>>> a = np.array([[1, 2, 3],
[4, 5, 6],
[7, 8, 9]])
>>> np.repeat(np.repeat(a, 2, 0), 2, 1)
array([[1, 1, 2, 2, 3, 3],
[1, 1, 2, 2, 3, 3],
[4, 4, 5, 5, 6, 6],
[4, 4, 5, 5, 6, 6],
[7, 7, 8, 8, 9, 9],
[7, 7, 8, 8, 9, 9]])
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