Changed int -> int64_t for shape dimensions
Changed int -> int64_t for shape dimensions

hvy/chainer,wkentaro/chainer,hvy/chainer,wkentaro/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,pfnet/chainer,niboshi/chainer,niboshi/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,wkentaro/chainer,chainer/chainer,hvy/chainer,wkentaro/chainer