Fix lama_mpe infinity loop

        pos = np.zeros((h, w), dtype=np.int32)

        direct = np.zeros((h, w, 4), dtype=np.int32)

        i = 0

        if mask3.max() > 0:

            # otherwise it will cause infinity loop

            while np.sum(1 - mask3) > 0:

                i += 1

                mask3_ = cv2.filter2D(mask3, -1, ones_filter)