Output in = ops::Placeholder(root, DT_FLOAT);
  Output perm = ops::Const(root, {3, 1, 2, 0});

  NameAttrList b_name_attr;
  b_name_attr.set_name("TransposeCall");
  ops::PartitionedCall call(root.WithOpName("call"), {in, perm}, {DT_FLOAT},
                            b_name_attr);
  call.output.front().node()->AddAttr(kXlaMustCompileAttr, true);

  std::unique_ptr<Graph> graph;

}

TEST_F(GradientsTest, UnreachableInput) {
  auto x = Const(scope_test_, {{1.0, 2.0, 3.0}, {4.0, 5.0, 6.0}});
  auto y = Const(scope_test_, {{1.0}, {2.0}, {3.0}});
  auto z = Const(scope_test_.WithOpName("z"), {{9.0, 10.0, 11.0}});

  auto m1 = MatMul(scope_test_, x, y);
  auto m2 = MatMul(scope_test_, y, z);
  auto dm1 = Const(scope_test_, {{0.5}, {0.5}});