import numpy as np
a, b = np.array([13.0, 14.0, 15.0, 32.0, 33.0]), np.array([15.0, 16.0, 17.0,
    33.0, 34.0, 47.0])
np.argwhere(np.in1d(a, np.intersect1d(a, b)) == False)
Determine arguments where two numpy arrays intersect in Python