move assert outside of ifdef
move assert outside of ifdef

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