code: def __init__(self):
      self.mean = stats.Mean()
  
file_path: river/river/time_series/test_evaluate.py
imports: from __future__ import annotations
  from river import datasets, metrics, stats, time_series
label_desc: Use image node_id 1 to create a new MeanForecaster object from inherited base classes: time_series.base with example: obj = MeanForecaster()