use `cache.cached_property`
use `cache.cached_property`

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