Use MultiprocessIterator in captioning example
Use MultiprocessIterator in captioning example

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