In the StreamExecutor, make lack of CUDA 7.5 a non-fatal error for SGEMM

A. Unique TensorFlower · tensorflower-gardener · commit cfa7ffbbd81f · 2016-05-13T14:42:47.000-07:00
(ie., propagate the error better).
Change: 122297193
diff --git a/tensorflow/stream_executor/cuda/cuda_blas.cc b/tensorflow/stream_executor/cuda/cuda_blas.cc
@@ -1685,8 +1685,9 @@ bool CUDABlas::DoBlasGemm(
       &beta,
       CUDAMemoryMutable(c), CUBLAS_DATA_HALF, ldc);
 #else
-  LOG(FATAL) << "fp16 sgemm is not implemented in this cuBLAS version "
+  LOG(ERROR) << "fp16 sgemm is not implemented in this cuBLAS version "
              << "(need at least CUDA 7.5)";
+  return false;
 #endif
 }
 
