class_docstr: Implementation of HpoExecutor Interface, where our custom logic is used as the backend
code: def validate_search_space(self, search_space, model_name):
      if not any(
          isinstance(search_space[hyperparam], space.Space)
          for hyperparam in search_space
      ):
          logger.warning(
              f"\tNo hyperparameter search space specified for {model_name}. Skipping HPO. "
              f"Will train one model based on the provided hyperparameters."
          )
          raise EmptySearchSpace
      self.search_space = search_space
      logger.log(
          15, f"\tHyperparameter search space for {model_name}: "
      )
      for hyperparam in search_space:
          if isinstance(search_space[hyperparam], space.Space):
              logger.log(
                  15, f"{hyperparam}:   {search_space[hyperparam]}"
              )
  
imports: from __future__ import annotations
  import copy
  import logging
  import math
  import os
  import time
  from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Tuple, Union
  import pandas
  from autogluon.common import space
  from autogluon.common.utils.resource_utils import ResourceManager
  from autogluon.common.utils.s3_utils import is_s3_url
  from ..ray.resources_calculator import ResourceCalculator
  from ..scheduler.scheduler_factory import scheduler_factory
  from ..utils.savers import save_pkl
  from .constants import CUSTOM_BACKEND, RAY_BACKEND
  from .exceptions import EmptySearchSpace
label_desc: Use image node_id 7 for calling the CustomHpoExecutor obj's underlying member method code with example usage: obj.validate_search_space(search_space, model_name) without return types