handle list of list properly
handle list of list properly

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