fix cuda 7.5 compile error (#9885)

Author: kexinzhao

paddle/fluid/operators/math/math_function.cu

@@ -288,9 +288,14 @@ void batched_gemm<platform::CUDADeviceContext, float16>(
   // TODO(kexinzhao): add processing code for compute capability < 53 case
   PADDLE_ENFORCE_GE(context.GetComputeCapability(), 53,
                     "cublas Hgemm requires GPU compute capability >= 53");
+
+#if CUDA_VERSION >= 8000
   PADDLE_ENFORCE(platform::dynload::cublasHgemmStridedBatched(
       context.cublas_handle(), cuTransB, cuTransA, N, M, K, &h_alpha, h_B, ldb,
       strideB, h_A, lda, strideA, &h_beta, h_C, ldc, strideC, batchCount));
+#else
+  PADDLE_ENFORCE(false, "HgemmStridedBatched is not supported on cuda <= 7.5");
+#endif
 }
 
 template <>
@@ -310,9 +315,13 @@ void batched_gemm<platform::CUDADeviceContext, float>(
       (transB == CblasNoTrans) ? CUBLAS_OP_N : CUBLAS_OP_T;
   const int strideC = M * N;
 
+#if CUDA_VERSION >= 8000
   PADDLE_ENFORCE(platform::dynload::cublasSgemmStridedBatched(
       context.cublas_handle(), cuTransB, cuTransA, N, M, K, &alpha, B, ldb,
       strideB, A, lda, strideA, &beta, C, ldc, strideC, batchCount));
+#else
+  PADDLE_ENFORCE(false, "SgemmStridedBatched is not supported on cuda <= 7.5");
+#endif
 }
 
 template <>
@@ -332,9 +341,13 @@ void batched_gemm<platform::CUDADeviceContext, double>(
       (transB == CblasNoTrans) ? CUBLAS_OP_N : CUBLAS_OP_T;
   const int strideC = M * N;
 
+#if CUDA_VERSION >= 8000
   PADDLE_ENFORCE(platform::dynload::cublasDgemmStridedBatched(
       context.cublas_handle(), cuTransB, cuTransA, N, M, K, &alpha, B, ldb,
       strideB, A, lda, strideA, &beta, C, ldc, strideC, batchCount));
+#else
+  PADDLE_ENFORCE(false, "DgemmStridedBatched is not supported on cuda <= 7.5");
+#endif
 }
 
 template <>