message: Put sparse_xent gpu benchmarks under #ifdef
diff: @@ -49,6 +49,7 @@ static Graph* SparseXent(int batch_size, int num_classes) {
  BENCHMARK(BM_SparseXent##_##BATCH##_##CLASS##_##DEVICE);
  /// The representative tests for ptb_word on GPU
  +#ifdef GOOGLE_CUDA
  BM_SparseXentDev(8, 1000000, gpu);
  BM_SparseXentDev(16, 10000, gpu);
  @@ -62,6 +63,7 @@ BM_SparseXentDev(32, 100000, gpu);
  BM_SparseXentDev(64, 10000, gpu);
  BM_SparseXentDev(64, 30000, gpu);
  BM_SparseXentDev(64, 100000, gpu);
  +#endif // GOOGLE_CUDA
  // CPU
  BM_SparseXentDev(8, 1000000, cpu);
  