code: def teardown_method(self):
      nn.set_default_context(self._ctx)
  
imports: import numpy
  import nnabla
  import pytest
  from nnabla.ext_utils import get_extension_context
  import nnabla.functions
label_desc: Use image node_id 2 for calling the TestNdArrayNarrow obj's underlying member method code with example usage: obj.teardown_method() without return types