https://blog.csdn.net/ztf312/article/details/50708302
報錯原因：
Numpy對邏輯表達式判別不清楚，它可以返回False如果等號兩邊兩個式子是數值相等，也可以返回True因為等號兩邊兩個式子是邏輯相等。它覺得這是模棱兩可的，因此放棄做判斷，統一用a.any()進行或比較，或a.all()進行與比較。
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