Fix default initializer of LSTM
Fix default initializer of LSTM

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