code: def echo_dataframe(self, df: pd.DataFrame) -> pd.DataFrame:
      return df
  
file_path: BentoML/tests/e2e/bento_server_grpc/python_model.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  from typing import Any
  import numpy
  import pandas
label_desc: Use image node_id 7 for calling the PythonFunction obj's underlying member method code with example usage: obj.echo_dataframe(df) and returns: df