Add TODO to not use unordered_map
Add TODO to not use unordered_map

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