I got an error getting Z[i].
I tried to print the shapes of both a_slice_prev and W and I found that at a specific iteration I got a_slice_prev to be 4 * 3 * 4 although all dimensions seemed to be ok.
here is a screen shot of the error if anyone can suggest solutions
Problem Solved and Regards . 
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It’s great that you found the solution under your own power! Thanks for confirming.
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