Course 1 week 2 exercise 5: name 'np' is not defined

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

I don’t understand what the error means. np should be well defined at the first begining.
Please help

NameError Traceback (most recent call last)
in
----> 1 w = np.array([[1.], [2]])
2 b = 1.5
3 X = np.array([[1., -2., -1.], [3., 0.5, -3.2]])
4 Y = np.array([[1, 1, 0]])
5 grads, cost = propagate(w, b, X, Y)

NameError: name ‘np’ is not defined

2

Please run the cell containing import numpy as np before solving exercise 5.

3

issue solved. Thanks.

4

This is one of the things covered on the DLS FAQ Thread, which is worth a look on general principles even though you have the answer to this specific question from Balaji.