code: def my_dataframe(my_series):
      return my_series.to_frame(name="target")
  
imports: import io
  from typing import Callable, List, Union
  import pandas
  import numpy
  import pytest
  from gluonts.dataset import pandas
  from gluonts.testutil.equality import assert_recursively_equal
label_desc: Use image node_id 2 for calling a global function with example usage: my_dataframe(my_series) and returns: my_series