docs: def to_input_req(self):
          """Converts the ``self`` instance to the desired input request format.
  
          Returns:
              dict: Containing the "WarmStartType" and "ParentHyperParameterTuningJobs" as the first class fields.
  
          Examples:
              >>> warm_start_config = WarmStartConfig(warm_start_type=WarmStartTypes.TransferLearning,parents=["p1,p2"])
              >>> warm_start_config.to_input_req()
              {
                  "WarmStartType":"TransferLearning",
                  "ParentHyperParameterTuningJobs": [
                      {'HyperParameterTuningJobName': "p1"},
                      {'HyperParameterTuningJobName': "p2"},
                  ]
              }
          """
          return {
              WARM_START_TYPE: self.type.value,
              PARENT_HYPERPARAMETER_TUNING_JOBS: [{HYPERPARAMETER_TUNING_JOB_NAME: parent} for parent in self.parents]
          }