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尺度跨度与两对象匹配](/course/notebooks/9315996660f54e92847770355b648f9e.html)","sha256":"962425885e26bc1e84f9788b6bdc0dd3408627135c1a8e3676b481715723b29f","chapter":{"id":"course","title":"同一组对象换了排列，损失不该凭空变大"},"unit":{"id":"notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5","title":"同一组对象换了排列，损失不该凭空变大"},"page":{"id":"reading-opening","title":"同一组对象换了排列，损失不该凭空变大","number":1},"sectionTitle":"同一组对象换了排列，损失不该凭空变大","currentQuestion":"同一组对象换了排列，损失不该凭空变大","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-f5ab6e51e26d58ea7a8b6634","prerequisites":[],"relatedBlocks":[]},{"id":"b-f5ab6e51e26d58ea7a8b6634","type":"h1","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5.html#b-f5ab6e51e26d58ea7a8b6634","content":"# 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[一张图怎样变成一组框](/course/study/image-detection.html) · [像素、边界与对象身份](/course/study/pixels-instances.html)。两个入口引用同一份现有材料，不需要重复阅读或运行。","sha256":"034b6112f93c03c81cf131a48ede9fb578c84ff87acad274fbb654923f4ba12b","chapter":{"id":"course","title":"同一组对象换了排列，损失不该凭空变大"},"unit":{"id":"notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5","title":"同一组对象换了排列，损失不该凭空变大"},"page":{"id":"reading-opening","title":"同一组对象换了排列，损失不该凭空变大","number":1},"sectionTitle":"同一组对象换了排列，损失不该凭空变大","currentQuestion":"同一组对象换了排列，损失不该凭空变大","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-7f05b56cf2c4387e21a39d1a","nextBlock":"b-74d8f04e109a79f76bdda9a4","prerequisites":[{"id":"b-f5ab6e51e26d58ea7a8b6634","url":"#b-f5ab6e51e26d58ea7a8b6634","role":"section-title"},{"id":"b-0280b9f721947f354ae66ab2","url":"#b-0280b9f721947f354ae66ab2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-74d8f04e109a79f76bdda9a4","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5.html#b-74d8f04e109a79f76bdda9a4","content":"本册只回答两个选读问题，不是 DETR 训练实验。看 [P38 的多尺度表示](/course/pages/l3-r2-p38.html) 时，可查目标在 stride 4/8/16/32 网格中的跨度；看 [P39 的对象身份](/course/pages/l3-r2-p39.html) 时，可查无序对象如何对应。","sha256":"2b01e3b98f6d8017e99d0668ce6dcd1b33ac5481049671a08714a8005c960020","chapter":{"id":"course","title":"同一组对象换了排列，损失不该凭空变大"},"unit":{"id":"notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5","title":"同一组对象换了排列，损失不该凭空变大"},"page":{"id":"reading-opening","title":"同一组对象换了排列，损失不该凭空变大","number":1},"sectionTitle":"同一组对象换了排列，损失不该凭空变大","currentQuestion":"同一组对象换了排列，损失不该凭空变大","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-257cedc8bd775dbdcea708ba","nextBlock":"b-616af1655fc3b8cb926e7d68","prerequisites":[{"id":"b-f5ab6e51e26d58ea7a8b6634","url":"#b-f5ab6e51e26d58ea7a8b6634","role":"section-title"},{"id":"b-0280b9f721947f354ae66ab2","url":"#b-0280b9f721947f354ae66ab2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-616af1655fc3b8cb926e7d68","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5.html#b-616af1655fc3b8cb926e7d68","content":"先看 [尺度跨度](/course/blocks/multiscale-architecture-comparison.html) 或 [由框与概率计算匹配](/course/blocks/set-matching-real-inputs.html)，再修改对应条件。匹配用类别概率、框 L1 与 IoU 构造代价，再穷举两个对象的排列；跨度和匹配解决不同问题。","sha256":"07039c013b314ff21a0cade9ba5bb95efb8a50f7883f7706f75ef2794d177855","chapter":{"id":"course","title":"同一组对象换了排列，损失不该凭空变大"},"unit":{"id":"notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5","title":"同一组对象换了排列，损失不该凭空变大"},"page":{"id":"reading-opening","title":"同一组对象换了排列，损失不该凭空变大","number":1},"sectionTitle":"同一组对象换了排列，损失不该凭空变大","currentQuestion":"同一组对象换了排列，损失不该凭空变大","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-74d8f04e109a79f76bdda9a4","nextBlock":"b-75ebfaf8bed4d0860c5bbb46","prerequisites":[{"id":"b-f5ab6e51e26d58ea7a8b6634","url":"#b-f5ab6e51e26d58ea7a8b6634","role":"section-title"},{"id":"b-0280b9f721947f354ae66ab2","url":"#b-0280b9f721947f354ae66ab2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-75ebfaf8bed4d0860c5bbb46","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5.html#b-75ebfaf8bed4d0860c5bbb46","content":"产出一个判断：交换预测槽顺序后，最小总成本是否不变？为什么小于一格不等于信息必定消失？读完回到 [CLS 08](https://deepnote.com/project/38755e4e-23f6-4f5f-8c68-8a2e4114b1c1/notebook/2d81e2a1936043349eacb71c53c0defa)；完整图像到框学习另见 [LAB 10](https://deepnote.com/project/38755e4e-23f6-4f5f-8c68-8a2e4114b1c1/notebook/a14237bfa9dd413d959ab4e458e11f42)。","sha256":"933fb07ec46fa465c33aff50bfb9969547b90d30ed8775d71768acd5290079dc","chapter":{"id":"course","title":"同一组对象换了排列，损失不该凭空变大"},"unit":{"id":"notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5","title":"同一组对象换了排列，损失不该凭空变大"},"page":{"id":"reading-opening","title":"同一组对象换了排列，损失不该凭空变大","number":1},"sectionTitle":"同一组对象换了排列，损失不该凭空变大","currentQuestion":"同一组对象换了排列，损失不该凭空变大","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-616af1655fc3b8cb926e7d68","nextBlock":"b-3ecc2b8a03ced6a282c73cd0","prerequisites":[{"id":"b-f5ab6e51e26d58ea7a8b6634","url":"#b-f5ab6e51e26d58ea7a8b6634","role":"section-title"},{"id":"b-0280b9f721947f354ae66ab2","url":"#b-0280b9f721947f354ae66ab2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-3ecc2b8a03ced6a282c73cd0","type":"h2","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/6ab1753a596940e5aceba3b7dd7537c5.html#b-3ecc2b8a03ced6a282c73cd0","content":"## 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Cᵢⱼ=−log 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