code: def __len__(self):
      return self.num_clips()
  
file_path: mmf/mmf/datasets/builders/charades/_utils.py
imports: import logging
  import tempfile
  from pathlib import Path
  import pandas
  import torch
  from torchvision.datasets.video_utils import VideoClips
  from torchvision.io import read_video
label_desc: Use image node_id 3 for calling the CharadesVideoClips obj's underlying member method code with example usage: obj.__len__() and returns: self