code: def leaf_mutables(self, is_leaf):
      yield self.a
  
file_path: nni/test/ut/nas/test_engine.py
imports: import time
  import pytest
  import nni
  from nni.nas.experiment import NasExperiment
  from nni.nas.execution import ExecutionEngine, TrainingServiceExecutionEngine, SequentialExecutionEngine
  from nni.nas.execution.event import ModelEventType
  from nni.nas.evaluator import FunctionalEvaluator
  from nni.nas.space import BaseModelSpace, SimplifiedModelSpace, current_model, ModelStatus
label_desc: Use image node_id 3 for calling the MyModelSpace obj's underlying member method code with example usage: obj.leaf_mutables(is_leaf) without return types