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请教一下各位大佬,我将教程里的人脸识别代码直接粘贴到了IDE里没有做任何其他的事,却只有灰度图而没有框选出人脸,请问这是什么原因,是要在U盘里创建个文件夹插入人脸照片训练神经网络还是需要怎么做吗
https://singtown.com/learn/50013/
看一下视频