Hello,
I am stuck in exercise 4 of the week 3 assignment . The part where you compute forward propagation. I computed the values using the formula given, using np.dot for Z1 and Z2 without transposing the W1 or W2. A1 and A2 were calculated using the tanh and sigmoid functions repeatedly. I get assertion error , but it says that all tests were passed. Heres the traceback.

Dot product for Z1 and Z2 seem to be OK.
Tracking the dimension of variables is the common way of debugging that you will use multiple times through this course. You can check the shape of each variable with print() command.
Here is the list of dimensions for key variables for the first test.