class_docstr: Generator operator.
code: def __call__(self, num: List[int]):
      for i in num:
          yield i, i + self._factor
  
imports: from typing import List
  from towhee.operator import Operator, SharedType
label_desc: Use image node_id 2 for calling the FlatGen obj's underlying member method code with example usage: obj.__call__(num) without return types