code: def transform(
      self,
      X: pd.DataFrame,
      y_hat: pd.Series,
      s: Optional[pd.Series] = None,
  ) -> pd.Series:
      return y_hat
  
file_path: aequitas/src/aequitas/fairflow/methods/postprocessing/identity.py
imports: from typing import Optional
  import pandas
  from .postprocessing import PostProcessing
label_desc: Use image node_id 3 for calling the Identity obj's underlying member method code with example usage: obj.transform(X, y_hat, s) and returns: y_hat