code: def test_copy_gradient_gpu(self):
      self.run_test_copy_gradient(
          core.DeviceOption(workspace.GpuDeviceType, 0)
      )
  
file_path: pytorch/caffe2/python/operator_test/copy_ops_test.py
imports: import numpy
  import unittest
  from caffe2.proto import caffe2_pb2
  from caffe2.python import workspace, core, model_helper, brew, test_util
label_desc: Use image node_id 4 for calling the CopyOpsTest obj's underlying member method code with example usage: obj.test_copy_gradient_gpu() without return types