class_docstr: A test NNOperator with no functionality.
code: def framework(self, framework: str):
      self._framework = framework
  
imports: from towhee.operator import NNOperator
  from towhee.utils.log import engine_log
label_desc: Use image node_id 3 for calling the TestNNOperator obj's underlying member method code with example usage: obj.framework(framework) without return types