Week 2, exercise 8: ValueError: cannot reshape array of size 2 into shape (4,1)

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
3

I already checked each step one by one even if test were passing. I spent around 4 hours but didn’t find :frowning:

My code for gradient descent is simple as it should be.

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for i in range(num_iterations):
# (≈ 1 lines of code)
# Cost and gradient calculation
# grads, cost = …
# YOUR CODE STARTS HERE
grads , cost = propagate(w, b, X, Y)

    # YOUR CODE ENDS HERE
    
    # Retrieve derivatives from grads
    dw = grads["dw"]
    db = grads["db"]
    
    # update rule (≈ 2 lines of code)
    # w = ...
    # b = ...
    # YOUR CODE STARTS HERE
    w = w - learning_rate * dw
    b = b - learning_rate * db
    # YOUR CODE ENDS HERE

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