class_docstr: Micro-cluster class.
code: def relevance_stamp(self, max_mc):
      mu_time = self.var_time.mean.get()
      if self.weight < 2 * max_mc:
          return mu_time
  
      sigma_time = math.sqrt(self.var_time.get())
      return mu_time + sigma_time * self._quantile(
          max_mc / (2 * self.weight)
      )
  
imports: from __future__ import annotations
  import math
  from collections import defaultdict
  from river import base, cluster, stats, utils
label_desc: Use image node_id 7 for calling the CluStreamMicroCluster obj's underlying member method code with example usage: obj.relevance_stamp(max_mc) and returns: unknown, mu_time