Add padding to 2d matrix \np

import numpy as np
# https://numpy.org/doc/stable/reference/generated/numpy.pad.html
image = np.ones((2,2), dtype=int)

padded_image = np.pad(image, 1, dtype=int, mode='constant')

print(padded_image)
# [[0 0 0 0]
#  [0 1 1 0]
#  [0 1 1 0]
#  [0 0 0 0]]

Source: numpy.org

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