code: public void setParentHyperParameterTuningJobs(java.util.Collection<ParentHyperParameterTuningJob> parentHyperParameterTuningJobs) {
          if (parentHyperParameterTuningJobs == null) {
              this.parentHyperParameterTuningJobs = null;
              return;
          }
  
          this.parentHyperParameterTuningJobs = new java.util.ArrayList<ParentHyperParameterTuningJob>(parentHyperParameterTuningJobs);
      }
docs: <p>
  An array of hyperparameter tuning jobs that are used as the starting point for the new hyperparameter tuning job.
  For more information about warm starting a hyperparameter tuning job, see <a
  href="http://docs.aws.amazon.com/sagemaker/latest/dg/automatic-model-tuning-warm-start.html">Using a Previous
  Hyperparameter Tuning Job as a Starting Point</a>.
  </p>
  <p>
  Hyperparameter tuning jobs created before October 1, 2018 cannot be used as parent jobs for warm start tuning
  jobs.
  </p>
  
  @param parentHyperParameterTuningJobs
  An array of hyperparameter tuning jobs that are used as the starting point for the new hyperparameter
  tuning job. For more information about warm starting a hyperparameter tuning job, see <a
  href="http://docs.aws.amazon.com/sagemaker/latest/dg/automatic-model-tuning-warm-start.html">Using a
  Previous Hyperparameter Tuning Job as a Starting Point</a>.</p>
  <p>
  Hyperparameter tuning jobs created before October 1, 2018 cannot be used as parent jobs for warm start
  tuning jobs.