code: def _mean(self, tile_size):
      return np.ones((tile_size[0], tile_size[1]), dtype=np.float32)
  
imports: import dataclasses
  import math
  from typing import List, Iterable, Tuple, Union, Sequence
  import cv2
  import numpy
  import torch
label_desc: Use image node_id 8 for calling the ImageSlicer obj's underlying member method code with example usage: obj._mean(tile_size) and returns: np