Minor changes to keep MAC OSX happy

sivagnanamn

2018-03-21 013031ce3f80cd3297937ae126baecf4ea63d9e8

 src/network_kernels.cu

@@ -121,7 +121,7 @@
   }
#endif
    forward_network_gpu(net, state);
   cudaStreamSynchronize(get_cuda_stream());
   //cudaStreamSynchronize(get_cuda_stream());
    backward_network_gpu(net, state);
}