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实现代码","currentQuestion":"4. 对齐：把连续位置准确交给现有特征图 · 实现代码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-f3d337338a90cc91f468cac6","nextBlock":"b-534306b6479b00e5590738a5","prerequisites":[{"id":"b-a8c314fa969dbf57f3345c1b","url":"#b-a8c314fa969dbf57f3345c1b","role":"section-title"},{"id":"b-e80e841a5314dddea5428c63","url":"#b-e80e841a5314dddea5428c63","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-534306b6479b00e5590738a5","type":"pre","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/4296199189944332aa0e7d0ed0d6a2dc.html#b-534306b6479b00e5590738a5","content":"```\n# 独立一维采样练习；不等同于完整二维 RoIAlign。\nimport math\nfeature = [0.0,1.0,2.0,6.0,7.0]\nstride = 16.0\nfor x in [32.0,35.0,36.0,40.0,48.0]:\n    u = x/stride\n    lo = math.floor(u); hi = min(lo+1,len(feature)-1)\n    alpha = u-lo\n    v = (1-alpha)*feature[lo]+alpha*feature[hi]\n    print(f'原图x={x:g}, 特征u={u:g}, 左邻={lo}, 插值={v:g}')\nassert 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