code: def __del__(self) -> None:
      self.src_data.close()
  
imports: import os.path
  import numpy
  import cv2
  import math
  from typing import List, Dict, Tuple, Union
  from collections import defaultdict
  from easydict import EasyDict
  from .imgtools import sample_norm, two_percentLinear, get_thumbnail
label_desc: Use image node_id 2 for calling the Raster obj's underlying member method code with example usage: obj.__del__() without return types