karta0807913

On my ubuntu is ok use g++ g++ (Ubuntu 5.4.0-6ubuntu1~16.04.5) 5.4.0 i think you need to update your g++ to 5 or upper ``` myname:/usr/include/c++$ ls 4.9/ 4.9.3/ 5/ 5.4.0/...

that because the sigmoid function on my data will make loss to nan so i differentiate the loss function origin function  my loss function 

thanks I fixed that and I merge your pull request I'm sorry I so long to reply

oops, you're right! I will try to fix that The reason I did not change before is that I might to rewrite yolo v1 maybe I can add a new...

I just change the loss function base [this](https://github.com/yeahkun/caffe-yolo) implement so that part is yolov1 and i didn't change that

thank you @zhengstake