code: def _NumpySubScalar(ref, indices, update):
      for _, indx in np.ndenumerate(indices):
          ref[indx] -= update
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import ref_variable
  from tensorflow.python.ops import state_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling a global function with example usage: _NumpySubScalar(ref, indices, update) without return types