code: def transform_dataframe(
      self, dataframe: pd.DataFrame
  ) -> pd.DataFrame:
      processed_df = super().transform_dataframe(dataframe)
      processed_df["income"] = processed_df["income"].str.rstrip(".")
      processed_df["income"] = processed_df["income"].str.strip()
      return processed_df
  
imports: import pandas
  from ludwig.datasets.loaders.dataset_loader import DatasetLoader
label_desc: Use image node_id 2 for calling the AdultCensusIncomeLoader obj's underlying member method code with example usage: obj.transform_dataframe(dataframe) and returns: processed_df