> import numpy as np
> a = np.array([[1, 2, 3], [3, 1, 2]])
> b = np.array([[5, 2, 6], [5, 1, 2]])
> a
array([[1, 2, 3],
    [3, 1, 2]])
> b
array([[5, 2, 6],
    [5, 1, 2]])
> c = a + b
> c
array([[6, 4, 9],
    [8, 2, 4]])
> c = (a+b)/2
> c
array([[ 3. , 2. , 4.5],
    [ 4. , 1. , 2. ]])
>