Add force_tuple argument
Add force_tuple argument

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