code: def set_batch_first(self, is_batch_first=True):
      self.batch_first = is_batch_first
  
imports: from contextlib import contextmanager
  import torch
  import functools
  from torch._decomp import decomposition_table
  from typing import Callable, Dict
  from torch.utils._pytree import tree_map_only
label_desc: Use image node_id 12 for calling the ExpandedWeight obj's underlying member method code with example usage: obj.set_batch_first(is_batch_first) without return types