code: def config_parser(
      self,
      config_path: str,
      model_path: Optional[str],
      allow_empty_path=False,
  ) -> Tuple[str, str]:
      config_path = self._parse_config(config_path, "config")
  
      if isinstance(config_path, str) and model_path is None:
          if not allow_empty_path:
              raise ValueError(
                  f"Invalid config and model path pairs ({(config_path, model_path)}):"
                  f"When config_path is a regular URL, the model_path should not be empty"
              )
          else:
              return config_path, model_path
      elif (
          isinstance(config_path, LayoutModelConfig)
          and model_path is None
      ):
          model_path = config_path.dual()
      else:
          model_path = self._parse_config(model_path, "weight")
  
      config_path = (
          config_path
          if isinstance(config_path, str)
          else config_path.full
      )
      model_path = (
          model_path if isinstance(model_path, str) else model_path.full
      )
      return config_path, model_path
  
file_path: layout-parser/src/layoutparser/models/base_layoutmodel.py
imports: from typing import Optional, Tuple, Union, Dict
  from abc import ABC, abstractmethod
  from .model_config import LayoutModelConfig, add_identifier_for_config, layout_model_config_parser, is_lp_layout_model_config_any_format
  from ..file_utils import requires_backends
label_desc: Use image node_id 7 for calling the BaseLayoutModel obj's underlying member method code with example usage: obj.config_parser(config_path, model_path, allow_empty_path) and returns: config_path,  model_path, config_path,  model_path