code: def ext_to_camel(ext):
      if ext == "cpu":
          return ""
      return "".join([x.title() for x in ext.split(".")])
  
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 1 for calling a global function with example usage: ext_to_camel(ext) and returns: str, str