code: def get_regression_metrics():
      regression_ensembles = MetricEnsemble()
      regression_ensembles.add_metric(reg.RMSE()).add_metric(
          reg.MAE()
      ).add_metric(reg.MSE()).add_metric(reg.R2Score())
      return regression_ensembles
  
file_path: FATE/python/fate/ml/evaluation/tool.py
imports: import inspect
  from fate.ml.evaluation import classification
  from fate.ml.evaluation import regression
  from fate.ml.evaluation.metric_base import Metric, MetricEnsemble
label_desc: Use image node_id 6 for calling a global function with example usage: get_regression_metrics() and returns: regression_ensembles