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$v=t(x)$ 与 $v^+=t'(x)$。知道它们来自同一个 $x$，是数据管线提供的身份信息；它不是模型事先认出了杯子。训练目标要求两张观察在表示空间仍能互相找到。","sha256":"f7dd0252510fbea40f6269f5244d7031cb7d6baf8836a3c4929a13d7fdbbd85a","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":"同源视图为什么能当作正例？","number":1},"sectionTitle":"同源视图为什么能当作正例？","currentQuestion":"同源视图为什么能当作正例？","sourceSlides":[],"knowledgeBlock":null,"formulas":[{"latex":"v=t(x)","definitionContext":"同源视图为什么能当作正例？"},{"latex":"v^+=t'(x)","definitionContext":"同源视图为什么能当作正例？"},{"latex":"x","definitionContext":"同源视图为什么能当作正例？"}],"previousBlock":"b-b32082367c5435b3d9ef7d68","nextBlock":"b-2aab7d962fef23c369395f13","prerequisites":[{"id":"b-e1cac20393359d16d0de8198","url":"#b-e1cac20393359d16d0de8198","role":"section-title"},{"id":"b-b32082367c5435b3d9ef7d68","url":"#b-b32082367c5435b3d9ef7d68","role":"problem-context"}],"relatedBlocks":[{"id":"b-6d66dc7d8d7ff9289134d314","url":"#b-6d66dc7d8d7ff9289134d314","relation":"figure-and-explanation"}]},{"id":"b-2aab7d962fef23c369395f13","type":"p","scope":"paired-views-as-a-task","url":"https://codingai-lec03.pages.dev/course/blocks/paired-views-as-a-task.html#b-2aab7d962fef23c369395f13","content":"若两张裁剪分别改变背景和亮度，但都保留杯身，完成配对就可能需要抓住跨视图共有的轮廓和部件，而不能只记某个像素位置。这是视图训练有机会产生可迁移特征的理由。","sha256":"7b83c8d739173f33de743dd8186c8498f11e6ba51f24284d74a4cf4bb7cd2f3a","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":"同源视图为什么能当作正例？","number":1},"sectionTitle":"同源视图为什么能当作正例？","currentQuestion":"同源视图为什么能当作正例？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-058f537fd01d231ebd258562","nextBlock":"b-7e628ca29cacb969a92c1e7c","prerequisites":[{"id":"b-e1cac20393359d16d0de8198","url":"#b-e1cac20393359d16d0de8198","role":"section-title"},{"id":"b-b32082367c5435b3d9ef7d68","url":"#b-b32082367c5435b3d9ef7d68","role":"problem-context"}],"relatedBlocks":[{"id":"b-6d66dc7d8d7ff9289134d314","url":"#b-6d66dc7d8d7ff9289134d314","relation":"figure-and-explanation"}]},{"id":"b-7e628ca29cacb969a92c1e7c","type":"p","scope":"paired-views-as-a-task","url":"https://codingai-lec03.pages.dev/course/blocks/paired-views-as-a-task.html#b-7e628ca29cacb969a92c1e7c","content":"但正例规则也施加了假设：如果一张只剩杯子、另一张只剩无关书本，我们仍知道它们同源，却未必给出了理想的语义一致性任务。增强不是越强越好；要问它留下了哪些共有证据，又要求模型忽略哪些差异。","sha256":"c09cbf696f55a7a883e5d5cebabf85a40da56f896bc6679f12246b7f34ff2c23","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":"同源视图为什么能当作正例？","number":1},"sectionTitle":"同源视图为什么能当作正例？","currentQuestion":"同源视图为什么能当作正例？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-2aab7d962fef23c369395f13","nextBlock":"b-6d66dc7d8d7ff9289134d314","prerequisites":[{"id":"b-e1cac20393359d16d0de8198","url":"#b-e1cac20393359d16d0de8198","role":"section-title"},{"id":"b-b32082367c5435b3d9ef7d68","url":"#b-b32082367c5435b3d9ef7d68","role":"problem-context"}],"relatedBlocks":[{"id":"b-6d66dc7d8d7ff9289134d314","url":"#b-6d66dc7d8d7ff9289134d314","relation":"figure-and-explanation"}]},{"id":"b-6d66dc7d8d7ff9289134d314","type":"figure","scope":"paired-views-as-a-task","url":"https://codingai-lec03.pages.dev/course/blocks/paired-views-as-a-task.html#b-6d66dc7d8d7ff9289134d314","content":"图内标签与数值：P08 学习表示机制图，状态 1；同一底图 x；视图 a；固定裁剪 1；杯身 + 桌面；视图 b；固定裁剪 2；仍包含同一杯子；两个视图共享原图，不额外需要类别名；裁剪坐标由代码固定；不是两张独立生成的图片。\n\n两张裁剪来自同一底图，正例身份由取样过程给出。 查看对应图解状态\n\n- 同一底图 x\n- 视图 a\n- 固定裁剪 1\n- 杯身 + 桌面\n- 视图 b\n- 固定裁剪 2\n- 仍包含同一杯子\n- 两个视图共享原图，不额外需要类别名\n- 裁剪坐标由代码固定；不是两张独立生成的图片。两张裁剪来自同一底图，正例身份由取样过程给出。 [查看对应图解状态](/#/l3-r2-p08/0)[查看完整图解](/#/l3-r2-p08/0)","sha256":"1697065b90af45b04fd0628479b49eb786213e1351119065a581336c1d13a1c4","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":"同源视图为什么能当作正例？","number":1},"sectionTitle":"同源视图为什么能当作正例？","currentQuestion":"同源视图为什么能当作正例？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"两张裁剪来自同一底图，正例身份由取样过程给出。 查看对应图解状态","labels":["同一底图 x","视图 a","固定裁剪 1","杯身 + 桌面","视图 b","固定裁剪 2","仍包含同一杯子","两个视图共享原图，不额外需要类别名","裁剪坐标由代码固定；不是两张独立生成的图片。"],"description":"两张裁剪来自同一底图，正例身份由取样过程给出。 查看对应图解状态同一底图 x视图 a固定裁剪 1杯身 + 桌面视图 b固定裁剪 2仍包含同一杯子两个视图共享原图，不额外需要类别名裁剪坐标由代码固定；不是两张独立生成的图片。","evidenceIdentity":"两张裁剪来自同一底图，正例身份由取样过程给出。 查看对应图解状态","images":[{"src":"/assets/display/9a66faeae8dd2c354bc56482.webp","alt":""},{"src":"/assets/display/9a66faeae8dd2c354bc56482.webp","alt":""},{"src":"/assets/display/9a66faeae8dd2c354bc56482.webp","alt":""}]},"previousBlock":"b-7e628ca29cacb969a92c1e7c","nextBlock":"b-052a5468cf7eed36d6d8e74b","prerequisites":[{"id":"b-e1cac20393359d16d0de8198","url":"#b-e1cac20393359d16d0de8198","role":"section-title"},{"id":"b-b32082367c5435b3d9ef7d68","url":"#b-b32082367c5435b3d9ef7d68","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-052a5468cf7eed36d6d8e74b","type":"h2","scope":"paired-views-as-a-task","url":"https://codingai-lec03.pages.dev/course/blocks/paired-views-as-a-task.html#b-052a5468cf7eed36d6d8e74b","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":"同源视图为什么能当作正例？","number":1},"sectionTitle":"同源视图为什么能当作正例？","currentQuestion":"同源视图为什么能当作正例？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-6d66dc7d8d7ff9289134d314","nextBlock":null,"prerequisites":[{"id":"b-e1cac20393359d16d0de8198","url":"#b-e1cac20393359d16d0de8198","role":"section-title"},{"id":"b-b32082367c5435b3d9ef7d68","url":"#b-b32082367c5435b3d9ef7d68","role":"problem-context"}],"relatedBlocks":[{"id":"b-6d66dc7d8d7ff9289134d314","url":"#b-6d66dc7d8d7ff9289134d314","relation":"figure-and-explanation"}]}]}