Created by: NHZlX

When we create two predictor on difference card, there is the bug:

For example:

void PrepareTRTConfig(AnalysisConfig *config, int batch_size, int id = 1) {
  config->SetModel(FLAGS_dirname + "/model",
                     FLAGS_dirname + "/params");
  config->EnableUseGpu(100, id);
  config->SwitchUseFeedFetchOps(false);
}

bool test_map_cnn(int batch_size, int repeat) {
  // create the predictor 1
  AnalysisConfig config;
  PrepareTRTConfig(&config, batch_size);
  auto predictor = CreatePaddlePredictor(config);

  // create the predictor 2
  AnalysisConfig config1;
  PrepareTRTConfig(&config1, batch_size, 2);
  auto predictor1 = CreatePaddlePredictor(config1);
  ....
  return true;
}