code: def testLogUniform(self):
      sampler = tune.loguniform(1e-10, 1e-1)
      results = sampler.sample(None, 1000)
      assert abs(np.log(min(results)) / np.log(10) - -10) < 0.1
      assert abs(np.log(max(results)) / np.log(10) - -1) < 0.1
  
      sampler_e = tune.loguniform(np.e**-4, np.e, base=np.e)
      results_e = sampler_e.sample(None, 1000)
      assert abs(np.log(min(results_e)) - -4) < 0.1
      assert abs(np.log(max(results_e)) - 1) < 0.1
  
imports: import os
  import numpy
  import random
  import unittest
  import ray
  from ray.rllib import _register_all
  from ray import tune
  from ray.tune.result import DEFAULT_RESULTS_DIR
  from ray.tune.search import grid_search, BasicVariantGenerator
  from ray.tune.search.variant_generator import RecursiveDependencyError, _resolve_nested_dict
label_desc: Use image node_id 13 for calling the VariantGeneratorTest obj's underlying member method code with example usage: obj.testLogUniform() without return types