The error seems to be at the multiplication of matrices W and a_in. In order to acomplish that you need sizes of this nature: If w of m×n size then a_in shoulb be of nxy where y is any number >=1.

Looks to me like your code creates a variable ‘w’ and then uses ‘W’ in the next line. Is that what you intended?

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*W* and *a_in* have different dimensions and do not match. One is (2,3) and the other is (2,0)