Gauthier-Clerc François

same with my Kubuntu 17.10. ``` [18624:1231/143702:ERROR:browser_main_loop.cc(170)] Running without the SUID sandbox! See https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment for more information on developing with the sandbox on. [18624:1231/143702:ERROR:browser_main_loop.cc(216)] Gtk: Impossible de trouver le moteur...

The key idea here is to compute the grad on real weight value. So he uses an intern parameter .org to save the real weight value during the forward pass....