code: def __call__(self, x):
      return self.factor + x
  
imports: import json
  import unittest
  from pathlib import Path
  from towhee import pipe
  from towhee import ops, register
  from towhee.runtime.time_profiler import TimeProfiler
  from towhee.tools.profilers import PerformanceProfiler
label_desc: Use image node_id 2 for calling the AddOperator obj's underlying member method code with example usage: obj.__call__(x) and returns: unknown