code: def __init__(self):
      self.mean = stats.Mean()
  
imports: from __future__ import annotations
  import collections
  import functools
  import io
  import math
  import typing
  from river import anomaly, base, drift, linear_model, stats
  from river.tree import split_criterion
  from river.tree import splitter
  from .base import HoeffdingRule
label_desc: Use image node_id 1 to create a new MeanRegressor object from inherited base classes: base with example: obj = MeanRegressor()