code: def base_cls(self):
      from skorch.callbacks import Callback
  
      return Callback
  
file_path: skorch/skorch/tests/callbacks/test_all.py
imports: import itertools
  import pytest
label_desc: Use image node_id 2 for calling the TestAllCallbacks obj's underlying member method code with example usage: obj.base_cls() and returns: Callback