class_docstr: DenStream Micro-cluster class
code: def calc_weight(self, timestamp):
      return self._weight(
          self.fading_function(timestamp - self.last_edit_time)
      )
  
imports: from __future__ import annotations
  import copy
  import math
  from abc import ABCMeta
  from collections import defaultdict, deque
  from river import base, utils
label_desc: Use image node_id 3 for calling the DenStreamMicroCluster obj's underlying member method code with example usage: obj.calc_weight(timestamp) and returns: self