{"version":2,"relationshipURLBase":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html","relationshipResolution":"Resolve relative relationship URLs against relationshipURLBase; complete records and absolute URLs are in blocks.","title":"同源、同类与负例不是同一回事","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html","markdown":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.md","pages":[{"id":"reading-opening","title":"同源、同类与负例不是同一回事","unit":"视图关系怎样成为学习目标，又会牺牲什么？","unitId":"i-view-objective","chapter":"I","number":1}],"aliases":[{"oldId":"b-8999a84e284e5432e1cb6987","targetId":"b-8999a84e284e5432e1cb6987","page":"reading-opening","operation":"move","beforeSHA256":"f7e895722165c2af43405403560044ed922a644b90aff1174eb352c41bc309a7","afterSHA256":"f7e895722165c2af43405403560044ed922a644b90aff1174eb352c41bc309a7","reason":"Same source body in authored semantic page"},{"oldId":"b-36c0953a6a18d371ba748285","targetId":"b-36c0953a6a18d371ba748285","page":"reading-opening","operation":"move","beforeSHA256":"3222212bf5cbe0eec589043390b2f51c1f3c6d3dbc43803192d2323e08ef9f46","afterSHA256":"3222212bf5cbe0eec589043390b2f51c1f3c6d3dbc43803192d2323e08ef9f46","reason":"Same source body in authored semantic page"},{"oldId":"b-c90c5e15f1ed70927dcc4cde","targetId":"b-c90c5e15f1ed70927dcc4cde","page":"reading-opening","operation":"move","beforeSHA256":"e05639d29c1e9d147bd2766dd00ecfe08ffbd85c314e20d84e2d2b50df476add","afterSHA256":"e05639d29c1e9d147bd2766dd00ecfe08ffbd85c314e20d84e2d2b50df476add","reason":"Same source body in authored semantic page"},{"oldId":"b-c11e61831e6335ba0a1a4f75","targetId":"b-c11e61831e6335ba0a1a4f75","page":"reading-opening","operation":"move","beforeSHA256":"79f2869954760e92d4d6a1d5beb8c623a858a17af2434e1fe2d7d46464d9e58d","afterSHA256":"79f2869954760e92d4d6a1d5beb8c623a858a17af2434e1fe2d7d46464d9e58d","reason":"Same source body in authored semantic page"},{"oldId":"b-7c2ff5e0efa0bcccbbf3137a","targetId":"b-7c2ff5e0efa0bcccbbf3137a","page":"reading-opening","operation":"move","beforeSHA256":"455418a5d87053a9ef6215132e2936c7b49bd25423b83dbec784c79894d4ff21","afterSHA256":"455418a5d87053a9ef6215132e2936c7b49bd25423b83dbec784c79894d4ff21","reason":"Same source body in authored semantic page"},{"oldId":"b-f75b8ac1da06cbf818f553e9","targetId":"b-f75b8ac1da06cbf818f553e9","page":"reading-opening","operation":"move","beforeSHA256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","afterSHA256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","reason":"Same source body in authored semantic page"}],"blocks":[{"id":"b-8999a84e284e5432e1cb6987","type":"h1","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-8999a84e284e5432e1cb6987","content":"# 同源、同类与负例不是同一回事","sha256":"f7e895722165c2af43405403560044ed922a644b90aff1174eb352c41bc309a7","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-36c0953a6a18d371ba748285","prerequisites":[{"id":"b-36c0953a6a18d371ba748285","url":"#b-36c0953a6a18d371ba748285","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-36c0953a6a18d371ba748285","type":"p","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-36c0953a6a18d371ba748285","content":"把同源关系与语义同类拆开。负例的定义要相对于训练题，不能直接等同于类别不同。","sha256":"3222212bf5cbe0eec589043390b2f51c1f3c6d3dbc43803192d2323e08ef9f46","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8999a84e284e5432e1cb6987","nextBlock":"b-c90c5e15f1ed70927dcc4cde","prerequisites":[{"id":"b-8999a84e284e5432e1cb6987","url":"#b-8999a84e284e5432e1cb6987","role":"section-title"}],"relatedBlocks":[]},{"id":"b-c90c5e15f1ed70927dcc4cde","type":"p","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-c90c5e15f1ed70927dcc4cde","content":"设A1、A2是同一红杯照片的两种裁剪，B1来自另一只红杯。实例对比通常把A1–A2配为正例，把B1作为A1的其他候选。即便A和B都属于“杯子”，取样过程也没有给它们同源身份。","sha256":"e05639d29c1e9d147bd2766dd00ecfe08ffbd85c314e20d84e2d2b50df476add","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-36c0953a6a18d371ba748285","nextBlock":"b-c11e61831e6335ba0a1a4f75","prerequisites":[{"id":"b-8999a84e284e5432e1cb6987","url":"#b-8999a84e284e5432e1cb6987","role":"section-title"},{"id":"b-36c0953a6a18d371ba748285","url":"#b-36c0953a6a18d371ba748285","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-c11e61831e6335ba0a1a4f75","type":"p","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-c11e61831e6335ba0a1a4f75","content":"这解释了“假负例”：在训练的实例身份题中，B确实不是A；在下游语义分类题中，B却可能应该与A接近。两种题目的答案并不矛盾，但会对表示施加不同压力。","sha256":"79f2869954760e92d4d6a1d5beb8c623a858a17af2434e1fe2d7d46464d9e58d","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-c90c5e15f1ed70927dcc4cde","nextBlock":"b-7c2ff5e0efa0bcccbbf3137a","prerequisites":[{"id":"b-8999a84e284e5432e1cb6987","url":"#b-8999a84e284e5432e1cb6987","role":"section-title"},{"id":"b-36c0953a6a18d371ba748285","url":"#b-36c0953a6a18d371ba748285","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-7c2ff5e0efa0bcccbbf3137a","type":"p","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-7c2ff5e0efa0bcccbbf3137a","content":"本页不要求学生寻找一条永远正确的相似度。先写清关系：同一原图、同一对象、同一类别、同一语句含义是不同层次。以后CLIP用图文配对时，也要重新问正例来自哪一种数据关系，不能沿用“看起来相似就是正例”的模糊定义。","sha256":"455418a5d87053a9ef6215132e2936c7b49bd25423b83dbec784c79894d4ff21","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-c11e61831e6335ba0a1a4f75","nextBlock":"b-f75b8ac1da06cbf818f553e9","prerequisites":[{"id":"b-8999a84e284e5432e1cb6987","url":"#b-8999a84e284e5432e1cb6987","role":"section-title"},{"id":"b-36c0953a6a18d371ba748285","url":"#b-36c0953a6a18d371ba748285","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-f75b8ac1da06cbf818f553e9","type":"h2","scope":"instance-positive-and-false-negative","url":"https://codingai-lec03.pages.dev/course/blocks/instance-positive-and-false-negative.html#b-f75b8ac1da06cbf818f553e9","content":"## 继续阅读与实验","sha256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-view-objective","title":"视图关系怎样成为学习目标，又会牺牲什么？"},"page":{"id":"reading-opening","title":"同源、同类与负例不是同一回事","number":1},"sectionTitle":"同源、同类与负例不是同一回事","currentQuestion":"同源、同类与负例不是同一回事","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-7c2ff5e0efa0bcccbbf3137a","nextBlock":null,"prerequisites":[{"id":"b-8999a84e284e5432e1cb6987","url":"#b-8999a84e284e5432e1cb6987","role":"section-title"},{"id":"b-36c0953a6a18d371ba748285","url":"#b-36c0953a6a18d371ba748285","role":"problem-context"}],"relatedBlocks":[]}]}