class_docstr: echo transformer
class_docstr_tok: ["echo","transformer"]
code: def post_processing(self, input_df, y_pred, is_train):
      if is_train:
          return input_df[[self.target_col]], y_pred
      else:
          return y_pred
  
file_path: analytics-zoo/pyzoo/zoo/chronos/autots/deprecated/feature/identity_transformer.py
imports: from zoo.chronos.autots.deprecated.feature.utils import save_config
  from zoo.chronos.autots.deprecated.feature.abstract import BaseFeatureTransformer
label_desc: Use image node_id 8 for calling the IdentityTransformer obj's underlying member method code with example usage: obj.post_processing(input_df, y_pred, is_train) and returns: input_df,  y_pred, y_pred