code: def __len__(self):
      return len(self.files)
  
file_path: elegy/examples/need-fixing/WGAN-GP/main.py
imports: import glob
  import os
  import pickle
  import numpy
  import PIL.Image
  from absl import app, flags
  from model import WGAN_GP
  import elegy
label_desc: Use image node_id 2 for calling the Dataset obj's underlying member method code with example usage: obj.__len__() and returns: len