The truth value of an array with more than one element is ambiguous.

这个错误是由于在Python中使用逻辑运算符（如and和or）时，对于包含多个元素的数组，无法确定其真值。为了解决这个问题，可以使用`a.any()`或`a.all()`方法来判断数组的真值。`a.any()`方法返回数组中是否存在任何一个非零元素，而`a.all()`方法返回数组中所有元素是否都为非零。通过使用这两个方法，可以明确地判断数组的真值。
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