code: def _fn_noimpl(*args, **kwargs):
      raise NotImplementedError()
  
file_path: mxnet/tests/python/unittest/test_contrib_optimizer.py
imports: import itertools
  import numpy
  import mxnet
  from mxnet.test_utils import *
  import pytest
  from common import xfail_when_nonstandard_decimal_separator
label_desc: Use image node_id 2 for calling a global function with example usage: _fn_noimpl() without return types