code: def __init__(self, video_instances: List[str], pts_unit: str):
      self.video_instances = video_instances
      self.pts_unit = pts_unit
  
imports: import os
  import threading
  import warnings
  import weakref
  from fractions import Fraction
  from typing import Any, Dict, List, Tuple
  import numpy
  import torch
  import torchvision
  from PIL import Image
  from torch.utils.data import DataLoader, Dataset
  from torchvision import datasets, io
  from tqdm import tqdm
label_desc: Use image node_id 1 to create a new _TimestampFpsFromVideosDataset object from inherited base classes: Dataset with example: obj = _TimestampFpsFromVideosDataset(video_instances, pts_unit)