protection of cuda code

Merge branch 'xiaotong-working' of 47.105.50.196:NiuTrans/NiuTrans.Tensor into xiaotong-working

# Conflicts:
#	.gitignore

source/tensor/core/arithmetic/MatrixMulBatched.cpp

@@ -186,6 +186,7 @@ void _MatrixMulBatchedGPU(const XTensor * a, MATRIX_TRANS_TYPE transposedA,
                           const XTensor * b, MATRIX_TRANS_TYPE transposedB,
                           XTensor * c, DTYPE alpha, DTYPE beta, XPRunner * parallelRunner)
 {
+#ifdef USE_CUDA
     CheckNTErrors((a && b && c), "Empty input tensors!");
     CheckNTErrors((a->dataType == b->dataType && a->dataType == c->dataType),
                   "Input tensors should have the same data type!");
@@ -226,6 +227,7 @@ void _MatrixMulBatchedGPU(const XTensor * a, MATRIX_TRANS_TYPE transposedA,
                                     a->dimSizeRDI[1], a->dimSizeRDI[0],
                                     b->dimSizeRDI[1], b->dimSizeRDI[0],
                                     c->dimSizeRDI[1], c->dimSizeRDI[0], alpha, beta);
+#endif
 
 }