import numpy as np
    print(np.__version__)
    a = np.array([1,2,3])
    b = np.array([1])

    print(a in b)
    print(b in a)
    print(np.isin(a, b))
    print(np.isin(b, a))
    print(np.isin(a.astype(float), b))
    print(np.isin(a, b.astype(float))))

    1.21.6
    True
    True
    [ True False False]
    [ True]
    [ True False False]
    [ True False False]