code: def predict_dataframe(self, df: pd.DataFrame) -> pd.DataFrame:
      assert isinstance(df, pd.DataFrame)
      output = df[["col1"]] * 2  # type: ignore
      assert isinstance(output, pd.DataFrame)
      return output
  
file_path: BentoML/tests/e2e/bento_server_http/pickle_model.py
imports: from __future__ import annotations
  import time
  import typing
  from typing import TYPE_CHECKING
  import numpy
  import pandas
label_desc: Use image node_id 8 for calling the PickleModel obj's underlying member method code with example usage: obj.predict_dataframe(df) and returns: output