Throw errors instead of asserts
Throw errors instead of asserts

hvy/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,hvy/chainer,pfnet/chainer,chainer/chainer,wkentaro/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,niboshi/chainer,niboshi/chainer,niboshi/chainer,okuta/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,hvy/chainer,okuta/chainer,chainer/chainer