code: def default_framework():
      original_framework = get_default_framework()
      set_default_framework("tensorflow")
      yield
      set_default_framework(original_framework)
  
imports: import json
  from pathlib import Path
  import pytest
  from nni.common.framework import get_default_framework, set_default_framework
  from nni.nas.space import StationaryMutator, Mutator, MutationSampler, GraphModelSpace, ModelStatus, MutatorSequence
  from nni.nas.space.mutator import _RandomSampler
  from nni.nas.space.graph_op import Operation
label_desc: Use image node_id 1 for calling a global function with example usage: default_framework() without return types