TF_Status* status = TF_NewStatus();
  TFE_ContextOptions* opts = TFE_NewContextOptions();
  TFE_Context* ctx = TFE_NewContext(opts, status);
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_DeleteContextOptions(opts);

  TFE_TensorHandle* m = TestMatrixTensorHandle(ctx);
  for (auto s : state) {
    TFE_Op* matmul = MatMulOp(ctx, m, m);
    TFE_DeleteOp(matmul);
  }
  TFE_DeleteTensorHandle(m);