Revert "Fix asserts"
Revert "Fix asserts"

This reverts commit 388d8f77df9dc74bda68d7207a7240821cfb8d30.

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