code: def numerical_fields(self) -> Optional[List[str]]:
      return self.parameters["numerical_fields"]
  
file_path: lightning-flash/src/flash/tabular/data.py
imports: from typing import Any, Dict, List, Optional
  from flash.core.data.data_module import DataModule
  from flash.core.data.io.input_transform import InputTransform
  from flash.core.data.io.output_transform import OutputTransform
label_desc: Use image node_id 4 for calling the TabularData obj's underlying member method code with example usage: obj.numerical_fields() and returns: self