April 2020
Intermediate to advanced
552 pages
6h 13m
Japanese
Content preview from ゼロから作るDeep Learning ❸ ―フレームワーク編
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ステップ13可変長の引数（逆伝播編）
前ステップまでの変更により、関数の入出力は複数取れるようになりました。そこでは、順伝播の実装を変更し、正しい計算ができることを確認しました。順伝播の次は、もちろん「逆伝播」です。本ステップでは、逆伝播の実装を行います。
13.1 可変長引数に対応したAddクラスの逆伝播
逆伝播の実装を行うにあたり、まずは図13-1の足し算の計算グラフを見てみましょう。
図13-1 足し算を行う計算グラフの順伝播と逆伝播（y = x0 + x1の微分を求める関数は+'で表す）
図13-1のとおり、足し算の順伝播は入力が2つ、出力が1つです。逆伝播時は、それが逆になり、入力が1つ、出力が2つになります。数式で確認すると、
のとき、微分の公式より
、
と求められます。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.