code: def setUp(self) -> None:
      self.df_hash = "3dd7ab8c67942d43c78ea4af05bbb1c4"
      self.df = pd.DataFrame(
          [
              {
                  "arm_name": "0_0",
                  "mean": 2.0,
                  "sem": 0.2,
                  "trial_index": 1,
                  "metric_name": "a",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
              {
                  "arm_name": "0_0",
                  "mean": 1.8,
                  "sem": 0.3,
                  "trial_index": 1,
                  "metric_name": "b",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
              {
                  "arm_name": "0_1",
                  "mean": 4.0,
                  "sem": 0.6,
                  "trial_index": 1,
                  "metric_name": "a",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
              {
                  "arm_name": "0_1",
                  "mean": 3.7,
                  "sem": 0.5,
                  "trial_index": 1,
                  "metric_name": "b",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
              {
                  "arm_name": "0_2",
                  "mean": 0.5,
                  "sem": None,
                  "trial_index": 1,
                  "metric_name": "a",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
              {
                  "arm_name": "0_2",
                  "mean": 3.0,
                  "sem": None,
                  "trial_index": 1,
                  "metric_name": "b",
                  "start_time": "2018-01-01",
                  "end_time": "2018-01-02",
              },
          ]
      )
  
imports: import random
  import pandas
  from ax.core.data import clone_without_metrics, custom_data_class, Data, set_single_trial
  from ax.utils.common.testutils import TestCase
  from ax.utils.common.timeutils import current_timestamp_in_millis
label_desc: Use image node_id 1 for calling the DataTest obj's underlying member method code with example usage: obj.setUp() without return types