code: def reset(self) -> None:
      self.old_wt = np.ones(self.shape[self.axis - 1])
      self.last_ewm = None
  
file_path: catboost/contrib/python/pandas/py3/pandas/core/window/online.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  import numpy
  from pandas.compat._optional import import_optional_dependency
label_desc: Use image node_id 3 for calling the EWMMeanState obj's underlying member method code with example usage: obj.reset() without return types