[英]Why can't __array_function__ be called from an instance of an np.ndarray?
I am trying to write a custom array container following numpy's guide and I can't understand why the following code always returns NotImplemented
.我正在尝试按照numpy 的指南编写自定义数组容器,但我不明白为什么以下代码总是返回NotImplemented
。
import numpy as np
a = np.array([1])
shape = (2, 2)
a.__array_function__(func=np.broadcast_to, types=(np.ndarray, type(shape)), args=(a, shape), kwargs={})
Out[5]: NotImplemented
Even though the normal method obviously works即使正常方法显然有效
np.broadcast_to(a, shape)
Out[6]:
array([[1, 1],
[1, 1]])
The function np.broacast_to
is just an example, np.reshape
has the same issue. function np.broacast_to
只是一个例子, np.reshape
也有同样的问题。
Does anyone know what my mistake is?有谁知道我的错误是什么?
types
is only supposed to include types that actually implement __array_function__
. types
只应该包含实际实现__array_function__
的类型。 type(shape)
doesn't implement __array_function__
, so it shouldn't be in types
. type(shape)
没有实现__array_function__
,所以它不应该在types
中。
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