Fix method description.
Fix method description.

hvy/chainer,niboshi/chainer,delta2323/chainer,chainer/chainer,cupy/cupy,okuta/chainer,wkentaro/chainer,okuta/chainer,kiyukuta/chainer,wkentaro/chainer,keisuke-umezawa/chainer,hvy/chainer,ysekky/chainer,kashif/chainer,cupy/cupy,ronekko/chainer,jnishi/chainer,ktnyt/chainer,chainer/chainer,tkerola/chainer,niboshi/chainer,jnishi/chainer,anaruse/chainer,aonotas/chainer,okuta/chainer,cupy/cupy,pfnet/chainer,niboshi/chainer,niboshi/chainer,rezoo/chainer,cupy/cupy,keisuke-umezawa/chainer,chainer/chainer,jnishi/chainer,wkentaro/chainer,hvy/chainer,ktnyt/chainer,wkentaro/chainer,chainer/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,ktnyt/chainer,ktnyt/chainer,jnishi/chainer,hvy/chainer,okuta/chainer