code: def updater(key, recv, local):
      """use updater: += with int keys"""
      assert isinstance(key, int)
      local += recv
  
imports: import mxnet
  import numpy
  import unittest
  from mxnet.test_utils import rand_ndarray, assert_almost_equal
  from common import assertRaises
  from mxnet.base import py_str, MXNetError
  import pytest
label_desc: Use image node_id 11 for calling a global function with example usage: updater(key, recv, local) without return types