code: def __len__(self):
      return len(self.images_label)
  
imports: import os
  import json
  import random
  from PIL import Image
  import numpy
  from compression.api import DataLoader, Metric
  from torchvision.transforms import transforms
label_desc: Use image node_id 2 for calling the MyDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: len