{"version":2,"relationshipURLBase":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html","relationshipResolution":"Resolve relative relationship URLs against relationshipURLBase; complete records and absolute URLs are in blocks.","title":"类别答案，不等于中间表示","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html","markdown":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.md","pages":[{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","unit":"训练留下什么，训练答案又从哪里来？","unitId":"i-reuse-and-targets","chapter":"I","number":1}],"aliases":[{"oldId":"explanation","targetId":"h-i-changing-the-readout","operation":"split-explanation-range"},{"oldId":"b-8f621387742f2c49a233cd5e","targetId":"b-8f621387742f2c49a233cd5e","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","afterSHA256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","reason":"Same source body in authored semantic page"},{"oldId":"b-a746c48f899f53bd9f000b74","targetId":"b-a746c48f899f53bd9f000b74","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"50184e6aecfb4c254d7ec8c6dec936637a3762bef1c1b12bc876883067a8f729","afterSHA256":"50184e6aecfb4c254d7ec8c6dec936637a3762bef1c1b12bc876883067a8f729","reason":"Same source body in authored semantic page"},{"oldId":"b-e39b7b9e549f5a2ec4f7568a","targetId":"b-e39b7b9e549f5a2ec4f7568a","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"26015feda2754cbf7593b55d6aafb5c1f36629a002b1fa01795f4f565f8f4e90","afterSHA256":"26015feda2754cbf7593b55d6aafb5c1f36629a002b1fa01795f4f565f8f4e90","reason":"Same source body in authored semantic page"},{"oldId":"b-9940559002a8dd85dc61938f","targetId":"b-9940559002a8dd85dc61938f","page":"h-i-changing-the-readout","operation":"rewrite","beforeSHA256":"eb19a51ef42e7871ca899104e6a6cc7f2e4cee8b15dfe5aedf97eaf9e201c5f9","afterSHA256":"ab6e37743e11ff8994e8c45217301374b5cf8876a09f8f09c19a0114dac40abe","reason":"Same source identity with figure semantics or reading context enriched"},{"oldId":"b-437d62c0c98bb79942c754d7","targetId":"b-437d62c0c98bb79942c754d7","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","afterSHA256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","reason":"Same source body in authored semantic page"},{"oldId":"b-ab238b7f501711f84b4e0cd6","targetId":"b-ab238b7f501711f84b4e0cd6","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"1d8b0b9d493e326fd540c2b5413bb4ac7b835457eda988979d2812507a13d6a9","afterSHA256":"1d8b0b9d493e326fd540c2b5413bb4ac7b835457eda988979d2812507a13d6a9","reason":"Same source body in authored semantic page"},{"oldId":"b-423a70cfe9fb60b17b258a78","targetId":"b-423a70cfe9fb60b17b258a78","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"5f1bb21cfb7b10389298fba5a8199962306605d5e32cdd0fe54c6ee6ccd68ee3","afterSHA256":"5f1bb21cfb7b10389298fba5a8199962306605d5e32cdd0fe54c6ee6ccd68ee3","reason":"Same source body in authored semantic page"},{"oldId":"b-d89ab22bf7c720214528da97","targetId":"b-d89ab22bf7c720214528da97","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"80f46bf9ef95db9fbcdc3734c6cc7e132bc4c38cb1855499b861b27c19233523","afterSHA256":"80f46bf9ef95db9fbcdc3734c6cc7e132bc4c38cb1855499b861b27c19233523","reason":"Same source body in authored semantic page"},{"oldId":"b-fb91de9a8912b50d1b33d073","targetId":"b-fb91de9a8912b50d1b33d073","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"85687d40f8274b83ef40cac3f1d86f3623be2391c37f73e7cc0184e6edc689dd","afterSHA256":"85687d40f8274b83ef40cac3f1d86f3623be2391c37f73e7cc0184e6edc689dd","reason":"Same source body in authored semantic page"},{"oldId":"b-4955d84799a11d51ff32b248","targetId":"b-4955d84799a11d51ff32b248","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"6c59a5f364706442d4af4ed926284a34a4ccfd37f156f57c0d0cad464c41f962","afterSHA256":"6c59a5f364706442d4af4ed926284a34a4ccfd37f156f57c0d0cad464c41f962","reason":"Same source body in authored semantic page"},{"oldId":"b-52b71ee6ed8acc0596309ec3","targetId":"b-52b71ee6ed8acc0596309ec3","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","afterSHA256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","reason":"Same source body in authored semantic page"},{"oldId":"b-4baa9e500f4bb34b45ae4bca","targetId":"b-4baa9e500f4bb34b45ae4bca","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"e99eea884b594a3abfc561f586fcb9a1a993b3b92d1bd2d2057078632ea5c03f","afterSHA256":"e99eea884b594a3abfc561f586fcb9a1a993b3b92d1bd2d2057078632ea5c03f","reason":"Same source body in authored semantic page"},{"oldId":"b-9a55e9dfbf761ff3fff1c21c","targetId":"b-9a55e9dfbf761ff3fff1c21c","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","afterSHA256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","reason":"Same source body in authored semantic page"},{"oldId":"b-15eafba025d49d01762d6808","targetId":"b-15eafba025d49d01762d6808","page":"h-i-changing-the-readout","operation":"move","beforeSHA256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","afterSHA256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","reason":"Same source body in authored semantic page"},{"oldId":"h-i-changing-the-readout-title","targetId":"b-478ec060f692723479ea00d9","operation":"retain-source-identity"}],"blocks":[{"id":"b-478ec060f692723479ea00d9","type":"h2","scope":"h-i-changing-the-readout","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-478ec060f692723479ea00d9","content":"## 换掉分类头，为新问题留下什么","sha256":"f65b40b254637a7b9b427d48dffd244ebb3df80323f6f3f47e816e0b8b232496","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-8f621387742f2c49a233cd5e","prerequisites":[{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-8f621387742f2c49a233cd5e","type":"h2","scope":"explanation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-8f621387742f2c49a233cd5e","content":"## 解释、算例与证据","sha256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-478ec060f692723479ea00d9","nextBlock":"b-a746c48f899f53bd9f000b74","prerequisites":[{"id":"b-478ec060f692723479ea00d9","url":"#b-478ec060f692723479ea00d9","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-a746c48f899f53bd9f000b74","type":"h1","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-a746c48f899f53bd9f000b74","content":"# P02 · 类别答案，不等于中间表示","sha256":"50184e6aecfb4c254d7ec8c6dec936637a3762bef1c1b12bc876883067a8f729","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-8f621387742f2c49a233cd5e","nextBlock":"b-e39b7b9e549f5a2ec4f7568a","prerequisites":[{"id":"b-8f621387742f2c49a233cd5e","url":"#b-8f621387742f2c49a233cd5e","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-e39b7b9e549f5a2ec4f7568a","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-e39b7b9e549f5a2ec4f7568a","content":"本页拆开最终类别判断和中间表示，避免把“预测对了一个类别”当成已经回答了所有问题。","sha256":"26015feda2754cbf7593b55d6aafb5c1f36629a002b1fa01795f4f565f8f4e90","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a746c48f899f53bd9f000b74","nextBlock":"b-9940559002a8dd85dc61938f","prerequisites":[{"id":"b-a746c48f899f53bd9f000b74","url":"#b-a746c48f899f53bd9f000b74","role":"section-title"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-9940559002a8dd85dc61938f","type":"figure","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-9940559002a8dd85dc61938f","content":"图内标签与数值：P02 学习表示机制图，状态 1；视觉网络 f；中间表示 h；原类别头；杯子 / 书 / …；新任务头；新标签 + 训练 + 评价；也可继续调整原网络；保留视觉计算与参数，是迁移的起点；新任务的答案仍需学习。\n\n图片经过视觉网络得到空间特征，中间表示分别连接原类别头和新任务头；虚线示意继续调整网络。\n\n- 视觉网络 f\n- 中间表示 h\n- 原类别头\n- 杯子 / 书 / …\n- 新任务头\n- 新标签 + 训练 + 评价\n- 也可继续调整原网络\n- 保留视觉计算与参数，是迁移的起点；新任务的答案仍需学习。图片经过视觉网络得到空间特征，中间表示分别连接原类别头和新任务头；虚线示意继续调整网络。 [查看对应图解状态](/#/l3-r2-p02/0)[查看完整图解](/course/figures/l3-r2-p02-0.html)","sha256":"ab6e37743e11ff8994e8c45217301374b5cf8876a09f8f09c19a0114dac40abe","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"图片经过视觉网络得到空间特征，中间表示分别连接原类别头和新任务头；虚线示意继续调整网络。 查看对应图解状态","labels":["视觉网络 f","中间表示 h","原类别头","杯子 / 书 / …","新任务头","新标签 + 训练 + 评价","也可继续调整原网络","保留视觉计算与参数，是迁移的起点；新任务的答案仍需学习。"],"description":"图片经过视觉网络得到空间特征，中间表示分别连接原类别头和新任务头；虚线示意继续调整网络。视觉网络 f中间表示 h原类别头杯子 / 书 / …新任务头新标签 + 训练 + 评价也可继续调整原网络保留视觉计算与参数，是迁移的起点；新任务的答案仍需学习。","evidenceIdentity":"图片经过视觉网络得到空间特征，中间表示分别连接原类别头和新任务头；虚线示意继续调整网络。 查看对应图解状态","images":[{"src":"/assets/display/584c419ba431799ff41df983.webp","alt":""}]},"previousBlock":"b-e39b7b9e549f5a2ec4f7568a","nextBlock":"b-437d62c0c98bb79942c754d7","prerequisites":[{"id":"b-a746c48f899f53bd9f000b74","url":"#b-a746c48f899f53bd9f000b74","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-437d62c0c98bb79942c754d7","type":"h2","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-437d62c0c98bb79942c754d7","content":"## 课堂讲述","sha256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-9940559002a8dd85dc61938f","nextBlock":"b-ab238b7f501711f84b4e0cd6","prerequisites":[{"id":"b-a746c48f899f53bd9f000b74","url":"#b-a746c48f899f53bd9f000b74","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-ab238b7f501711f84b4e0cd6","type":"p","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-ab238b7f501711f84b4e0cd6","content":"回到我们已经认识的分类器。图片经过网络，先得到中间特征，再由最后的分类部分给出分数。训练时，它们一起为类别预测服务，但训练后，这两个部分的用途可以不同。\n最后一层很贴近原来的类别集合。中间特征却可能同时包含边缘、纹理、部件以及它们的组合。我们可以保留这些计算和参数，为新任务训练新的读出部分，也可以继续调整原网络。这就是迁移的起点。\n这里先把一个容易混淆的概念说清：有监督训练也能得到可迁移表示。今天接着讲自监督，不是因为监督表示不能迁移，而是要问：得到这些表示，是否必须始终依赖逐张图片的人工类别答案？","sha256":"1d8b0b9d493e326fd540c2b5413bb4ac7b835457eda988979d2812507a13d6a9","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-437d62c0c98bb79942c754d7","nextBlock":"b-423a70cfe9fb60b17b258a78","prerequisites":[{"id":"b-437d62c0c98bb79942c754d7","url":"#b-437d62c0c98bb79942c754d7","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-423a70cfe9fb60b17b258a78","type":"h3","scope":"category-head-versus-representation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-423a70cfe9fb60b17b258a78","content":"### 丢掉分类头，究竟还剩下什么？","sha256":"5f1bb21cfb7b10389298fba5a8199962306605d5e32cdd0fe54c6ee6ccd68ee3","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"丢掉分类头，究竟还剩下什么？","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":"category-head-versus-representation","formulas":[],"previousBlock":"b-ab238b7f501711f84b4e0cd6","nextBlock":"b-d89ab22bf7c720214528da97","prerequisites":[{"id":"b-437d62c0c98bb79942c754d7","url":"#b-437d62c0c98bb79942c754d7","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"},{"id":"b-d89ab22bf7c720214528da97","url":"#b-d89ab22bf7c720214528da97","relation":"same-reasoning"},{"id":"b-fb91de9a8912b50d1b33d073","url":"#b-fb91de9a8912b50d1b33d073","relation":"same-reasoning"},{"id":"b-4955d84799a11d51ff32b248","url":"#b-4955d84799a11d51ff32b248","relation":"same-reasoning"}]},{"id":"b-d89ab22bf7c720214528da97","type":"p","scope":"category-head-versus-representation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-d89ab22bf7c720214528da97","content":"一个十分类头可以把 32 维表示压成十个分数。最高分只保留最终决策，完整分数还保留类别间相对偏好；但两者都经过了为原任务学习的投影。若新任务需要原十类名单之外的区分，直接使用这些分数未必合适。","sha256":"80f46bf9ef95db9fbcdc3734c6cc7e132bc4c38cb1855499b861b27c19233523","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"丢掉分类头，究竟还剩下什么？","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":"category-head-versus-representation","formulas":[],"previousBlock":"b-423a70cfe9fb60b17b258a78","nextBlock":"b-fb91de9a8912b50d1b33d073","prerequisites":[{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"},{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","relation":"same-reasoning"},{"id":"b-fb91de9a8912b50d1b33d073","url":"#b-fb91de9a8912b50d1b33d073","relation":"same-reasoning"},{"id":"b-4955d84799a11d51ff32b248","url":"#b-4955d84799a11d51ff32b248","relation":"same-reasoning"}]},{"id":"b-fb91de9a8912b50d1b33d073","type":"p","scope":"category-head-versus-representation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-fb91de9a8912b50d1b33d073","content":"以数字为例，源任务是 0–9 十分类，新任务是“数字是否大于等于5”。最简单的做法可以先识别数字再合并类别，也可以在中间表示上另学二分类头。这两种使用方式的误差来源不同：前者受原十分类错误约束，后者可以重新组合中间特征。LAB01 采用后者，并明确丢弃原十分类头。","sha256":"85687d40f8274b83ef40cac3f1d86f3623be2391c37f73e7cc0184e6edc689dd","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"丢掉分类头，究竟还剩下什么？","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":"category-head-versus-representation","formulas":[],"previousBlock":"b-d89ab22bf7c720214528da97","nextBlock":"b-4955d84799a11d51ff32b248","prerequisites":[{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"},{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","relation":"same-reasoning"},{"id":"b-d89ab22bf7c720214528da97","url":"#b-d89ab22bf7c720214528da97","relation":"same-reasoning"},{"id":"b-4955d84799a11d51ff32b248","url":"#b-4955d84799a11d51ff32b248","relation":"same-reasoning"}]},{"id":"b-4955d84799a11d51ff32b248","type":"p","scope":"category-head-versus-representation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-4955d84799a11d51ff32b248","content":"“中间表示更通用”是值得检验的经验判断，不是说它保存了原图的一切。后面的颜色例子会展示，训练目标也可能让中间表示放弃未来有用的差异。","sha256":"6c59a5f364706442d4af4ed926284a34a4ccfd37f156f57c0d0cad464c41f962","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"丢掉分类头，究竟还剩下什么？","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":"category-head-versus-representation","formulas":[],"previousBlock":"b-fb91de9a8912b50d1b33d073","nextBlock":"b-52b71ee6ed8acc0596309ec3","prerequisites":[{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"},{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","relation":"same-reasoning"},{"id":"b-d89ab22bf7c720214528da97","url":"#b-d89ab22bf7c720214528da97","relation":"same-reasoning"},{"id":"b-fb91de9a8912b50d1b33d073","url":"#b-fb91de9a8912b50d1b33d073","relation":"same-reasoning"}]},{"id":"b-52b71ee6ed8acc0596309ec3","type":"h2","scope":"practice","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-52b71ee6ed8acc0596309ec3","content":"## 沿这个问题继续","sha256":"cf44fcc62782fb4f6bdc42c16c5187d57556a03cb7ce6065e7bd9c36d8e7d733","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-4955d84799a11d51ff32b248","nextBlock":"b-4baa9e500f4bb34b45ae4bca","prerequisites":[{"id":"b-423a70cfe9fb60b17b258a78","url":"#b-423a70cfe9fb60b17b258a78","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-4baa9e500f4bb34b45ae4bca","type":"p","scope":"practice","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-4baa9e500f4bb34b45ae4bca","content":"接读LAB 01固定32维特征的定义，再到P23看同一特征如何接两种读出。","sha256":"e99eea884b594a3abfc561f586fcb9a1a993b3b92d1bd2d2057078632ea5c03f","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-52b71ee6ed8acc0596309ec3","nextBlock":"b-c21240d31511457b5dc5b1b2","prerequisites":[{"id":"b-52b71ee6ed8acc0596309ec3","url":"#b-52b71ee6ed8acc0596309ec3","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-c21240d31511457b5dc5b1b2","type":"h4","scope":"retained-reading","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-c21240d31511457b5dc5b1b2","content":"#### 这条线索的展开与后续阅读","sha256":"48b8229f7559b36ed4d5628416e3991e5c73293fbce43374db67386c8736f3bc","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-4baa9e500f4bb34b45ae4bca","nextBlock":"b-9a55e9dfbf761ff3fff1c21c","prerequisites":[{"id":"b-52b71ee6ed8acc0596309ec3","url":"#b-52b71ee6ed8acc0596309ec3","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-9a55e9dfbf761ff3fff1c21c","type":"ul","scope":"retained-reading","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-9a55e9dfbf761ff3fff1c21c","content":"- [我们已经会更新网络，答案从哪里来？](/supplement.html?return=l3-r2-p02/0#/l3-recap/0) 本页说明","sha256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-c21240d31511457b5dc5b1b2","nextBlock":"b-15eafba025d49d01762d6808","prerequisites":[{"id":"b-c21240d31511457b5dc5b1b2","url":"#b-c21240d31511457b5dc5b1b2","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]},{"id":"b-15eafba025d49d01762d6808","type":"li","scope":"retained-reading","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p02.html#b-15eafba025d49d01762d6808","content":"- [我们已经会更新网络，答案从哪里来？](/supplement.html?return=l3-r2-p02/0#/l3-recap/0) 本页说明","sha256":"c05078553f35f2f2937dbbaf83714242e8fcfe945cb71aebffbbbd75bdc00cca","chapter":{"id":"I","title":"学习信号与表示"},"unit":{"id":"i-reuse-and-targets","title":"训练留下什么，训练答案又从哪里来？"},"page":{"id":"h-i-changing-the-readout","title":"换掉分类头，为新问题留下什么","number":1},"sectionTitle":"换掉分类头，为新问题留下什么","currentQuestion":"训练留下什么，训练答案又从哪里来？","sourceSlides":["l3-r2-p02"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-9a55e9dfbf761ff3fff1c21c","nextBlock":null,"prerequisites":[{"id":"b-c21240d31511457b5dc5b1b2","url":"#b-c21240d31511457b5dc5b1b2","role":"section-title"},{"id":"b-e39b7b9e549f5a2ec4f7568a","url":"#b-e39b7b9e549f5a2ec4f7568a","role":"problem-context"}],"relatedBlocks":[{"id":"b-9940559002a8dd85dc61938f","url":"#b-9940559002a8dd85dc61938f","relation":"figure-and-explanation"}]}]}