code: def testConvertBOHB(self):
      from ray.tune.search.bohb import TuneBOHB
      import ConfigSpace
  
      # Grid search not supported, should raise ValueError
      with self.assertRaises(ValueError):
          TuneBOHB.convert_search_space(
              {"grid": tune.grid_search([0, 1])}
          )
  
      config = {
          "a": ray.tune.search.sample.Categorical([2, 3, 4]).uniform(),
          "b": {
              "x": ray.tune.search.sample.Integer(0, 5).quantized(2),
              "y": 4,
              "z": ray.tune.search.sample.Float(
                  1e-4, 1e-2
              ).loguniform(),
          },
      }
      converted_config = TuneBOHB.convert_search_space(config)
      bohb_config = ConfigSpace.ConfigurationSpace()
      bohb_config.add_hyperparameters(
          [
              ConfigSpace.CategoricalHyperparameter("a", [2, 3, 4]),
              ConfigSpace.UniformIntegerHyperparameter(
                  "b/x", lower=0, upper=4, q=2
              ),
              ConfigSpace.UniformFloatHyperparameter(
                  "b/z", lower=1e-4, upper=1e-2, log=True
              ),
          ]
      )
  
      converted_config.seed(1234)
      bohb_config.seed(1234)
  
      searcher1 = TuneBOHB(
          space=converted_config, metric="a", mode="max"
      )
      searcher2 = TuneBOHB(space=bohb_config, metric="a", mode="max")
  
      config1 = searcher1.suggest("0")
      config2 = searcher2.suggest("0")
  
      self.assertEqual(config1, config2)
      self.assertIn(config1["a"], [2, 3, 4])
      self.assertIn(config1["b"]["x"], list(range(5)))
      self.assertLess(1e-4, config1["b"]["z"])
      self.assertLess(config1["b"]["z"], 1e-2)
  
      searcher = TuneBOHB(metric="a", mode="max")
      analysis = tune.run(
          _mock_objective,
          config=config,
          search_alg=searcher,
          num_samples=1,
      )
      trial = analysis.trials[0]
      self.assertIn(trial.config["a"], [2, 3, 4])
      self.assertEqual(trial.config["b"]["y"], 4)
  
      mixed_config = {
          "a": tune.uniform(5, 6),
          "b": tune.uniform(8, 9),  # Cannot mix ConfigSpace and Dict
      }
      searcher = TuneBOHB(space=mixed_config, metric="a", mode="max")
      config = searcher.suggest("0")
      self.assertTrue(5 <= config["a"] <= 6)
      self.assertTrue(8 <= config["b"] <= 9)
  
imports: from collections import defaultdict
  from unittest.mock import patch
  import numpy
  import unittest
  import ray
  import ray.tune.search.sample
  from ray import train, tune
  from ray.tune import Experiment
  from ray.tune.search.util import logger
  from ray.tune.search.variant_generator import generate_variants
label_desc: Use image node_id 20 for calling the SearchSpaceTest obj's underlying member method code with example usage: obj.testConvertBOHB() without return types