Use dict to concat dataset
Use dict to concat dataset

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