class_docstr: Class representing Treap (Cartesian Tree) used to calculate the Incremental KS statistics.
code: def get_size(node):
      return 0 if node is None else node.size
  
imports: from __future__ import annotations
  import math
  import random
  from river import base, stats
label_desc: Use image node_id 9 for calling the Treap obj's underlying member method code with example usage: obj.get_size(node) and returns: unknown