code: def setUp(self):
      super(GPURasterizationBackendTest, self).setUp()
      self._backend = rasterization_backend.RasterizationBackends.OPENGL
  
imports: from tensorflow_graphics.rendering import rasterization_backend
  from tensorflow_graphics.rendering.tests import rasterization_backend_test_base
  from tensorflow_graphics.util import test_case
label_desc: Use image node_id 1 for calling the GPURasterizationBackendTest obj's underlying member method code with example usage: obj.setUp() without return types