[Python] How to count num of elements vector with numpy python

For example if i have:

a=np.array([[1,1,4,1,4,3,1]])


We can see that we have the number 1 four times, the number 4 twice and 3 only ones.

I want to have the following result:

array(4,4,2,4,2,1,4)


As you can see: each cell is replaced by the count of it's element.

How can i do it in the best efficient way?

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