code: def __repr__(self):
      return "(n={}, mean={})".format(self.n, self.mean)
  
file_path: ray/python/ray/data/_internal/size_estimator.py
imports: from typing import Any, List
  import ray
  from ray import cloudpickle
label_desc: Use image node_id 5 for calling the RunningMean obj's underlying member method code with example usage: obj.__repr__() and returns: str