class_docstr: LabeledVideoTensorDataset handles a direct tensor input data.
code: def size(self):
      return len(self._labeled_videos)
  
file_path: lightning-flash/src/flash/video/classification/utils.py
imports: from typing import List, Optional, Tuple, Type
  import torch
  from flash.core.utilities.imports import _TOPIC_VIDEO_AVAILABLE
label_desc: Use image node_id 4 for calling the LabeledVideoTensorDataset obj's underlying member method code with example usage: obj.size() and returns: len