cc","content":"RoIAlign 相比 RoIPool 的 AP 增加 3.3 点，AP75 增加 5.4 点。RoIWarp 也插值却没有同样改善，支持“保持坐标对应”这一机制判断。平均聚合的 RoIAlign 行是 AP30.3/AP75 31.5，引用时不能把不同聚合行混在一个对照里。Table 2(d) 换成 C5、stride32，mask AP 从 23.6 到 30.9；这是另一组设置。","sha256":"4cdba8cde1b8262a042dd6aa8cda6abe7fd5a4e8cb6f224f5bb95e0f3611cd8d","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-e652a9cb67eb772d30f1ca01","nextBlock":"b-1ac7a5c0e7ad25db9f46aa80","prerequisites":[{"id":"b-87824fe1290e0e3530c69f33","url":"#b-87824fe1290e0e3530c69f33","role":"section-title"},{"id":"b-47fb73508f756448d3c0a836","url":"#b-47fb73508f756448d3c0a836","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-1ac7a5c0e7ad25db9f46aa80","type":"p","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-1ac7a5c0e7ad25db9f46aa80","content":"这些是训练完整模型的论文结果，不是本课程重跑。它们说明读取位置值得修复，尤其严格定位受益；P44 则把输入 F 固定成完全相同，讨论任何确定性读出都无法创造差别。方法有效与构造例中的信息限制，可以同时成立。","sha256":"a75c59c916a80252869b500277c7120d64fcb5056b16b7893076a6f49e7c3632","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-d32f2e7203dd75e6e16286cc","nextBlock":"b-3a594b0bac2b1277ecc2f513","prerequisites":[{"id":"b-87824fe1290e0e3530c69f33","url":"#b-87824fe1290e0e3530c69f33","role":"section-title"},{"id":"b-47fb73508f756448d3c0a836","url":"#b-47fb73508f756448d3c0a836","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-3a594b0bac2b1277ecc2f513","type":"p","scope":"block-20ee5eb6f2da43b784c77a32e9ca12d7","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-3a594b0bac2b1277ecc2f513","content":"[原论文 Table 2](https://arxiv.org/html/1703.06870v3#S4.SS2) · [备课模拟追问：论文与信息碰撞为什么不矛盾](/course/blocks/roi-information-dialogue.html)","sha256":"2cdf08a58cb22b63b3f0dc0f683f633279484efbb6c1a8e2e4c9f110169c86c9","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-20ee5eb6f2da43b784c77a32e9ca12d7","title":"回到真实训练：对齐为什么值得修复","number":10},"sectionTitle":"回到真实训练：对齐为什么值得修复","currentQuestion":"回到真实训练：对齐为什么值得修复","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-1ac7a5c0e7ad25db9f46aa80","nextBlock":null,"prerequisites":[{"id":"b-87824fe1290e0e3530c69f33","url":"#b-87824fe1290e0e3530c69f33","role":"section-title"},{"id":"b-47fb73508f756448d3c0a836","url":"#b-47fb73508f756448d3c0a836","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-79f56c43aae39029282dc1fa","type":"h3","scope":"block-58f9ec0b8a46438ea54c09154c54ddf4","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-79f56c43aae39029282dc1fa","content":"### 6. 活动：类别图与实例图怎样不同？","sha256":"5e5a1a7ea48b445ba9600de63532fa821f57bc541c390a03b88e3f186ff79aee","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","title":"6. 活动：类别图与实例图怎样不同？","number":11},"sectionTitle":"6. 活动：类别图与实例图怎样不同？","currentQuestion":"6. 活动：类别图与实例图怎样不同？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-01f8407d6f648d890dee863d","prerequisites":[{"id":"b-01f8407d6f648d890dee863d","url":"#b-01f8407d6f648d890dee863d","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-01f8407d6f648d890dee863d","type":"p","scope":"block-81854aba012c40cd957e12cbb4bbd008","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-01f8407d6f648d890dee863d","content":"下面用一个小型教学网格表示两只杯子与一本书，独立于上方照片的人工轮廓。`0` 是背景，`1/2` 是杯一/杯二，`3` 是书。两只杯子在中间相接；实例图仍保留两个身份。","sha256":"98a121d6c2ec657d35f6ad37c3572879756014fb06ae37f74a55f4b3a2937f27","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","title":"6. 活动：类别图与实例图怎样不同？","number":11},"sectionTitle":"6. 活动：类别图与实例图怎样不同？","currentQuestion":"6. 活动：类别图与实例图怎样不同？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-79f56c43aae39029282dc1fa","nextBlock":"b-99a3068c46d0715f6e089f47","prerequisites":[{"id":"b-79f56c43aae39029282dc1fa","url":"#b-79f56c43aae39029282dc1fa","role":"section-title"}],"relatedBlocks":[]},{"id":"b-99a3068c46d0715f6e089f47","type":"p","scope":"block-81854aba012c40cd957e12cbb4bbd008","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-99a3068c46d0715f6e089f47","content":"把实例 1 与 2 都映射为类别“杯子”后，语义图保留杯子整体区域，丢掉二者的身份差别。框则只记录每个实例出现的最小矩形范围，不保存矩形内部哪些格子为空。","sha256":"4bdb5b299368f73f1edf5f386d95ee6ac712a8d2fb34d8e7402393ba7ab7c379","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","title":"6. 活动：类别图与实例图怎样不同？","number":11},"sectionTitle":"6. 活动：类别图与实例图怎样不同？","currentQuestion":"6. 活动：类别图与实例图怎样不同？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-01f8407d6f648d890dee863d","nextBlock":"b-cd882914f3d0734c36a5f740","prerequisites":[{"id":"b-79f56c43aae39029282dc1fa","url":"#b-79f56c43aae39029282dc1fa","role":"section-title"},{"id":"b-01f8407d6f648d890dee863d","url":"#b-01f8407d6f648d890dee863d","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-cd882914f3d0734c36a5f740","type":"p","scope":"block-81854aba012c40cd957e12cbb4bbd008","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-cd882914f3d0734c36a5f740","content":"**先预测：** 如果两个杯子的语义区域连在一起，仅凭语义图能唯一确定原来的分界吗？运行下格，比较 `instance`、`semantic` 和 `boxes`，再改变一个格子。静态读者可直接用这一解释：类别映射是多对一；两个不同实例图可以得到同一语义图。","sha256":"e94ed81106e2b429171f16434f32eb6c393f2620343caf5c55a2fa150a668985","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","title":"6. 活动：类别图与实例图怎样不同？","number":11},"sectionTitle":"6. 活动：类别图与实例图怎样不同？","currentQuestion":"6. 活动：类别图与实例图怎样不同？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-99a3068c46d0715f6e089f47","nextBlock":"b-0cc775fbcf574449a2a04e4e","prerequisites":[{"id":"b-79f56c43aae39029282dc1fa","url":"#b-79f56c43aae39029282dc1fa","role":"section-title"},{"id":"b-01f8407d6f648d890dee863d","url":"#b-01f8407d6f648d890dee863d","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-0cc775fbcf574449a2a04e4e","type":"pre","scope":"block-a77753adddda4578b9601eba650283c3","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-0cc775fbcf574449a2a04e4e","content":"```\n# 独立 CPU 教学标签网格；不是照片真值或检测模型输出。\ninstance = [\n [0,0,0,0,0,0,0,0],\n [0,1,1,2,2,0,0,0],\n [0,1,1,2,2,0,0,0],\n [0,1,1,2,2,0,0,0],\n [0,0,0,0,3,3,3,0],\n [0,0,0,0,3,3,3,0]]\nclass_of = {0:0,1:1,2:1,3:2} # 类别0背景，1杯子，2书\nsemantic = [[class_of[x] for x in row] for row in instance]\nboxes = {}\nfor identity in [1,2,3]:\n    coordinates=[(r,c) for r,row in enumerate(instance) for c,x in enumerate(row) if x==identity]\n    rows,cols=zip(*coordinates)\n    boxes[identity]=(min(cols),min(rows),max(cols)+1,max(rows)+1)\nprint('实例图:'); [print(row) for row in instance]\nprint('语义图:'); [print(row) for row in semantic]\nprint('框(x0,y0,x1,y1；右/下边界不含):',boxes)\nassert semantic[1][2]==semantic[1][3]==1\nassert instance[1][2]!=instance[1][3]\n```","sha256":"97c6ebeeb2c6145e77f6ee50a38a0c718cf6a9716c5cb81ef7e2d329dbdc61b0","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-58f9ec0b8a46438ea54c09154c54ddf4","title":"6. 活动：类别图与实例图怎样不同？","number":11},"sectionTitle":"6. 活动：类别图与实例图怎样不同？","currentQuestion":"6. 活动：类别图与实例图怎样不同？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-cd882914f3d0734c36a5f740","nextBlock":null,"prerequisites":[{"id":"b-79f56c43aae39029282dc1fa","url":"#b-79f56c43aae39029282dc1fa","role":"section-title"},{"id":"b-01f8407d6f648d890dee863d","url":"#b-01f8407d6f648d890dee863d","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-3b08b1270363e0e1e9f8a735","type":"h3","scope":"block-673e073110a3452fbc7257bc532e6383","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-3b08b1270363e0e1e9f8a735","content":"### 7. SAM：点一下，这次要处理哪一个？","sha256":"4674434284071bd4a08f28cd90248b95e620966254e460bd13c7190888871f5e","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-673e073110a3452fbc7257bc532e6383","title":"7. SAM：点一下，这次要处理哪一个？","number":12},"sectionTitle":"7. SAM：点一下，这次要处理哪一个？","currentQuestion":"7. SAM：点一下，这次要处理哪一个？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":null,"prerequisites":[],"relatedBlocks":[]},{"id":"b-09e2dc5f56312617f2b87d76","type":"h3","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-09e2dc5f56312617f2b87d76","content":"### 提示指定本次目标，训练学会响应提示","sha256":"3ab20d98377f7bd830665ddf2191c129c9192d1d9313152bc1c5b443cd62973a","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-0d351e7ff98ab177209fe261","prerequisites":[{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-0d351e7ff98ab177209fe261","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-0d351e7ff98ab177209fe261","content":"在杯柄上给一个正点，并不唯一规定目标是杯柄、整只杯子还是更大的对象组合。提示式分割的任务是根据图像与提示返回合理 mask；提示增加信息，但不必天然消除所有歧义。","sha256":"56e7c036b4f4f45007a9bb867592b5303af825844c50e015a082b7a5ff5f8446","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-09e2dc5f56312617f2b87d76","nextBlock":"b-83ff759cdb37a489a631b42a","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"}],"relatedBlocks":[]},{"id":"b-83ff759cdb37a489a631b42a","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-83ff759cdb37a489a631b42a","content":"几何提示可以分工：正点表示希望包含的位置，负点表示希望排除的位置，框给出大致区域，已有 mask 可以作为进一步修正的输入。它们不是人工直接提供完整答案，却约束了本次想处理的对象。模型须结合图像线索填出边界。","sha256":"b4fc40a21ed69c43b6d314267ce3e4c2d4c5b7ac80bea0111de8c7fdda89c3ae","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-0d351e7ff98ab177209fe261","nextBlock":"b-a8d89f3029827f53e5406c16","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-a8d89f3029827f53e5406c16","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-a8d89f3029827f53e5406c16","content":"原始 SAM 将图像编码、提示编码和 mask 解码分开。同一图像的较重表示可缓存，用户改点、改框时重复较轻的后半段。它也能为模糊提示给出多个 mask 与估计质量，从而容纳“部分还是整体”的不同解释。","sha256":"0477ef728ef80f0e9c50f2e6e04b9240e3247b8ec2e7d94d69df73c5cb655bef","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-83ff759cdb37a489a631b42a","nextBlock":"b-056a38c98a01ae6565e7a9a5","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-056a38c98a01ae6565e7a9a5","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-056a38c98a01ae6565e7a9a5","content":"本页教学图显示提示与目标的对应关系；若要评价模型，应保存真正返回的 mask，并先约定期望的对象粒度。用户给一个点后显示手工真值，不能替代推理证据。LAB 16 目前保留的是确定性颜色/连通域规则，适合比较接口，不冒充 SAM 权重推理。","sha256":"3ab59c7ac0c844366f525ff129aa8a1133bc3f0501d18d73a801db127544fa1e","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a8d89f3029827f53e5406c16","nextBlock":"b-585b42eb3a0fae316ac42993","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-585b42eb3a0fae316ac42993","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-585b42eb3a0fae316ac42993","content":"原始 SAM 的图像编码器使用 MAE 预训练初始化。这连接了第一部分的表示学习，但“遮挡重建”目标并没有直接提供“某个正点应对应哪个对象 mask”的全部监督。后续还要进行提示式分割训练。","sha256":"d81be8895ad7921895d1f461f04b87ae6a1812cacfdfd8bae29397181d035b00","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-056a38c98a01ae6565e7a9a5","nextBlock":"b-7114dd9916e9b78257b2d4d2","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-7114dd9916e9b78257b2d4d2","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-7114dd9916e9b78257b2d4d2","content":"训练样本包含图像、目标 mask 与模拟提示。模型预测后，可以从错误区域追加正点或负点，再要求它修正；原论文训练模拟每个 mask 的多轮交互，掩码损失组合 focal 与 dice。这样，推理时的“改点、改框”对应训练中学过的任务，而不是凭空获得一个通用按钮。","sha256":"67b3d3c3aad52c0d80e2601a93b15e852b3304b341f8f30e0eaa71ce59012241","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-585b42eb3a0fae316ac42993","nextBlock":"b-54766329d21e5a8505fbe829","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-54766329d21e5a8505fbe829","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-54766329d21e5a8505fbe829","content":"数据组织也属于能力来源。SA-1B 来自模型辅助标注、半自动补充、全自动生成的逐步演进，最终收集约 1100 万张图像与 11 亿个 mask。这里的数据单位是区域轮廓，并非现成的图文语句对。","sha256":"288b13fb11a7b4bf50ae1b07b0d59fe594cb1b283e580e44cb03d1c60f4dcdf6","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-7114dd9916e9b78257b2d4d2","nextBlock":"b-b3cd1cae470a90232e39056b","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b3cd1cae470a90232e39056b","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-b3cd1cae470a90232e39056b","content":"预训练参数、任务监督和使用接口可以分别复用：先以自监督表示为起点，再学习图像/提示到掩码，使用时缓存同图表示。如果只说“MAE 会补图所以自然会分割”，就跳过了任务训练这一关键桥梁。注意此处是原始 SAM；文字提示在论文中有另行探索，不等于公开几何提示 checkpoint 默认已具备任意语言理解。","sha256":"d09830d2ab723a8ef4a85da99e5bb96bc3f95fcd6e26eeaad7e1b354c766da11","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-54766329d21e5a8505fbe829","nextBlock":"b-2ac33ab79570e42384f05b0b","prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-2ac33ab79570e42384f05b0b","type":"p","scope":"block-fd0dc77671064e8ab452f36d817bc71b","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-2ac33ab79570e42384f05b0b","content":"[LAB 16 规则基线的准确身份](/course/blocks/sam-rule-baseline-explained.html) · [原始 SAM §2–4](https://arxiv.org/html/2304.02643v1)","sha256":"70f0ee38f06f5c83fff8021ab80296be4bd08fb7eee85c5e76b690e4a5f0e055","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd0dc77671064e8ab452f36d817bc71b","title":"提示指定本次目标，训练学会响应提示","number":13},"sectionTitle":"提示指定本次目标，训练学会响应提示","currentQuestion":"提示指定本次目标，训练学会响应提示","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-b3cd1cae470a90232e39056b","nextBlock":null,"prerequisites":[{"id":"b-09e2dc5f56312617f2b87d76","url":"#b-09e2dc5f56312617f2b87d76","role":"section-title"},{"id":"b-0d351e7ff98ab177209fe261","url":"#b-0d351e7ff98ab177209fe261","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-28bddb9d1237654a380ce38f","type":"h3","scope":"block-fd2927a7e00c404ab41726f122010251","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-28bddb9d1237654a380ce38f","content":"### 8. 从空间提示，走向语言指定","sha256":"f3123c63769662888ad5022744850e1ea5b0de72fe4b1ed8cfe39c5ea0a921b0","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-fd2927a7e00c404ab41726f122010251","title":"8. 从空间提示，走向语言指定","number":14},"sectionTitle":"8. 从空间提示，走向语言指定","currentQuestion":"8. 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课后先选一条路","sha256":"b200d9fc1f2400ecd2a1397d855c1c91b56c5bcfe78a2198754db5a63579e2a5","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-6b8197023f3c4157bbcb484c8154751e","title":"课后先选一条路","number":15},"sectionTitle":"课后先选一条路","currentQuestion":"课后先选一条路","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-7a3d393c53ca3481f5b5e8e1","prerequisites":[{"id":"b-7a3d393c53ca3481f5b5e8e1","url":"#b-7a3d393c53ca3481f5b5e8e1","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-7a3d393c53ca3481f5b5e8e1","type":"p","scope":"block-6b8197023f3c4157bbcb484c8154751e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-7a3d393c53ca3481f5b5e8e1","content":"不必按 Notebook 编号把所有内容从头运行。若刚听完课堂，先用 P25 的同一底图区分类别、框、语义与实例，再用 P41–45 的两个算例区分读取错位与表示碰撞。它们构成理解空间任务所需的最短连续线。","sha256":"0a2ecad891c31a62ee9b02e86cdba8178bd3d109c92dba9a0311468b72ee9cd0","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-6b8197023f3c4157bbcb484c8154751e","title":"课后先选一条路","number":15},"sectionTitle":"课后先选一条路","currentQuestion":"课后先选一条路","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-e363775c6c8613630343a894","nextBlock":"b-7b84d73fe6fc01283be07558","prerequisites":[{"id":"b-e363775c6c8613630343a894","url":"#b-e363775c6c8613630343a894","role":"section-title"}],"relatedBlocks":[]},{"id":"b-7b84d73fe6fc01283be07558","type":"p","scope":"block-6b8197023f3c4157bbcb484c8154751e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-7b84d73fe6fc01283be07558","content":"随后只选一项完整学习过程：关心对象位置就读 LAB 10，沿图像、目标、匹配、分类/位置损失、预测与错误图走完；关心面积或边界就读 LAB 11，比较 RGB 基线与 FCN、查看逐类 IoU 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不清时按问题查；LAB 03 是同源场景与空间读数的轻量练习。LAB 16 的颜色连通域和 LAB 20 的集合匹配放在选读，分别解释提示约束和对象排列，不与两项主实验争夺主线。","sha256":"837bce5d8ffa8cd536868905ad4c5c89be41ffc55a734a78bcf596ec6bdbf528","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-6b8197023f3c4157bbcb484c8154751e","title":"课后先选一条路","number":15},"sectionTitle":"课后先选一条路","currentQuestion":"课后先选一条路","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-7b84d73fe6fc01283be07558","nextBlock":"b-22168247872a1ec51804f77d","prerequisites":[{"id":"b-e363775c6c8613630343a894","url":"#b-e363775c6c8613630343a894","role":"section-title"},{"id":"b-7a3d393c53ca3481f5b5e8e1","url":"#b-7a3d393c53ca3481f5b5e8e1","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-22168247872a1ec51804f77d","type":"p","scope":"block-6b8197023f3c4157bbcb484c8154751e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-22168247872a1ec51804f77d","content":"CLS 02 承担区域到掩码的连续导读；CLS 07、08 承担深入公式与实例。每个解释块有独立 URL，可直接带着具体问题交给 AI；链接中的正文先提供推理，再连接代码与原论文。","sha256":"a4a3e8d9bc7de4dab8115f0a754cd72e222ace6bd3de52f1d05d8f780b8ff78f","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-6b8197023f3c4157bbcb484c8154751e","title":"课后先选一条路","number":15},"sectionTitle":"课后先选一条路","currentQuestion":"课后先选一条路","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-604bd8f0d93603e65add919b","nextBlock":"b-72cb9407e1ec16e4b781a1fa","prerequisites":[{"id":"b-e363775c6c8613630343a894","url":"#b-e363775c6c8613630343a894","role":"section-title"},{"id":"b-7a3d393c53ca3481f5b5e8e1","url":"#b-7a3d393c53ca3481f5b5e8e1","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-72cb9407e1ec16e4b781a1fa","type":"p","scope":"block-6b8197023f3c4157bbcb484c8154751e","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-72cb9407e1ec16e4b781a1fa","content":"[打开可单独引用的空间学习路径](/course/blocks/spatial-study-route.html)","sha256":"6082ac4c489757e24a1bbcfb1f02d1c4953229451f9240cca230bb90faad9ce6","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-6b8197023f3c4157bbcb484c8154751e","title":"课后先选一条路","number":15},"sectionTitle":"课后先选一条路","currentQuestion":"课后先选一条路","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-22168247872a1ec51804f77d","nextBlock":null,"prerequisites":[{"id":"b-e363775c6c8613630343a894","url":"#b-e363775c6c8613630343a894","role":"section-title"},{"id":"b-7a3d393c53ca3481f5b5e8e1","url":"#b-7a3d393c53ca3481f5b5e8e1","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-25d8fe63e4c405f9c3dbd328","type":"h2","scope":"block-44be3baf1ddf4d27914e3f2ef66b6820","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-25d8fe63e4c405f9c3dbd328","content":"## 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论文结果](/course/blocks/roi-align-paper-evidence.html)，保留骨干、步长、聚合方式与训练/测试划分。前者是确定性算例，后者是完整模型的历史训练对照。","sha256":"fe07412fd2c39c2b8edf1d22636ceee34132c38b1353efc31019275fd917fa3e","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-44be3baf1ddf4d27914e3f2ef66b6820","title":"把这一段交给 AI 时，保留哪几个条件","number":16},"sectionTitle":"把这一段交给 AI 时，保留哪几个条件","currentQuestion":"把这一段交给 AI 时，保留哪几个条件","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-25d8fe63e4c405f9c3dbd328","nextBlock":"b-84303a68bb1263caa14decf5","prerequisites":[{"id":"b-25d8fe63e4c405f9c3dbd328","url":"#b-25d8fe63e4c405f9c3dbd328","role":"section-title"}],"relatedBlocks":[]},{"id":"b-84303a68bb1263caa14decf5","type":"p","scope":"block-44be3baf1ddf4d27914e3f2ef66b6820","url":"https://codingai-lec03.pages.dev/course/notebooks/f9ab632ba16b4f2084669791cba6ba85.html#b-84303a68bb1263caa14decf5","content":"想查看连续文字可从 [P25](/course/pages/l3-r2-p25.html) 开始；要定位一个公式或追问，可直接引用上方独立块 URL。这样 AI 读到的是具体材料与条件，而不只是模型名字。","sha256":"cec3b8a32093eb23a4ad748ca16d255db4c60bedfbb4e985efe3d5e33696108f","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-answer-contract","title":"任务究竟要求留下什么信息？"},"page":{"id":"reading-block-44be3baf1ddf4d27914e3f2ef66b6820","title":"把这一段交给 AI 时，保留哪几个条件","number":16},"sectionTitle":"把这一段交给 AI 时，保留哪几个条件","currentQuestion":"把这一段交给 AI 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