code: def batch_size(self) -> int:
      return self._batch_size
  
imports: import collections
  import collections.abc
  import copy
  import warnings
  from collections import OrderedDict
  from typing import Any, Callable, Dict, List, Optional, Union
  import torch
  from mmf.common.sample import detach_tensor, SampleList
label_desc: Use image node_id 3 for calling the Report obj's underlying member method code with example usage: obj.batch_size() and returns: self