code: def test_Init(self) -> None:
      shared_init_args = {
          "search_space": None,
          "observations": self.observations,
      }
      # test error for not specifying a config
      with self.assertRaises(ValueError):
          LogY(**shared_init_args)
      # test error for not specifying at least one metric
      with self.assertRaises(ValueError):
          LogY(**shared_init_args, config={})
      # test default init
      tf = LogY(**shared_init_args, config={"metrics": ["m1"]})
      self.assertEqual(tf._transform, lognorm_to_norm)
      self.assertEqual(tf._untransform, norm_to_lognorm)
      # test match_ci_width init
      tf = LogY(
          **shared_init_args,
          config={"metrics": ["m1"], "match_ci_width": True},
      )
      self.assertTrue("<lambda>" in tf._transform.__name__)
      self.assertTrue("<lambda>" in tf._untransform.__name__)
      # pyre-fixme[6]: For 1st param expected `ndarray` but got `float`.
      # pyre-fixme[6]: For 2nd param expected `ndarray` but got `float`.
      self.assertEqual(
          tf._transform(1.0, 0.1), match_ci_width(1.0, 0.1, np.log)
      )
      # pyre-fixme[6]: For 1st param expected `ndarray` but got `float`.
      # pyre-fixme[6]: For 2nd param expected `ndarray` but got `float`.
      self.assertEqual(
          tf._untransform(0.0, 0.1), match_ci_width(0.0, 0.1, np.exp)
      )
  
imports: import math
  from copy import deepcopy
  import numpy
  from ax.core.metric import Metric
  from ax.core.objective import MultiObjective, Objective
  from ax.core.observation import Observation, ObservationData, ObservationFeatures
  from ax.core.optimization_config import MultiObjectiveOptimizationConfig, OptimizationConfig
  from ax.core.outcome_constraint import ObjectiveThreshold, OutcomeConstraint
  from ax.core.types import ComparisonOp
  from ax.modelbridge.transforms.log_y import lognorm_to_norm, LogY, match_ci_width, norm_to_lognorm
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 3 for calling the LogYTransformTest obj's underlying member method code with example usage: obj.test_Init() without return types