Salin sepanjang dimensi tambahan numpy
a = np.array([[1,2],[1,2]])
b = np.repeat(a[:, :, np.newaxis], 3, axis=2)
print(b[:, :, 0])
# [[1 2]
# [1 2]]
print(b[:, :, 1])
# [[1 2]
# [1 2]]
print(b[:, :, 2])
# [[1 2]
# [1 2]]
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