Add TODO to remove warning
Add TODO to remove warning

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