code: def __init__(self, lambd: float):
      self._ewma = stats.EWMean(lambd)
      self._is_init = False
      # Independent bound condition
      self._ibc = 1.0
      self._lambd_sq = lambd * lambd
      self._c_lambd_sq = (1 - lambd) ** 2
  
imports: from __future__ import annotations
  import copy
  import math
  from river import base, stats
label_desc: Use image node_id 1 to create a new SampleInfo object  with example: obj = SampleInfo(lambd)