Merge branch 'goby_work' of https://github.com/jackkitte/DeepLearnToolbox into goby_work

・warning: implicit conversion from real matrix to real scalar
・上記のワーニングをはくのでnnffでのrand関数において()を追加した
Merge branch 'goby_work' of https://github.com/jackkitte/DeepLearnToolbox into goby_work