add assert
add assert

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