code: def __call__(
      self,
      dataset,
      worker_num,
  ):
      self.dataset = dataset
      # get data
      self.dataset.set_transform(self._sample_transforms)
      # set kwargs
      self.dataset.set_kwargs(**self.kwargs)
  
      self.loader = iter(self.dataset)
      return self
  
imports: import numbers
  import os
  import sys
  from collections import deque
  from collections.abc import Mapping
  import six
  from ppdet.core.workspace import register, serializable
  from ppdet.utils.logger import setup_logger
  from ppdet.data.reader import BaseDataLoader, Compose
  import cv2
  from imageio import imread, imwrite
  import numpy
  import paddle
  from paddle.framework import core
label_desc: Use image node_id 2 for calling the MOTVideoStreamReader obj's underlying member method code with example usage: obj.__call__(dataset, worker_num) and returns: self