{"version":2,"relationshipURLBase":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html","relationshipResolution":"Resolve relative relationship URLs against relationshipURLBase; complete records and absolute URLs are in blocks.","title":"解码器补位置，目标来自原图","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html","markdown":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.md","pages":[{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","unit":"限制可见信息，怎样构成可验证的重建任务？","unitId":"i-masked-prediction","chapter":"I","number":1},{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","unit":"限制可见信息，怎样构成可验证的重建任务？","unitId":"i-masked-prediction","chapter":"I","number":2}],"aliases":[{"oldId":"explanation","targetId":"h-i-restore-positions-not-pixels","operation":"split-explanation-range"},{"oldId":"b-60b5e89230f99cfdc83bc224","targetId":"b-60b5e89230f99cfdc83bc224","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","afterSHA256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","reason":"Same source body in authored semantic page"},{"oldId":"b-c7d2393f08cab66e45c2a8fe","targetId":"b-c7d2393f08cab66e45c2a8fe","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"1a6c3615fa124f060c3e980be26ed2e3b1e7ce9a9c419e0be680d96fd9302ccb","afterSHA256":"1a6c3615fa124f060c3e980be26ed2e3b1e7ce9a9c419e0be680d96fd9302ccb","reason":"Same source body in authored semantic page"},{"oldId":"b-205c89896c224f1b48566e6c","targetId":"b-205c89896c224f1b48566e6c","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"aa49ae401ddbd7e2d722e8c4b5c79e44357422e339b0bfce9729a2c00bb5f2ae","afterSHA256":"aa49ae401ddbd7e2d722e8c4b5c79e44357422e339b0bfce9729a2c00bb5f2ae","reason":"Same source body in authored semantic page"},{"oldId":"b-714f55ffc153f8397b01d44d","targetId":"b-714f55ffc153f8397b01d44d","page":"h-i-restore-positions-not-pixels","operation":"rewrite","beforeSHA256":"b87275979d02bb87acf5058e4ad7e312b684a846d0581d57510e7c146a8b5972","afterSHA256":"c4088ab46955743535fe4a61dc814e179f30cfc93d64f9a458578801db48dae8","reason":"Same source identity with figure semantics or reading context enriched"},{"oldId":"b-711df6e70a18441fa742131b","targetId":"b-711df6e70a18441fa742131b","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","afterSHA256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","reason":"Same source body in authored semantic page"},{"oldId":"b-4b4bb7426680cc8dcbc2fb10","targetId":"b-4b4bb7426680cc8dcbc2fb10","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"f0f0cca14ea2a77d23fa459d1ac71095bd3edf116d42d5ad49f92b2d7c7ec1ff","afterSHA256":"f0f0cca14ea2a77d23fa459d1ac71095bd3edf116d42d5ad49f92b2d7c7ec1ff","reason":"Same source body in authored semantic page"},{"oldId":"b-73c817a1a7177e570fa2ff28","targetId":"b-73c817a1a7177e570fa2ff28","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"347257655c4c5021582dc3e8ddb7109c22b92b4b51c9f001f2deed47ab457584","afterSHA256":"347257655c4c5021582dc3e8ddb7109c22b92b4b51c9f001f2deed47ab457584","reason":"Same source body in authored semantic page"},{"oldId":"b-14204e04993de9ea19aeb8b7","targetId":"b-14204e04993de9ea19aeb8b7","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"93c9a763d7a471efada8debd8c55d13c7a88fe0cd6661a7baf997fe14a5ef0fa","afterSHA256":"93c9a763d7a471efada8debd8c55d13c7a88fe0cd6661a7baf997fe14a5ef0fa","reason":"Same source body in authored semantic page"},{"oldId":"b-cf80eaa886ad0849b5be0880","targetId":"b-cf80eaa886ad0849b5be0880","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"7de0739a39bb7b319d607392cdf7ba40d0d0602f0380cbeff4eabe1a19d402f2","afterSHA256":"7de0739a39bb7b319d607392cdf7ba40d0d0602f0380cbeff4eabe1a19d402f2","reason":"Same source body in authored semantic page"},{"oldId":"b-af0767c16feb4c0e1367cb2b","targetId":"b-af0767c16feb4c0e1367cb2b","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"2e5521ede2f6dd07a26bd91b6a70919737fa9337d6a5c0631ecda8c61f1d6c8b","afterSHA256":"2e5521ede2f6dd07a26bd91b6a70919737fa9337d6a5c0631ecda8c61f1d6c8b","reason":"Same source body in authored semantic page"},{"oldId":"b-1671fd109899cbef323bb943","targetId":"b-1671fd109899cbef323bb943","page":"h-i-restore-positions-not-pixels","operation":"move","beforeSHA256":"4967131c69ec200e8f68f3ba87187e836a4b72e949d7625a6d46ea8ef54a7c3b","afterSHA256":"4967131c69ec200e8f68f3ba87187e836a4b72e949d7625a6d46ea8ef54a7c3b","reason":"Same source body in authored semantic page"},{"oldId":"b-e2368f730fec015491bac2b1","targetId":"b-e2368f730fec015491bac2b1","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"af2d608a6191f692fec842bedeea1c0350f6418e5d98f1788ef14e6b9454bc8f","afterSHA256":"af2d608a6191f692fec842bedeea1c0350f6418e5d98f1788ef14e6b9454bc8f","reason":"Same source body in authored semantic page"},{"oldId":"b-c105c110b6723749f2e1219e","targetId":"b-c105c110b6723749f2e1219e","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"e482018404dbe89a2de6e4a4a8a91074f75ca7ee4d82b34fc8e1edcf5b9e391c","afterSHA256":"e482018404dbe89a2de6e4a4a8a91074f75ca7ee4d82b34fc8e1edcf5b9e391c","reason":"Same source body in authored semantic page"},{"oldId":"b-cd1a7a345d6fecfcc10ec6c8","targetId":"b-cd1a7a345d6fecfcc10ec6c8","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"ba89d4a5e0a04dd83a9edafbf7dcab3afe7f0b478627768042f8f370dd1f31ae","afterSHA256":"ba89d4a5e0a04dd83a9edafbf7dcab3afe7f0b478627768042f8f370dd1f31ae","reason":"Same source body in authored semantic page"},{"oldId":"b-4a4c114a3270dc821835eebd","targetId":"b-4a4c114a3270dc821835eebd","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"1471ce4a8000b27c653742e3702754f6b6db46f6e878b8e12901808c4df9c073","afterSHA256":"1471ce4a8000b27c653742e3702754f6b6db46f6e878b8e12901808c4df9c073","reason":"Same source body in authored semantic page"},{"oldId":"b-e2968e71ba4c5435eb8d798b","targetId":"b-e2968e71ba4c5435eb8d798b","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"38922e69985897672f1ed7137976ff00edf73850e65cb88f07b3498bf8338e25","afterSHA256":"38922e69985897672f1ed7137976ff00edf73850e65cb88f07b3498bf8338e25","reason":"Same source body in authored semantic page"},{"oldId":"b-5e87181fd3214aaf8c9f3c9b","targetId":"b-5e87181fd3214aaf8c9f3c9b","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"3372b11342ebcdd9d3768ed439f5cd51b1b41364077b222a213f25f95759dd5d","afterSHA256":"3372b11342ebcdd9d3768ed439f5cd51b1b41364077b222a213f25f95759dd5d","reason":"Same source body in authored semantic page"},{"oldId":"b-596a7c1aa6c9368c8b853cd8","targetId":"b-596a7c1aa6c9368c8b853cd8","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"5e950da9f05130cff035f23a09f66f44af012c2effb3a3947f44fe3a7cbbff59","afterSHA256":"5e950da9f05130cff035f23a09f66f44af012c2effb3a3947f44fe3a7cbbff59","reason":"Same source body in authored semantic page"},{"oldId":"b-03ae4ed85413aedc43f27420","targetId":"b-03ae4ed85413aedc43f27420","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"3fab7ed78949f741fa0080b92c42389e80eccd1039715f3020a776ebbc85573c","afterSHA256":"3fab7ed78949f741fa0080b92c42389e80eccd1039715f3020a776ebbc85573c","reason":"Same source body in authored semantic page"},{"oldId":"b-0636f40f0c7412879d9b892d","targetId":"b-0636f40f0c7412879d9b892d","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"252768d9c63fdc8020d8bb7e99d5a42c12ec0207ab0f50a0d7084bb50ee2e05d","afterSHA256":"252768d9c63fdc8020d8bb7e99d5a42c12ec0207ab0f50a0d7084bb50ee2e05d","reason":"Same source body in authored semantic page"},{"oldId":"b-db8ccff1bde76bd1148f8ec8","targetId":"b-db8ccff1bde76bd1148f8ec8","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"6fac9a831ff6e535201056592a8ac6151184286bd859ef56c79e042941628185","afterSHA256":"6fac9a831ff6e535201056592a8ac6151184286bd859ef56c79e042941628185","reason":"Same source body in authored semantic page"},{"oldId":"b-12787e556faf0e38b1018aed","targetId":"b-12787e556faf0e38b1018aed","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"f8cac5387ae06a655b53352831667d993d60818d569ab93b949960a45afd70fa","afterSHA256":"f8cac5387ae06a655b53352831667d993d60818d569ab93b949960a45afd70fa","reason":"Same source body in authored semantic page"},{"oldId":"b-54702fc38d7cfa5c16b8f591","targetId":"b-54702fc38d7cfa5c16b8f591","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"5fba9687f1063a09fe6952078c4603540def9cd0c43193f93cf00ebbaf0c6a28","afterSHA256":"5fba9687f1063a09fe6952078c4603540def9cd0c43193f93cf00ebbaf0c6a28","reason":"Same source body in authored semantic page"},{"oldId":"b-8cfad49de705e379c7dda233","targetId":"b-8cfad49de705e379c7dda233","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","afterSHA256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","reason":"Same source body in authored semantic page"},{"oldId":"b-271317f495f3f7a7cd780dbe","targetId":"b-271317f495f3f7a7cd780dbe","page":"h-i-masked-loss-and-known-positions","operation":"move","beforeSHA256":"b7221b0b354deabdfeccedbb1bd6f50cf4c5124d84491e849bd13a9891b81ca9","afterSHA256":"b7221b0b354deabdfeccedbb1bd6f50cf4c5124d84491e849bd13a9891b81ca9","reason":"Same source body in authored semantic page"},{"oldId":"h-i-restore-positions-not-pixels-title","targetId":"b-5f20459515a115b2cc93cecd","operation":"retain-source-identity"},{"oldId":"h-i-masked-loss-and-known-positions-title","targetId":"b-2fc1eeef206d58975c1b7ef0","operation":"retain-source-identity"},{"oldId":"h-i-masked-loss-and-known-positions-bridge","targetId":"b-01617afb5a070181d45a483e","operation":"retain-source-identity"}],"blocks":[{"id":"b-5f20459515a115b2cc93cecd","type":"h2","scope":"h-i-restore-positions-not-pixels","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-5f20459515a115b2cc93cecd","content":"## 逆排列先恢复位置，像素答案仍然未知","sha256":"2282f7dc3f872d968d2c3ba43e53e041cb2515d3900a744f3d6fcbd197ffeb30","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-60b5e89230f99cfdc83bc224","prerequisites":[{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-60b5e89230f99cfdc83bc224","type":"h2","scope":"explanation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-60b5e89230f99cfdc83bc224","content":"## 解释、算例与证据","sha256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-5f20459515a115b2cc93cecd","nextBlock":"b-c7d2393f08cab66e45c2a8fe","prerequisites":[{"id":"b-5f20459515a115b2cc93cecd","url":"#b-5f20459515a115b2cc93cecd","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-c7d2393f08cab66e45c2a8fe","type":"h1","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-c7d2393f08cab66e45c2a8fe","content":"# P21 · 解码器补位置，目标来自原图","sha256":"1a6c3615fa124f060c3e980be26ed2e3b1e7ce9a9c419e0be680d96fd9302ccb","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-60b5e89230f99cfdc83bc224","nextBlock":"b-205c89896c224f1b48566e6c","prerequisites":[{"id":"b-60b5e89230f99cfdc83bc224","url":"#b-60b5e89230f99cfdc83bc224","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-205c89896c224f1b48566e6c","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-205c89896c224f1b48566e6c","content":"解码阶段恢复位置，再预测内容；目标从原图来，误差只在隐藏集合比较。","sha256":"aa49ae401ddbd7e2d722e8c4b5c79e44357422e339b0bfce9729a2c00bb5f2ae","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-c7d2393f08cab66e45c2a8fe","nextBlock":"b-714f55ffc153f8397b01d44d","prerequisites":[{"id":"b-c7d2393f08cab66e45c2a8fe","url":"#b-c7d2393f08cab66e45c2a8fe","role":"section-title"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-714f55ffc153f8397b01d44d","type":"figure","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-714f55ffc153f8397b01d44d","content":"图内标签与数值：P21 学习表示机制图，状态 2；解码端：所有位置加入 pᵢ；隐藏位置共用一个 mask 向量 M；h0+p0；M+p1；M+p2；h3+p3；M+p4；M+p5；M+p6；M+p7；M+p8；h9+p9；M+p10；M+p11；M+p12；M+p13；h14+p14；M+p15；4 个 h + 12 个 M；轻量解码器；ŷ0；ŷ1；ŷ2；ŷ3；ŷ4；ŷ5；ŷ6；ŷ7；ŷ8；ŷ9；ŷ10；ŷ11；ŷ12；ŷ13；ŷ14；ŷ15；各位置的像素预测（符号示意）；原图目标 x；L = (1/12) Σ隐藏块 MSE(ŷᵢ, xᵢ)；橙框：12 个计入 loss 的位置；预训练后留下编码器；重建用解码器不必进入下游系统。\n\n4个编码结果和12个共享mask加位置线索进入解码器；输出是16个符号像素预测，橙框只标隐藏位置，原图小图为目标。\n\n- 解码端：所有位置加入 pᵢ；隐藏位置共用一个 mask 向量 M\n- h0+p0\n- M+p1\n- M+p2\n- h3+p3\n- M+p4\n- M+p5\n- M+p6\n- M+p7\n- M+p8\n- h9+p9\n- M+p10\n- M+p11\n- M+p12\n- M+p13\n- h14+p14\n- M+p15\n- 4 个 h + 12 个 M\n- 轻量解码器\n- ŷ0\n- ŷ1\n- ŷ2\n- ŷ3\n- ŷ4\n- ŷ5\n- ŷ6\n- ŷ7\n- ŷ8\n- ŷ9\n- ŷ10\n- ŷ11\n- ŷ12\n- ŷ13\n- ŷ14\n- ŷ15\n- 各位置的像素预测（符号示意）\n- 原图目标 x\n- L = (1/12) Σ隐藏块 MSE(ŷᵢ, xᵢ)\n- 橙框：12 个计入 loss 的位置\n- 预训练后留下编码器；重建用解码器不必进入下游系统。4个编码结果和12个共享mask加位置线索进入解码器；输出是16个符号像素预测，橙框只标隐藏位置，原图小图为目标。 [查看对应图解状态](/#/l3-r2-p21/1)[查看完整图解](/course/figures/l3-r2-p21-1.html)","sha256":"c4088ab46955743535fe4a61dc814e179f30cfc93d64f9a458578801db48dae8","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"4个编码结果和12个共享mask加位置线索进入解码器；输出是16个符号像素预测，橙框只标隐藏位置，原图小图为目标。 查看对应图解状态","labels":["解码端：所有位置加入 pᵢ；隐藏位置共用一个 mask 向量 M","h0+p0","M+p1","M+p2","h3+p3","M+p4","M+p5","M+p6","M+p7","M+p8","h9+p9","M+p10","M+p11","M+p12","M+p13","h14+p14","M+p15","4 个 h + 12 个 M","轻量解码器","ŷ0","ŷ1","ŷ2","ŷ3","ŷ4","ŷ5","ŷ6","ŷ7","ŷ8","ŷ9","ŷ10","ŷ11","ŷ12","ŷ13","ŷ14","ŷ15","各位置的像素预测（符号示意）","原图目标 x","L = (1/12) Σ隐藏块 MSE(ŷᵢ, xᵢ)","橙框：12 个计入 loss 的位置","预训练后留下编码器；重建用解码器不必进入下游系统。"],"description":"4个编码结果和12个共享mask加位置线索进入解码器；输出是16个符号像素预测，橙框只标隐藏位置，原图小图为目标。解码端：所有位置加入 pᵢ；隐藏位置共用一个 mask 向量 Mh0+p0M+p1M+p2h3+p3M+p4M+p5M+p6M+p7M+p8h9+p9M+p10M+p11M+p12M+p13h14+p14M+p154 个 h + 12 个 M轻量解码器ŷ0ŷ1ŷ2ŷ3ŷ4ŷ5ŷ6ŷ7ŷ8ŷ9ŷ10ŷ11ŷ12ŷ13ŷ14ŷ15各位置的像素预测（符号示意）原图目标 xL = (1/12) Σ隐藏块 MSE(ŷᵢ, xᵢ)橙框：12 个计入 loss 的位置预训练后留下编码器；重建用解码器不必进入下游系统。","evidenceIdentity":"4个编码结果和12个共享mask加位置线索进入解码器；输出是16个符号像素预测，橙框只标隐藏位置，原图小图为目标。 查看对应图解状态","images":[{"src":"/assets/display/584c419ba431799ff41df983.webp","alt":""}]},"previousBlock":"b-205c89896c224f1b48566e6c","nextBlock":"b-711df6e70a18441fa742131b","prerequisites":[{"id":"b-c7d2393f08cab66e45c2a8fe","url":"#b-c7d2393f08cab66e45c2a8fe","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-711df6e70a18441fa742131b","type":"h2","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-711df6e70a18441fa742131b","content":"## 课堂讲述","sha256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-714f55ffc153f8397b01d44d","nextBlock":"b-4b4bb7426680cc8dcbc2fb10","prerequisites":[{"id":"b-c7d2393f08cab66e45c2a8fe","url":"#b-c7d2393f08cab66e45c2a8fe","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-4b4bb7426680cc8dcbc2fb10","type":"p","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-4b4bb7426680cc8dcbc2fb10","content":"来到解码阶段，编码结果和缺失位置的占位向量一起形成完整的位置集合。解码器根据这些信息预测像素，训练时拿原图中被隐藏的内容作目标。\n于是答案的来源很清楚：我们先把它挡住，再让模型预测，不需要另外请人标“这是一只猫”。原始 MAE 的损失计算在被遮住的图块上，不能只靠复制已经看见的部分完成任务。\n更重要的是，预训练结束后，我们关心的是留下的编码器表示；为重建服务的解码器不必成为后续分类或检测系统的一部分。这也解释了为什么编码端和解码端可以承担不同重量。接下来要问：重建完成得好，是否就说明留下的表示什么都适合？","sha256":"f0f0cca14ea2a77d23fa459d1ac71095bd3edf116d42d5ad49f92b2d7c7ec1ff","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-711df6e70a18441fa742131b","nextBlock":"b-73c817a1a7177e570fa2ff28","prerequisites":[{"id":"b-711df6e70a18441fa742131b","url":"#b-711df6e70a18441fa742131b","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-73c817a1a7177e570fa2ff28","type":"h3","scope":"mae-shuffle-restore-worked-example","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-73c817a1a7177e570fa2ff28","content":"### 补回位置与补回像素，是两件事","sha256":"347257655c4c5021582dc3e8ddb7109c22b92b4b51c9f001f2deed47ab457584","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"补回位置与补回像素，是两件事","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-shuffle-restore-worked-example","formulas":[],"previousBlock":"b-4b4bb7426680cc8dcbc2fb10","nextBlock":"b-14204e04993de9ea19aeb8b7","prerequisites":[{"id":"b-711df6e70a18441fa742131b","url":"#b-711df6e70a18441fa742131b","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"},{"id":"b-14204e04993de9ea19aeb8b7","url":"#b-14204e04993de9ea19aeb8b7","relation":"same-reasoning"},{"id":"b-cf80eaa886ad0849b5be0880","url":"#b-cf80eaa886ad0849b5be0880","relation":"same-reasoning"},{"id":"b-af0767c16feb4c0e1367cb2b","url":"#b-af0767c16feb4c0e1367cb2b","relation":"same-reasoning"}]},{"id":"b-14204e04993de9ea19aeb8b7","type":"p","scope":"mae-shuffle-restore-worked-example","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-14204e04993de9ea19aeb8b7","content":"用4个位置缩小算例。原位置是[0,1,2,3]，随机顺序为[2,0,3,1]，取前两项进入编码器。得到[z2,z0]后，解码阶段先加两个mask项：[z2,z0,M,M]。逆排列为[1,3,0,2]，按它取值后成为[z0,M,z2,M]。","sha256":"93c9a763d7a471efada8debd8c55d13c7a88fe0cd6661a7baf997fe14a5ef0fa","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"补回位置与补回像素，是两件事","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-shuffle-restore-worked-example","formulas":[],"previousBlock":"b-73c817a1a7177e570fa2ff28","nextBlock":"b-cf80eaa886ad0849b5be0880","prerequisites":[{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"},{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","relation":"same-reasoning"},{"id":"b-cf80eaa886ad0849b5be0880","url":"#b-cf80eaa886ad0849b5be0880","relation":"same-reasoning"},{"id":"b-af0767c16feb4c0e1367cb2b","url":"#b-af0767c16feb4c0e1367cb2b","relation":"same-reasoning"}]},{"id":"b-cf80eaa886ad0849b5be0880","type":"p","scope":"mae-shuffle-restore-worked-example","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-cf80eaa886ad0849b5be0880","content":"这时我们只是恢复了“谁在什么位置”。位置1和3仍未知，M不是正确像素；解码器要结合可见内容及各位置线索作预测，再与原图相应位置比较。","sha256":"7de0739a39bb7b319d607392cdf7ba40d0d0602f0380cbeff4eabe1a19d402f2","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"补回位置与补回像素，是两件事","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-shuffle-restore-worked-example","formulas":[],"previousBlock":"b-14204e04993de9ea19aeb8b7","nextBlock":"b-af0767c16feb4c0e1367cb2b","prerequisites":[{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"},{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","relation":"same-reasoning"},{"id":"b-14204e04993de9ea19aeb8b7","url":"#b-14204e04993de9ea19aeb8b7","relation":"same-reasoning"},{"id":"b-af0767c16feb4c0e1367cb2b","url":"#b-af0767c16feb4c0e1367cb2b","relation":"same-reasoning"}]},{"id":"b-af0767c16feb4c0e1367cb2b","type":"p","scope":"mae-shuffle-restore-worked-example","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-af0767c16feb4c0e1367cb2b","content":"如果忘了逆排列，模型可能把正确形状放到错误坐标，loss也会对错位置。LAB 08的索引热身正好检查这个对应关系；后面的卷积重建才包含参数学习。不要把数组重排成功写成模型学会了补图。","sha256":"2e5521ede2f6dd07a26bd91b6a70919737fa9337d6a5c0631ecda8c61f1d6c8b","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"补回位置与补回像素，是两件事","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-shuffle-restore-worked-example","formulas":[],"previousBlock":"b-cf80eaa886ad0849b5be0880","nextBlock":"b-837987d5cfbf4cccb2e50ab4","prerequisites":[{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"},{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","relation":"same-reasoning"},{"id":"b-14204e04993de9ea19aeb8b7","url":"#b-14204e04993de9ea19aeb8b7","relation":"same-reasoning"},{"id":"b-cf80eaa886ad0849b5be0880","url":"#b-cf80eaa886ad0849b5be0880","relation":"same-reasoning"}]},{"id":"b-837987d5cfbf4cccb2e50ab4","type":"h4","scope":"h-i-restore-positions-not-pixels","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-837987d5cfbf4cccb2e50ab4","content":"#### 图示条件与公式约定","sha256":"ef7f915c1ae63ed67bd23fecf050249273ba0efa8965d2c8d1c1c6b2d3178122","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-af0767c16feb4c0e1367cb2b","nextBlock":"b-1671fd109899cbef323bb943","prerequisites":[{"id":"b-73c817a1a7177e570fa2ff28","url":"#b-73c817a1a7177e570fa2ff28","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-1671fd109899cbef323bb943","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-1671fd109899cbef323bb943","content":"M 为共享学习向量，各位置还需位置线索；h 为相应可见块的编码结果（进入解码前可投影维度）。ŷ_i 是预测像素向量的符号占位，图中的原图小图是监督目标而不是重建结果。展示未归一化像素MSE；原论文亦比较逐块像素归一化目标。loss 的求和与平均仅在隐藏位置。","sha256":"4967131c69ec200e8f68f3ba87187e836a4b72e949d7625a6d46ea8ef54a7c3b","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-restore-positions-not-pixels","title":"逆排列先恢复位置，像素答案仍然未知","number":1},"sectionTitle":"逆排列先恢复位置，像素答案仍然未知","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-837987d5cfbf4cccb2e50ab4","nextBlock":null,"prerequisites":[{"id":"b-837987d5cfbf4cccb2e50ab4","url":"#b-837987d5cfbf4cccb2e50ab4","role":"section-title"},{"id":"b-205c89896c224f1b48566e6c","url":"#b-205c89896c224f1b48566e6c","role":"problem-context"}],"relatedBlocks":[{"id":"b-714f55ffc153f8397b01d44d","url":"#b-714f55ffc153f8397b01d44d","relation":"figure-and-explanation"}]},{"id":"b-2fc1eeef206d58975c1b7ef0","type":"h2","scope":"h-i-masked-loss-and-known-positions","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-2fc1eeef206d58975c1b7ef0","content":"## 只评价隐藏位置，别让已知真值稀释误差","sha256":"8baf9709f97a2f1ec7bc22b63d8f641831732ac32b20cecf8b70dca225a0ce8e","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只评价隐藏位置，别让已知真值稀释误差","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-01617afb5a070181d45a483e","prerequisites":[{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-01617afb5a070181d45a483e","type":"p","scope":"h-i-masked-loss-and-known-positions","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-01617afb5a070181d45a483e","content":"已知位置、未知内容和用于比较的原图，是三种不同对象。","sha256":"5fe525697e7379acd8d113d90f03c41389475cf4903736b00f3781cd75573105","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只评价隐藏位置，别让已知真值稀释误差","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-2fc1eeef206d58975c1b7ef0","nextBlock":"b-e2368f730fec015491bac2b1","prerequisites":[{"id":"b-2fc1eeef206d58975c1b7ef0","url":"#b-2fc1eeef206d58975c1b7ef0","role":"section-title"}],"relatedBlocks":[]},{"id":"b-e2368f730fec015491bac2b1","type":"h3","scope":"mae-masked-loss-denominator","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-e2368f730fec015491bac2b1","content":"### 只在隐藏位置算损失，分母也要一致","sha256":"af2d608a6191f692fec842bedeea1c0350f6418e5d98f1788ef14e6b9454bc8f","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只在隐藏位置算损失，分母也要一致","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-masked-loss-denominator","formulas":[],"previousBlock":"b-01617afb5a070181d45a483e","nextBlock":"b-c105c110b6723749f2e1219e","prerequisites":[{"id":"b-2fc1eeef206d58975c1b7ef0","url":"#b-2fc1eeef206d58975c1b7ef0","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-c105c110b6723749f2e1219e","url":"#b-c105c110b6723749f2e1219e","relation":"same-reasoning"},{"id":"b-cd1a7a345d6fecfcc10ec6c8","url":"#b-cd1a7a345d6fecfcc10ec6c8","relation":"same-reasoning"},{"id":"b-4a4c114a3270dc821835eebd","url":"#b-4a4c114a3270dc821835eebd","relation":"same-reasoning"}]},{"id":"b-c105c110b6723749f2e1219e","type":"p","scope":"mae-masked-loss-denominator","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-c105c110b6723749f2e1219e","content":"令隐藏集合为 $\\mathcal M$，每个patch含P个像素值。一个清晰的口径是先在patch内平均，再在隐藏patch间平均：$L=|\\mathcal M|^{-1}\\sum_{i\\in\\mathcal M}P^{-1}\\sum_{p=1}^{P}(\\hat x_{ip}-x_{ip})^2$。16块中隐藏12块时，外层分母就是12。","sha256":"e482018404dbe89a2de6e4a4a8a91074f75ca7ee4d82b34fc8e1edcf5b9e391c","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只在隐藏位置算损失，分母也要一致","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-masked-loss-denominator","formulas":[{"latex":"\\mathcal M","definitionContext":"令隐藏集合为 $\\mathcal M$，每个patch含P个像素值。一个清晰的口径是先在patch内平均，再在隐藏patch间平均：$L=|\\mathcal M|^{-1}\\sum_{i\\in\\mathcal M}P^{-1}\\sum_{p=1}^{P}(\\hat x_{ip}-x_{ip})^2$。16块中隐藏12块时，外层分母就是12。\n若把已知可见像素直接拼回预测图，它们误差天然为零。此时对整图平均会使指标更小，却没有改善隐藏预测。图像面板可以为方便阅读拼回可见真值，但必须说明；数值则继续评价隐藏集合。\n原论文还讨论对每个patch的像素做归一化后作为目标。比较不同实验时，要同时核对预测位置、像素缩放及归一化；同样叫“MSE”的数，分母和目标一变就未必可比。"},{"latex":"L=|\\mathcal M|^{-1}\\sum_{i\\in\\mathcal M}P^{-1}\\sum_{p=1}^{P}(\\hat x_{ip}-x_{ip})^2","definitionContext":"令隐藏集合为 $\\mathcal M$，每个patch含P个像素值。一个清晰的口径是先在patch内平均，再在隐藏patch间平均：$L=|\\mathcal M|^{-1}\\sum_{i\\in\\mathcal M}P^{-1}\\sum_{p=1}^{P}(\\hat x_{ip}-x_{ip})^2$。16块中隐藏12块时，外层分母就是12。\n若把已知可见像素直接拼回预测图，它们误差天然为零。此时对整图平均会使指标更小，却没有改善隐藏预测。图像面板可以为方便阅读拼回可见真值，但必须说明；数值则继续评价隐藏集合。\n原论文还讨论对每个patch的像素做归一化后作为目标。比较不同实验时，要同时核对预测位置、像素缩放及归一化；同样叫“MSE”的数，分母和目标一变就未必可比。"}],"previousBlock":"b-e2368f730fec015491bac2b1","nextBlock":"b-cd1a7a345d6fecfcc10ec6c8","prerequisites":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","relation":"same-reasoning"},{"id":"b-cd1a7a345d6fecfcc10ec6c8","url":"#b-cd1a7a345d6fecfcc10ec6c8","relation":"same-reasoning"},{"id":"b-4a4c114a3270dc821835eebd","url":"#b-4a4c114a3270dc821835eebd","relation":"same-reasoning"}]},{"id":"b-cd1a7a345d6fecfcc10ec6c8","type":"p","scope":"mae-masked-loss-denominator","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-cd1a7a345d6fecfcc10ec6c8","content":"若把已知可见像素直接拼回预测图，它们误差天然为零。此时对整图平均会使指标更小，却没有改善隐藏预测。图像面板可以为方便阅读拼回可见真值，但必须说明；数值则继续评价隐藏集合。","sha256":"ba89d4a5e0a04dd83a9edafbf7dcab3afe7f0b478627768042f8f370dd1f31ae","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只在隐藏位置算损失，分母也要一致","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-masked-loss-denominator","formulas":[],"previousBlock":"b-c105c110b6723749f2e1219e","nextBlock":"b-4a4c114a3270dc821835eebd","prerequisites":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","relation":"same-reasoning"},{"id":"b-c105c110b6723749f2e1219e","url":"#b-c105c110b6723749f2e1219e","relation":"same-reasoning"},{"id":"b-4a4c114a3270dc821835eebd","url":"#b-4a4c114a3270dc821835eebd","relation":"same-reasoning"}]},{"id":"b-4a4c114a3270dc821835eebd","type":"p","scope":"mae-masked-loss-denominator","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-4a4c114a3270dc821835eebd","content":"原论文还讨论对每个patch的像素做归一化后作为目标。比较不同实验时，要同时核对预测位置、像素缩放及归一化；同样叫“MSE”的数，分母和目标一变就未必可比。","sha256":"1471ce4a8000b27c653742e3702754f6b6db46f6e878b8e12901808c4df9c073","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只在隐藏位置算损失，分母也要一致","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-masked-loss-denominator","formulas":[],"previousBlock":"b-cd1a7a345d6fecfcc10ec6c8","nextBlock":"b-e2968e71ba4c5435eb8d798b","prerequisites":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","relation":"same-reasoning"},{"id":"b-c105c110b6723749f2e1219e","url":"#b-c105c110b6723749f2e1219e","relation":"same-reasoning"},{"id":"b-cd1a7a345d6fecfcc10ec6c8","url":"#b-cd1a7a345d6fecfcc10ec6c8","relation":"same-reasoning"}]},{"id":"b-e2968e71ba4c5435eb8d798b","type":"h3","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-e2968e71ba4c5435eb8d798b","content":"### 模拟问答：不知道的地方为何还有位置？","sha256":"38922e69985897672f1ed7137976ff00edf73850e65cb88f07b3498bf8338e25","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-4a4c114a3270dc821835eebd","nextBlock":"b-5e87181fd3214aaf8c9f3c9b","prerequisites":[{"id":"b-e2368f730fec015491bac2b1","url":"#b-e2368f730fec015491bac2b1","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-5e87181fd3214aaf8c9f3c9b","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-5e87181fd3214aaf8c9f3c9b","content":"以下为备课用模拟对话，不是实际课堂记录。","sha256":"3372b11342ebcdd9d3768ed439f5cd51b1b41364077b222a213f25f95759dd5d","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-e2968e71ba4c5435eb8d798b","nextBlock":"b-596a7c1aa6c9368c8b853cd8","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-596a7c1aa6c9368c8b853cd8","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-596a7c1aa6c9368c8b853cd8","content":"**学生：**“遮住的地方没有像素，为什么解码器还有16项？”","sha256":"5e950da9f05130cff035f23a09f66f44af012c2effb3a3947f44fe3a7cbbff59","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-5e87181fd3214aaf8c9f3c9b","nextBlock":"b-03ae4ed85413aedc43f27420","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-03ae4ed85413aedc43f27420","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-03ae4ed85413aedc43f27420","content":"**教师：**“我们不知道内容，但知道问题要问哪个位置。可见位置放编码表示，隐藏位置放共同的mask占位，再给每项自己的位置线索。占位不是答案，位置告诉模型答案该落在哪儿。”","sha256":"3fab7ed78949f741fa0080b92c42389e80eccd1039715f3020a776ebbc85573c","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-596a7c1aa6c9368c8b853cd8","nextBlock":"b-0636f40f0c7412879d9b892d","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-0636f40f0c7412879d9b892d","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-0636f40f0c7412879d9b892d","content":"**学生：**“既然原图有答案，为什么不直接把它送进去？”","sha256":"252768d9c63fdc8020d8bb7e99d5a42c12ec0207ab0f50a0d7084bb50ee2e05d","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-03ae4ed85413aedc43f27420","nextBlock":"b-db8ccff1bde76bd1148f8ec8","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-db8ccff1bde76bd1148f8ec8","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-db8ccff1bde76bd1148f8ec8","content":"**教师：**“原图由损失端保存。若把隐藏像素作为输入，模型就可能复制，遮挡任务被取消了。看图时把编码器入口和损失比较端分开。”","sha256":"6fac9a831ff6e535201056592a8ac6151184286bd859ef56c79e042941628185","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-0636f40f0c7412879d9b892d","nextBlock":"b-12787e556faf0e38b1018aed","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-12787e556faf0e38b1018aed","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-12787e556faf0e38b1018aed","content":"**学生：**“补得像原图，就算学会分类了吗？”","sha256":"f8cac5387ae06a655b53352831667d993d60818d569ab93b949960a45afd70fa","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-db8ccff1bde76bd1148f8ec8","nextBlock":"b-54702fc38d7cfa5c16b8f591","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-54702fc38d7cfa5c16b8f591","url":"#b-54702fc38d7cfa5c16b8f591","relation":"same-reasoning"}]},{"id":"b-54702fc38d7cfa5c16b8f591","type":"p","scope":"mae-position-dialogue","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-54702fc38d7cfa5c16b8f591","content":"**教师：**“那说明重建这件事做得更好。下一页再冻住编码器，另用标签做读出；只有测到那份结果，才能说明表示对分类有用。”","sha256":"5fba9687f1063a09fe6952078c4603540def9cd0c43193f93cf00ebbaf0c6a28","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"模拟问答：不知道的地方为何还有位置？","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":"mae-position-dialogue","formulas":[],"previousBlock":"b-12787e556faf0e38b1018aed","nextBlock":"b-8cfad49de705e379c7dda233","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","relation":"same-reasoning"},{"id":"b-5e87181fd3214aaf8c9f3c9b","url":"#b-5e87181fd3214aaf8c9f3c9b","relation":"same-reasoning"},{"id":"b-596a7c1aa6c9368c8b853cd8","url":"#b-596a7c1aa6c9368c8b853cd8","relation":"same-reasoning"},{"id":"b-03ae4ed85413aedc43f27420","url":"#b-03ae4ed85413aedc43f27420","relation":"same-reasoning"},{"id":"b-0636f40f0c7412879d9b892d","url":"#b-0636f40f0c7412879d9b892d","relation":"same-reasoning"},{"id":"b-db8ccff1bde76bd1148f8ec8","url":"#b-db8ccff1bde76bd1148f8ec8","relation":"same-reasoning"},{"id":"b-12787e556faf0e38b1018aed","url":"#b-12787e556faf0e38b1018aed","relation":"same-reasoning"}]},{"id":"b-8cfad49de705e379c7dda233","type":"h2","scope":"practice","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-8cfad49de705e379c7dda233","content":"## 沿这个问题继续","sha256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只评价隐藏位置，别让已知真值稀释误差","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-54702fc38d7cfa5c16b8f591","nextBlock":"b-271317f495f3f7a7cd780dbe","prerequisites":[{"id":"b-e2968e71ba4c5435eb8d798b","url":"#b-e2968e71ba4c5435eb8d798b","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-271317f495f3f7a7cd780dbe","type":"p","scope":"practice","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p21.html#b-271317f495f3f7a7cd780dbe","content":"先手算四位置逆排列与分母，再读模拟问答。理解位置后才进入LAB 08重建与误差图。","sha256":"b7221b0b354deabdfeccedbb1bd6f50cf4c5124d84491e849bd13a9891b81ca9","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-masked-prediction","title":"限制可见信息，怎样构成可验证的重建任务？"},"page":{"id":"h-i-masked-loss-and-known-positions","title":"只评价隐藏位置，别让已知真值稀释误差","number":2},"sectionTitle":"只评价隐藏位置，别让已知真值稀释误差","currentQuestion":"限制可见信息，怎样构成可验证的重建任务？","sourceSlides":["l3-r2-p21"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8cfad49de705e379c7dda233","nextBlock":null,"prerequisites":[{"id":"b-8cfad49de705e379c7dda233","url":"#b-8cfad49de705e379c7dda233","role":"section-title"},{"id":"b-01617afb5a070181d45a483e","url":"#b-01617afb5a070181d45a483e","role":"problem-context"}],"relatedBlocks":[]}]}