Some notes on week 4, programming assignment 2

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

That function was given to you in the template code. It is at the end of the two_layer_model cell:

        # Print the cost every 100 iterations and for the last iteration
        if print_cost and (i % 100 == 0 or i == num_iterations - 1):
            print("Cost after iteration {}: {}".format(i, np.squeeze(cost)))
        if i % 100 == 0:
            costs.append(cost)
            
    return parameters, costs

def plot_costs(costs, learning_rate=0.0075):
    plt.plot(np.squeeze(costs))
    plt.ylabel('cost')
    plt.xlabel('iterations (per hundreds)')
    plt.title("Learning rate =" + str(learning_rate))
    plt.show()

You must have accidentally deleted it. If you don’t believe me, get a clean copy and compare for yourself.