class_docstr: LabeledVideoPaths contains pairs of video path and integer index label.
class_docstr_tok: ["LabeledVideoPaths","contains","pairs","of","video","path","and","integer","index","label","."]
docstr: Returns:
      The number of video paths and label pairs.
docstr_tok: ["Returns",":","The","number","of","video","paths","and","label","pairs","."]
code: def __len__(self) -> int:
      """
      Returns:
          The number of video paths and label pairs.
      """
      return len(self._paths_and_labels)
  
file_path: pytorchvideo/pytorchvideo/data/labeled_video_paths.py
imports: from __future__ import annotations
  import os
  import pathlib
  from typing import List, Optional, Tuple
  from iopath.common.file_io import g_pathmgr
  from torchvision.datasets.folder import make_dataset
label_desc: Use image node_id 7 for calling the LabeledVideoPaths obj's underlying member method code with example usage: obj.__len__() and returns: len