code: def list_context(func_name):
      try:
          import list_context_ext
  
          return list_context_ext.list(func_name)
      except Exception as e:
          print(e)
          return [(nn.Context(), func_name)]
  
imports: from nnabla.utils import nnabla_pb2
  from six.moves import filter
  import copy
  import nnabla
  import nnabla.ext_utils
  import nnabla.functions
  import nnabla.utils.converter
  import nnabla.dtypes
  from nnabla.testing import assert_allclose
  import numpy
  import numpy
  import platform
label_desc: Use image node_id 3 for calling a global function with example usage: list_context(func_name) and returns: list_context_ext, list