class_docstr: Flat input list.
code: def __call__(self, num1: List[int], num2: List[int]):
      return sum(num1), sum(num2)
  
imports: from typing import List
  from towhee.operator import Operator, SharedType
label_desc: Use image node_id 2 for calling the SumOperator obj's underlying member method code with example usage: obj.__call__(num1, num2) and returns: sum,  sum