code: def first(self):
      if not isinstance(self.children[0], AdapterCompositionBlock):
          return self.children[0]
      else:
          return self.children[0].first()
  
imports: import itertools
  from collections.abc import Sequence
  from typing import List, Optional, Set, Tuple, Union
  import torch
label_desc: Use image node_id 6 for calling the AdapterCompositionBlock obj's underlying member method code with example usage: obj.first() and returns: self, self