[GitHub] [singa] dcslin commented on a change in pull request #758: update roundeven backend algorithm

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dcslin commented on a change in pull request #758:
URL: https://github.com/apache/singa/pull/758#discussion_r449322587



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File path: src/core/tensor/math_kernel.cu
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@@ -140,7 +140,12 @@ __global__ void KernelRound(const size_t n, const float *in, float *out) {
 __global__ void KernelRoundE(const size_t n, const float *in, float *out) {
   for (int i = blockIdx.x * blockDim.x + threadIdx.x; i < n;
        i += blockDim.x * gridDim.x) {
-    out[i] = roundf(in[i]/2)*2;
+    auto doub = in[i]*2;

Review comment:
       Thank you Chris for the prompt response! I could also replace the `auto` in this PR. Yes I think updating to newer gcc is a good idea, although the "new"(c++11) one is already widely used and not that new, it would be helpful to support running c++11 code. 




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