class_docstr: DBStream Micro-cluster class
class_docstr_tok: ["DBStream","Micro-cluster","class"]
code: def merge(self, cluster):
      # Using cluster.center.get allows updating clusters with different features
      self.center = {
          i: (
              self.center[i] * self.weight
              + cluster.center.get(i, 0.0) * cluster.weight
          )
          / (self.weight + cluster.weight)
          for i in self.center.keys()
      }
      self.weight += cluster.weight
  
imports: from __future__ import annotations
  import collections
  import copy
  import math
  from abc import ABCMeta
  from river import base, utils
label_desc: Use image node_id 2 for calling the DBSTREAMMicroCluster obj's underlying member method code with example usage: obj.merge(cluster) without return types