CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_DeleteContextOptions(opts);

  TFE_TensorHandle* m1 = TestMatrixTensorHandle(ctx);
  TFE_TensorHandle* m2 = DoubleTestMatrixTensorHandle(ctx);
  TFE_Op* matmul = MatMulOp(ctx, m1, m2);
  TFE_TensorHandle* retvals[1] = {nullptr};
  int num_retvals = 1;
  TFE_Execute(matmul, &retvals[0], &num_retvals, status);