initial_array = np.array([[[1, 1, 1, 2], [2, 2, 2, 3], [3, 3, 3, 4]], [[1, 
    1, 1, 2], [2, 2, 2, 3], [3, 3, 3, 4]]])
index = 0
initial_shape = initial_array.shape
reversed = np.empty(shape=initial_shape)
for inner_array in initial_array:
    reversed[index] = np.fliplr(inner_array)
index += 1
numpy reverse multidimensional array