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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