code: def sample_flags(self, sampled):
      self.flags -= set(sampled)
  
imports: from __future__ import annotations
  import heapq
  import itertools
  import math
  import random
  from river import base
label_desc: Use image node_id 15 for calling the Vertex obj's underlying member method code with example usage: obj.sample_flags(sampled) without return types