code: def get_pandas_df() -> pd.DataFrame:
      return pd.DataFrame(
          {
              "privacy_key": [0, 1, 1],
              "group_key": ["key1", "key2", "key1"],
              "value": [5.0, 2.5, -2],
              "value2": [1.0, -2.0, 4],
          }
      )
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from collections import namedtuple
  import pandas
  from pyspark import sql
  from unittest import mock
  from unittest.mock import patch
  from pipeline_dp import dataframes
  import pipeline_dp
label_desc: Use image node_id 1 for calling a global function with example usage: get_pandas_df() and returns: pd