code: def force_list(x):
      if isinstance(x, list):
          return x
      if isinstance(x, tuple):
          return list(x)
      return [x]
  
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 12 for calling a global function with example usage: force_list(x) and returns: list, x, list