NameError: name 'np' is not defined in the assignement

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

NameError Traceback (most recent call last)
in
----> 1 t_x = np.array([1, 2, 3])
2 print ("sigmoid_derivative(t_x) = " + str(sigmoid_derivative(t_x)))
3
4 sigmoid_derivative_test(sigmoid_derivative)

NameError: name ‘np’ is not defined

1 Like
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There is a topic about that on the FAQ Thread. The short answer is that the problem is just that you have not executed the previous cells in the notebook. Try “Cell → Run All Above” and that should fix this issue.

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BTW You filed this under DLS Course 2, but I think you are referring to the first Numpy Tutorial assignment in DLS Course 1. I will move it for you.