Update functions.rst
Update functions.rst

tkerola/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,chainer/chainer,chainer/chainer,ronekko/chainer,ktnyt/chainer,pfnet/chainer,jnishi/chainer,ktnyt/chainer,jnishi/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,chainer/chainer,niboshi/chainer,hvy/chainer,niboshi/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,okuta/chainer,anaruse/chainer,ktnyt/chainer,okuta/chainer,hvy/chainer,wkentaro/chainer,jnishi/chainer,wkentaro/chainer,chainer/chainer,hvy/chainer,aonotas/chainer,niboshi/chainer,rezoo/chainer,wkentaro/chainer