numpy.argmax()的理论平均用例运行时复杂度

问题描述

我正在查看 numpy.argmax 函数的代码.我对 argmax 函数维护的 numpy 数据结构感到困惑.

I was looking at the code of numpy.argmax function. I am confused which data structure numpy maintains for the argmax function.

https://numpy.org/doc/stable/reference/generated/numpy.argmax.html

Eventually, I want to know what is the theoretical average case running time complexity of numpy argmax function for primitive data types. Is it O(logN) or O(N) in the average case?

This may be a relevant question as well: Faster alternatives to numpy.argmax/argmin which is slow

Thanks in advance.

解决方案

Here is a performance analysis using benchit:

def m(x):
  return np.argmax(x)

in_ = [np.random.rand(n) for n in [10,100,1000,10000]]

As you can see it is O(N) as it should be. You iterate over array once to find the maximum.

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