code: def __len__(self):
      return self.total_frames
  
file_path: DALI/docs/examples/use_cases/video_superres/dataloading/datasets.py
imports: import copy
  import sys, time, argparse, os, subprocess, shutil
  import math, numbers, random, bisect
  from random import Random
  from skimage import io, transform
  from os import listdir
  from os.path import join
  from glob import glob
  import numpy
  import torch
  import torch.utils.data
label_desc: Use image node_id 2 for calling the imageDataset obj's underlying member method code with example usage: obj.__len__() and returns: self