class_docstr: Micro-cluster class.
code: def insert(self, x, w, timestamp):
      self.var_time.update(timestamp, w)
      for x_idx, x_val in x.items():
          self.var_x[x_idx].update(x_val, w)
  
imports: from __future__ import annotations
  import math
  from collections import defaultdict
  from river import base, cluster, stats, utils
label_desc: Use image node_id 6 for calling the CluStreamMicroCluster obj's underlying member method code with example usage: obj.insert(x, w, timestamp) without return types