Fix bias tensor descriptor.
Fix bias tensor descriptor.

keisuke-umezawa/chainer,okuta/chainer,niboshi/chainer,niboshi/chainer,ysekky/chainer,chainer/chainer,keisuke-umezawa/chainer,chainer/chainer,wkentaro/chainer,ronekko/chainer,kiyukuta/chainer,ktnyt/chainer,hvy/chainer,tkerola/chainer,jnishi/chainer,chainer/chainer,chainer/chainer,jnishi/chainer,ktnyt/chainer,rezoo/chainer,wkentaro/chainer,anaruse/chainer,kashif/chainer,hvy/chainer,cupy/cupy,hvy/chainer,hvy/chainer,wkentaro/chainer,niboshi/chainer,keisuke-umezawa/chainer,jnishi/chainer,okuta/chainer,keisuke-umezawa/chainer,pfnet/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,cupy/cupy,okuta/chainer,ktnyt/chainer,cupy/cupy,delta2323/chainer,cupy/cupy,niboshi/chainer,okuta/chainer,aonotas/chainer