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GT","1/2","1","FP"]]},"previousBlock":"b-acf99a5aba4d4892b9ce7375","nextBlock":"b-49e939d01cadaad63881334a","prerequisites":[{"id":"b-1ec2ad5df7b831334e9bd17f","url":"#b-1ec2ad5df7b831334e9bd17f","role":"section-title"},{"id":"b-f9e4c26272a3da8e2634eed2","url":"#b-f9e4c26272a3da8e2634eed2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-49e939d01cadaad63881334a","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/8eced6ce67e84d02929cf23760a5eb09.html#b-49e939d01cadaad63881334a","content":"P2 不是因为框“不够像”而成为 FP；P3 在 AP75 中也不是因为分数低而失败。两类错误分别来自重复输出和定位精度。代码逐预测保存原因、匹配对象、累计 TP/FP、precision 与 recall，不能只凭最后一个 recall 代替 AP。","sha256":"ec42f52f300e017f976cda1af5c4bd1d6d6c4af90617bc422902888b59ab2760","chapter":{"id":"course","title":"3 · 评价先降序，再限制同一 GT 只用一次"},"unit":{"id":"notebook-blocks/8eced6ce67e84d02929cf23760a5eb09","title":"3 · 评价先降序，再限制同一 GT 只用一次"},"page":{"id":"reading-opening","title":"3 · 评价先降序，再限制同一 GT 只用一次","number":1},"sectionTitle":"3 · 评价先降序，再限制同一 GT 只用一次","currentQuestion":"3 · 评价先降序，再限制同一 GT 只用一次","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-9b62a0af46bbc7e7b1e1dfe5","nextBlock":"b-9dc31f5c27f4fa524198eaaf","prerequisites":[{"id":"b-1ec2ad5df7b831334e9bd17f","url":"#b-1ec2ad5df7b831334e9bd17f","role":"section-title"},{"id":"b-f9e4c26272a3da8e2634eed2","url":"#b-f9e4c26272a3da8e2634eed2","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-9dc31f5c27f4fa524198eaaf","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/8eced6ce67e84d02929cf23760a5eb09.html#b-9dc31f5c27f4fa524198eaaf","content":"**协议不能混用。**另一种规则是“先排除已用 GT，再选剩余 IoU 最大者”，它在重叠对象场景可能给出不同结果。取 GT1=`(0,0,2,2)`、GT2=`(0.5,0,2.5,2)`，预测 P1、P2 **都完全复制 GT1**，两预测对 GT 的 IoU 行均为 `[1.0, 0.6]`。在 IoU 阈值 0.50 下：","sha256":"096818f0a207394945eb2fac232b6319100606e3c51d27539f8c5924e8418e83","chapter":{"id":"course","title":"3 · 评价先降序，再限制同一 GT 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GT，再找最佳 | TP→GT1 | TP→GT2，IoU=0.6 | 1.0 | 1.0 |","sha256":"e9eeb83a8390c9faa218454e7b9cba24074bc75c09400de319101d0201fdd5c3","chapter":{"id":"course","title":"3 · 评价先降序，再限制同一 GT 只用一次"},"unit":{"id":"notebook-blocks/8eced6ce67e84d02929cf23760a5eb09","title":"3 · 评价先降序，再限制同一 GT 只用一次"},"page":{"id":"reading-opening","title":"3 · 评价先降序，再限制同一 GT 只用一次","number":1},"sectionTitle":"3 · 评价先降序，再限制同一 GT 只用一次","currentQuestion":"3 · 评价先降序，再限制同一 GT 只用一次","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"table":{"headers":["匹配规则","P1","P2","AP50","最终 recall"],"rows":[["匹配规则","P1","P2","AP50","最终 recall"],["本册：先选最大 IoU GT，再检查是否已用","TP→GT1","重复 FP，仍以 GT1 为最佳","0.5","0.5"],["对照：先排除已用 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