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Deep Learning JP
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Pixel Shuffer
2018/05/07 Deep Learning JP: http://deeplearning.jp/hacks/
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Pixel Shuffer
1.
LT枠 Pixel Shuffler 東京大学大学院理学系研究科物理学専攻 中西 健
2.
本日紹介する関数 • chainer.functions.depth2space • chainer.functions.space2depth
3.
Pixel Shuffler とは •
Twitter社の超解像の論文で初出 https:// arxiv.org/abs/1609.05158 • 図のようにchannel方向の値を空間方向に並べ 替える
4.
Pixel Shuffler とは •
chainerではdepth2spaceという関数名 https://docs.chainer.org/en/stable/reference/generated/chainer.functions.depth2space.html
5.
depth2space • deconvolutionの代わりに使える • deconvolutionより速い(個人の感想です) convolution kernel
size=n stride=1deconvolution kernel size=rn stride=r =(端を除く) depth2space scaling factor=r
6.
depth2space • deconvolutionの問題点: uneven
overlap https://distill.pub/2016/deconv- checkerboard/ • depth2space + convolution(stride=1)なら uneven overlapが起こりえない
7.
space2depth • depth2spaceの逆 • 空間方向の値をchannel方向に並べ替える
8.
space2depth • convolutionの代わりに使える space2depth scaling factor=r convolution kernel
size=n stride=1 convolution kernel size=rn stride=r =(端を除く)
9.
まとめ • depth2spaceを使うとuneven overlapを気にし なくてよくなる •
deconvolutionを使用している部分を depth2spaceで書き直してみると速くなるかも
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