In Ex3 I’m getting this error, I’m kinda stuck , any tips?
At this point you can just sum up the weights and add the biases to the Z (instead of calling the function conv_sigle_step())
This exercise took me a long time too 
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Can you check your initialisation of Z? Seems to me that it might not have been initialised with the correct shape.
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Oh you’re right. Instead of initialize it with current n_H and n_W, I initialized it with n_H_prev and n_W_prev.
Thanks man
No problem, do delete the screenshot though since it does contain part of your solution. Good luck for the rest of the course!
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This was so helpful, even without seeing any code, I realized that by using the function we’d written previously, I was duplicating a step!