code: def setUp(self) -> None:
      self.search_space = SearchSpace(
          parameters=[
              RangeParameter(
                  "x",
                  lower=1,
                  upper=4,
                  parameter_type=ParameterType.FLOAT,
              )
          ]
      )
      self.training_feats = [
          ObservationFeatures({"x": 1}, trial_index=0),
          ObservationFeatures({"x": 2}, trial_index=0),
          ObservationFeatures({"x": 3}, trial_index=1),
          ObservationFeatures({"x": 4}, trial_index=2),
      ]
      self.training_obs = [
          Observation(
              data=ObservationData(
                  metric_names=[],
                  means=np.array([]),
                  covariance=np.empty((0, 0)),
              ),
              features=obsf,
          )
          for obsf in self.training_feats
      ]
  
      self.t = TrialAsTask(
          search_space=self.search_space,
          observations=self.training_obs,
      )
      self.bm = {
          "bp1": {0: "v1", 1: "v2", 2: "v3"},
          "bp2": {0: "u1", 1: "u1", 2: "u2"},
      }
  
      self.t2 = TrialAsTask(
          search_space=self.search_space,
          observations=self.training_obs,
          config={"trial_level_map": self.bm},
      )
      self.t3 = TrialAsTask(
          search_space=self.search_space,
          observations=self.training_obs,
          config={"trial_level_map": {}},
      )
      # test string trial indices
      self.bm2 = {
          p_name: {str(k): v for k, v in value_dict.items()}
          for p_name, value_dict in self.bm.items()
      }
      self.t4 = TrialAsTask(
          search_space=self.search_space,
          observations=self.training_obs,
          config={"trial_level_map": self.bm2, "target_trial": 2},
      )
  
file_path: Ax/ax/modelbridge/transforms/tests/test_trial_as_task_transform.py
imports: from copy import deepcopy
  import numpy
  from ax.core.observation import Observation, ObservationData, ObservationFeatures
  from ax.core.parameter import ChoiceParameter, ParameterType, RangeParameter
  from ax.core.search_space import SearchSpace
  from ax.exceptions.core import UnsupportedError
  from ax.modelbridge.transforms.trial_as_task import TrialAsTask
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import get_robust_search_space
label_desc: Use image node_id 1 for calling the TrialAsTaskTransformTest obj's underlying member method code with example usage: obj.setUp() without return types