code: def UCB(method: str, batch_size: int = 1):
      """The operator that implements UCB algorithms
  
      Args:
  
      """
      pass
  
file_path: ReAgent/serving/reagent/serving/config/operators.py
imports: from typing import Dict
  import reagent.serving.config.namespace
label_desc: Use image node_id 9 for calling a global function with example usage: UCB(method, batch_size) without return types