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重建需要什么限制，才不只是在复制？","sha256":"28bbaf93cf9f33571f8273df1a4f95d2f3edf2cceb31a438e2ea1e4c2da85eb8","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-18f51b247ae29b8ffeedafa7","prerequisites":[{"id":"b-18f51b247ae29b8ffeedafa7","url":"#b-18f51b247ae29b8ffeedafa7","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-18f51b247ae29b8ffeedafa7","type":"p","scope":"reconstruction-restrictions","url":"https://codingai-lec03.pages.dev/course/blocks/reconstruction-restrictions.html#b-18f51b247ae29b8ffeedafa7","content":"重建不是简单复制；瓶颈、破坏或遮挡为学习增加约束，和视图关系形成另一类目标。","sha256":"0e40e6b7ddba60e80820146d718202e65b5d313465f9bd031aaff21da87e26e6","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-f480bb78c1c1b634bbaf8fca","nextBlock":"b-07319e973bdb4812d35b5769","prerequisites":[{"id":"b-f480bb78c1c1b634bbaf8fca","url":"#b-f480bb78c1c1b634bbaf8fca","role":"section-title"}],"relatedBlocks":[]},{"id":"b-07319e973bdb4812d35b5769","type":"p","scope":"reconstruction-restrictions","url":"https://codingai-lec03.pages.dev/course/blocks/reconstruction-restrictions.html#b-07319e973bdb4812d35b5769","content":"如果把原图完整交给一个足够强的模型，再要求原样输出，复制就能得到零误差。重建作为表示学习目标，需要规定信息怎样通过：离散词典限制代码只能是一个索引，PCA限制在线性低维子空间，去噪自编码器限制只能看被破坏输入，MAE限制只看到部分位置。","sha256":"2a7352ae162cc54848f5cd04d92f833655452aed9f9a8cacdd856488c86af8ec","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-18f51b247ae29b8ffeedafa7","nextBlock":"b-ab7265cafe690f3eb06d3fda","prerequisites":[{"id":"b-f480bb78c1c1b634bbaf8fca","url":"#b-f480bb78c1c1b634bbaf8fca","role":"section-title"},{"id":"b-18f51b247ae29b8ffeedafa7","url":"#b-18f51b247ae29b8ffeedafa7","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-ab7265cafe690f3eb06d3fda","type":"p","scope":"reconstruction-restrictions","url":"https://codingai-lec03.pages.dev/course/blocks/reconstruction-restrictions.html#b-ab7265cafe690f3eb06d3fda","content":"这些限制迫使模型利用数据规律。反过来，跳连若把目标原样送到输出，或输入预处理意外泄漏被遮像素，就可能完成重建却绕过了希望训练的表示。","sha256":"4cc6d0100905291fb9d7a58e595d30bf8942125c225a79f050e264b469c44500","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-07319e973bdb4812d35b5769","nextBlock":"b-c7419c2098f66e2be30c0e31","prerequisites":[{"id":"b-f480bb78c1c1b634bbaf8fca","url":"#b-f480bb78c1c1b634bbaf8fca","role":"section-title"},{"id":"b-18f51b247ae29b8ffeedafa7","url":"#b-18f51b247ae29b8ffeedafa7","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-c7419c2098f66e2be30c0e31","type":"p","scope":"reconstruction-restrictions","url":"https://codingai-lec03.pages.dev/course/blocks/reconstruction-restrictions.html#b-c7419c2098f66e2be30c0e31","content":"本讲不要求先学完所有自编码器。沿“输入可见什么→中间表示允许什么→在哪些位置算误差”即可比较它们。LAB 05保留真实patch词典拟合，CLS 05给PCA与去噪推导，LAB 08再把重建和冻结读出接到同一图像实验。","sha256":"e44a265b4aca3522a0bba56e3354e110f2d23d450ab52f941c2274f307152ea1","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-ab7265cafe690f3eb06d3fda","nextBlock":"b-e07d5eebc0682a603ca491f2","prerequisites":[{"id":"b-f480bb78c1c1b634bbaf8fca","url":"#b-f480bb78c1c1b634bbaf8fca","role":"section-title"},{"id":"b-18f51b247ae29b8ffeedafa7","url":"#b-18f51b247ae29b8ffeedafa7","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-e07d5eebc0682a603ca491f2","type":"h2","scope":"reconstruction-restrictions","url":"https://codingai-lec03.pages.dev/course/blocks/reconstruction-restrictions.html#b-e07d5eebc0682a603ca491f2","content":"## 继续阅读与实验","sha256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","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":"reading-opening","title":"重建需要什么限制，才不只是在复制？","number":1},"sectionTitle":"重建需要什么限制，才不只是在复制？","currentQuestion":"重建需要什么限制，才不只是在复制？","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-c7419c2098f66e2be30c0e31","nextBlock":null,"prerequisites":[{"id":"b-f480bb78c1c1b634bbaf8fca","url":"#b-f480bb78c1c1b634bbaf8fca","role":"section-title"},{"id":"b-18f51b247ae29b8ffeedafa7","url":"#b-18f51b247ae29b8ffeedafa7","role":"problem-context"}],"relatedBlocks":[]}]}