https://blog.csdn.net/ztf312/article/details/50708302
报错原因：
Numpy对逻辑表达式判别不清楚，它可以返回False如果等号两边两个式子是数值相等，也可以返回True因为等号两边两个式子是逻辑相等。它觉得这是模棱两可的，因此放弃做判断，统一用a.any()进行或比较，或a.all()进行与比较。
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