code: def repr_split(self):
      return f"{self.feature} ≤ {self.threshold}"
  
imports: from __future__ import annotations
  import collections
  import math
  from river import base, stats
  from river.tree.base import Branch, Leaf
  from river.utils.math import log_sum_2_exp
label_desc: Use image node_id 5 for calling the MondrianBranch obj's underlying member method code with example usage: obj.repr_split() and returns: self, str, self