Add weight parameter via Link's initializer method with specifying dtype.
Add weight parameter via Link's initializer method with specifying dtype.

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