code: def __next__(self):
      try:
          batch = []
          for i in range(self.batch_size):
              batch.append(next(self.loader))
          batch = default_collate_fn(batch)
          return self.to_tensor(batch)
  
      except StopIteration as e:
          raise e
  
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 6 for calling the MOTVideoStreamReader obj's underlying member method code with example usage: obj.__next__() and returns: self