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$A=[[1,0],[1,0]]$，乙 $B=[[0,1],[0,1]]$。如果编码器只取整体均值，$f(A)=f(B)=.5$。进一步固定框坐标、其他特征与读出参数，且读出不能再访问原图，那么对任何确定性函数 g，都有 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.5 复制为 4×4，或给同一个数做插值，都是对同样输入施加同样函数；结果仍无法告诉我们亮在左边还是右边。","sha256":"e77e8ad77aa56049b6fb8247fda69458bb1544e738be5d381781019ffb534dd2","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-information-preservation","title":"瓶颈是读错位置，还是差别根本没有保留？"},"page":{"id":"reading-opening","title":"两个输入一旦碰撞，确定性读出为何无法分开","number":1},"sectionTitle":"两个输入一旦碰撞，确定性读出为何无法分开","currentQuestion":"两个输入一旦碰撞，确定性读出为何无法分开","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-3ecd4f016ca2cd0aced70fc5","nextBlock":"b-ad591d9d612ebec6783b07cc","prerequisites":[{"id":"b-7e6764443c876e3536a3534d","url":"#b-7e6764443c876e3536a3534d","role":"section-title"},{"id":"b-3a00410c3450e5d7fd71a0be","url":"#b-3a00410c3450e5d7fd71a0be","role":"problem-context"}],"relatedBlocks":[{"id":"b-a016b3e6d29eb7d7e62dd1e2","url":"#b-a016b3e6d29eb7d7e62dd1e2","relation":"figure-and-explanation"}]},{"id":"b-ad591d9d612ebec6783b07cc","type":"p","scope":"representation-collision-proof","url":"https://codingai-lec03.pages.dev/course/blocks/representation-collision-proof.html#b-ad591d9d612ebec6783b07cc","content":"若允许随机性，同样条件下也只能得到相同的输出分布。偶尔猜对其中一个，并没有建立随输入布局变化而变化的判断。要系统地区分，就要重新提供差别：改变编码器保留的信息、引入另一层特征、允许回看原图，或给出不同的外部条件。","sha256":"3d80b9ffcb056ac171153d7e1ef1eb3ad3c5e3d63645eab0b9ddd628ac06925a","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-information-preservation","title":"瓶颈是读错位置，还是差别根本没有保留？"},"page":{"id":"reading-opening","title":"两个输入一旦碰撞，确定性读出为何无法分开","number":1},"sectionTitle":"两个输入一旦碰撞，确定性读出为何无法分开","currentQuestion":"两个输入一旦碰撞，确定性读出为何无法分开","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-59386d446ef3fdd97ab9fe66","nextBlock":"b-6a5bde1ae3eeb9023083d8f9","prerequisites":[{"id":"b-7e6764443c876e3536a3534d","url":"#b-7e6764443c876e3536a3534d","role":"section-title"},{"id":"b-3a00410c3450e5d7fd71a0be","url":"#b-3a00410c3450e5d7fd71a0be","role":"problem-context"}],"relatedBlocks":[{"id":"b-a016b3e6d29eb7d7e62dd1e2","url":"#b-a016b3e6d29eb7d7e62dd1e2","relation":"figure-and-explanation"}]},{"id":"b-6a5bde1ae3eeb9023083d8f9","type":"p","scope":"representation-collision-proof","url":"https://codingai-lec03.pages.dev/course/blocks/representation-collision-proof.html#b-6a5bde1ae3eeb9023083d8f9","content":"题设没有证明真实粗特征普遍只等于均值，更没有推翻 RoIAlign 的完整模型结果。它是在迫使我们说清：性能瓶颈究竟是“已有信息读错位置”，还是“需要的信息根本没有保留”。","sha256":"3de609c492ec57041f21576d7d8f5f74cfe093c085b75f1ea22b5d56980ed070","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-information-preservation","title":"瓶颈是读错位置，还是差别根本没有保留？"},"page":{"id":"reading-opening","title":"两个输入一旦碰撞，确定性读出为何无法分开","number":1},"sectionTitle":"两个输入一旦碰撞，确定性读出为何无法分开","currentQuestion":"两个输入一旦碰撞，确定性读出为何无法分开","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-ad591d9d612ebec6783b07cc","nextBlock":"b-a016b3e6d29eb7d7e62dd1e2","prerequisites":[{"id":"b-7e6764443c876e3536a3534d","url":"#b-7e6764443c876e3536a3534d","role":"section-title"},{"id":"b-3a00410c3450e5d7fd71a0be","url":"#b-3a00410c3450e5d7fd71a0be","role":"problem-context"}],"relatedBlocks":[{"id":"b-a016b3e6d29eb7d7e62dd1e2","url":"#b-a016b3e6d29eb7d7e62dd1e2","relation":"figure-and-explanation"}]},{"id":"b-a016b3e6d29eb7d7e62dd1e2","type":"figure","scope":"representation-collision-proof","url":"https://codingai-lec03.pages.dev/course/blocks/representation-collision-proof.html#b-a016b3e6d29eb7d7e62dd1e2","content":"图内标签与数值：Lecture 03 课堂图解 P44；A：亮在左列；1；0；1；0；B：亮在右列；0；1；0；1；整体均值；(1+0+1+0)/4；整体均值；(0+1+0+1)/4；0.5；0.5；左右不同；均值却相同\n\n两个布局变成同一个 .5，输出放大并未增加用于区分的信息。 查看对应图解状态\n\n- A：亮在左列\n- 1\n- 0\n- 1\n- 0\n- B：亮在右列\n- 0\n- 1\n- 0\n- 1\n- 整体均值\n- (1+0+1+0)/4\n- 整体均值\n- (0+1+0+1)/4\n- 0.5\n- 0.5\n- 左右不同\n- 均值却相同两个布局变成同一个 .5，输出放大并未增加用于区分的信息。 [查看对应图解状态](/#/l3-r2-p44/0)[查看完整图解](/#/l3-r2-p44/0)","sha256":"11aa804765085014ed22f3398fcf92b5649676062bb5f81c8b12468c05708ec4","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-information-preservation","title":"瓶颈是读错位置，还是差别根本没有保留？"},"page":{"id":"reading-opening","title":"两个输入一旦碰撞，确定性读出为何无法分开","number":1},"sectionTitle":"两个输入一旦碰撞，确定性读出为何无法分开","currentQuestion":"两个输入一旦碰撞，确定性读出为何无法分开","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"两个布局变成同一个 .5，输出放大并未增加用于区分的信息。 查看对应图解状态","labels":["A：亮在左列","1","0","1","0","B：亮在右列","0","1","0","1","整体均值","(1+0+1+0)/4","整体均值","(0+1+0+1)/4","0.5","0.5","左右不同","均值却相同"],"description":"两个布局变成同一个 .5，输出放大并未增加用于区分的信息。 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继续阅读与实验","sha256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"spatial-information-preservation","title":"瓶颈是读错位置，还是差别根本没有保留？"},"page":{"id":"reading-opening","title":"两个输入一旦碰撞，确定性读出为何无法分开","number":1},"sectionTitle":"两个输入一旦碰撞，确定性读出为何无法分开","currentQuestion":"两个输入一旦碰撞，确定性读出为何无法分开","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a016b3e6d29eb7d7e62dd1e2","nextBlock":null,"prerequisites":[{"id":"b-7e6764443c876e3536a3534d","url":"#b-7e6764443c876e3536a3534d","role":"section-title"},{"id":"b-3a00410c3450e5d7fd71a0be","url":"#b-3a00410c3450e5d7fd71a0be","role":"problem-context"}],"relatedBlocks":[{"id":"b-a016b3e6d29eb7d7e62dd1e2","url":"#b-a016b3e6d29eb7d7e62dd1e2","relation":"figure-and-explanation"}]}]}