code: def GIS(op):
      """A test util function to generate the gradient name for input."""
      return [s + "_grad" for s in op.input]
  
imports: from hypothesis import given, settings
  import hypothesis.strategies
  import unittest
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core, test_util, workspace
  from caffe2.python.core import CreateOperator, GradientRegistry, IR
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: GIS(op) and returns: unknown