code: def num_features(self) -> int:
      return len(self.categorical_fields) + len(self.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 5 for calling the TabularData obj's underlying member method code with example usage: obj.num_features() and returns: unknown