class_docstr: Micro-cluster class.
code: def weight(self):
      return self.var_time.n
  
imports: from __future__ import annotations
  import math
  from collections import defaultdict
  from river import base, cluster, stats, utils
label_desc: Use image node_id 5 for calling the CluStreamMicroCluster obj's underlying member method code with example usage: obj.weight() and returns: self