code: def choose_user(self, users):
      return random.choice(users)
  
imports: import vowpalwabbit
  from distributionally_robust_data import OnlineCressieRead
  import collections
  import os
  import random
  import os
label_desc: Use image node_id 6 for calling the Simulator obj's underlying member method code with example usage: obj.choose_user(users) and returns: random