我国人脸识别技术处于世界领先地位.所谓人脸识别,就是利用计算机检测样本之间的相似度,余弦距离是检测相似度的常用方法.假设二维空间中有两个点
为坐标原点,余弦相似度Similarity为向量
夹角的余弦值,记作
,余弦距离为
.已知
,若
的余弦距离为
的余弦距离为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0986a40630af896b7c8c666f323e6436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc2294ee512fa1ee5f14ad65a24a499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df320d266e857a428ff0bac1eb680bf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f328d6d218252d0bbb1c92150de8666d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffedaba65fc3c67d2cac60c77ab29377.png)
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更新时间:2023-07-13 22:08:31
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【推荐1】若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58329bf8b7d72351f20af569704ce0e.png)
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【推荐1】我国人脸识别技术处于世界领先地位.所谓人脸识别,就是利用计算机检测样本之间的相似度,余弦距离是检测相似度的常用方法.假设二维空间中有两个点
,
,O为坐标原点,余弦相似度为向量
,
夹角的余弦值,记作
,余弦距离为
.已知
,
,
,若P,Q的余弦距离为
,
,则Q,R的余弦距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
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【推荐1】已知向量
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【推荐2】已知平面向量
,
,
满足
,
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的最大值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
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