code: def _empty_backprop(dX):
      return []
  
file_path: spacy-transformers/spacy_transformers/layers/listener.py
imports: from typing import Optional, Callable, List
  from thinc.api import Model
  from spacy.errors import Errors
  from spacy.tokens import Doc
  from ..data_classes import TransformerData
label_desc: Use image node_id 2 for calling a global function with example usage: _empty_backprop(dX) and returns: list