code: def time_merge(self, n):
      dis = self.disjoint_set
      for a, b in self.edges:
          dis.merge(a, b)
  
file_path: scipy/benchmarks/benchmarks/cluster_hierarchy_disjoint_set.py
imports: import numpy
  from .common import Benchmark
label_desc: Use image node_id 2 for calling the Bench obj's underlying member method code with example usage: obj.time_merge(n) without return types