docstr: Loads a file into a dataframe.
docstr_tok: ["Loads","a","file","into","a","dataframe","."]
code: def load_file_to_dataframe(self, file_path: str) -> pd.DataFrame:
      """Loads a file into a dataframe."""
      return pd.read_csv(file_path, sep="\t")
  
imports: import os
  from typing import Optional
  import pandas
  from ludwig.datasets.dataset_config import DatasetConfig
  from ludwig.datasets.loaders.dataset_loader import DatasetLoader
label_desc: Use image node_id 2 for calling the KDDCup2009Loader obj's underlying member method code with example usage: obj.load_file_to_dataframe(file_path) and returns: pd