class_docstr: Micro-cluster class.
code: def radius(self, r_factor):
      if self.weight == 1:
          return 0
      return self._deviation() * r_factor
  
imports: from __future__ import annotations
  import math
  from collections import defaultdict
  from river import base, cluster, stats, utils
label_desc: Use image node_id 3 for calling the CluStreamMicroCluster obj's underlying member method code with example usage: obj.radius(r_factor) and returns: unknown, int