Assume optional is never nullopt and get value
Assume optional is never nullopt and get value

jnishi/chainer,okuta/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,wkentaro/chainer,okuta/chainer,jnishi/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,ktnyt/chainer,niboshi/chainer,wkentaro/chainer,wkentaro/chainer,okuta/chainer,ktnyt/chainer,chainer/chainer,tkerola/chainer,keisuke-umezawa/chainer,chainer/chainer,jnishi/chainer,ktnyt/chainer,wkentaro/chainer,pfnet/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,ktnyt/chainer