using ops::Stack;
using ops::StopGradient;
using ops::Unstack;
using ops::Variable;

// TODO(andydavis) Add more unit tests once more gradient functions are ported.
class GradientsTest : public ::testing::Test {
 protected:
  GradientsTest()
      : scope_expected_(Scope::NewRootScope()),
        scope_test_(Scope::NewRootScope()) {}

  void CompareTestAndExpectedGraphs() {
    GraphDef gdef_test;