code: def get_special_metrics():
      # metrics that need special input format like PSI
      ensembles = MetricEnsemble()
      ensembles.add_metric(classi.PSI())
      return 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 7 for calling a global function with example usage: get_special_metrics() and returns: ensembles