Python：4**-0.5 ---> - 在 ** 之前签名是什么意思？

Question

求平方根时，我们执行number**0.5，但是0.5之前的-号是什么意思

我在看一段代码（我是专门看ViT代码的（https://github.com/huggingface/pytorch-image-models/blob/main/timm/models/vision_transformer.py），这里是为了缩放，他们补充说：

self.scale = self.head_dim ** -0.5

请帮我理解它的意思。我在我的终端上做了一些实验，但不明白发生了什么：

>>> a = 4
>>> a**0.5
2.0
>>>
>>> a**-0.5
0.5

Answer 1

互惠。

x**-n == 1/(x**n)

......

https://stackoverflow.com/users/707111/ry

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