docstr: Return the number of frames in the video, T
docstr_tok: ["Return","the","number","of","frames","in","the","video",",","T"]
code: def num_frames(self):
      """Return the number of frames in the video, T"""
      return self.video_tensor.shape[1]
  
imports: from typing import List, NamedTuple, Optional, Union
  import torch
  from torch import Tensor
label_desc: Use image node_id 3 for calling the VideoDataset obj's underlying member method code with example usage: obj.num_frames() and returns: self