Additional backward checks with scalar on both lhs and rhs
Additional backward checks with scalar on both lhs and rhs

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