code: def _frozen_context_middle():
      assert frozen_context.current() == {"a": 1, "b": 2}
  
      with frozen_context.bypass():
          assert frozen_context.current() is None
  
file_path: nni/test/ut/sdk/mutable/test_frozen.py
imports: import pytest
  from nni.mutable import *
label_desc: Use image node_id 1 for calling a global function with example usage: _frozen_context_middle() without return types