解决Numpy 报错 ValueError: zero-size array to reduction operation maximum which has no identity

这是因为numpy对一个空的array做运算操作造成的，如：

x = np.array([])
# x + 1 # 会报错

建议在代码中可以改为：

if x.size == 0:print('x.size is 0')
else:print('x.size > 0')

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解决Numpy 报错 ValueError: zero-size array to reduction operation maximum which has no identity

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