code: def Expression(equation: str):
      """The operator that can do calculation based on the given equation
  
      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 3 for calling a global function with example usage: Expression(equation) without return types