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Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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ステップ5バックプロパゲーションの理論
私たちは数値微分によって微分を求めることができました。しかし、数値微分には計算コストと精度の点で問題がありました。バックプロパゲーションは、その2つの問題を解決します！ つまりは、微分を効率良く求めることができる上に、より誤差の小さい値を得ることができるのです。本ステップは、バックプロパゲーションの実装は行わずに理論の説明だけに留めます。そして、次のステップからバックプロパゲーションの実装を行っていきます。
5.1 チェインルール
バックプロパゲーションを理解する上でキーとなるのがチェインルール（連鎖律）です。チェイン（chain）とは「鎖」を意味し、複数の関数が連結して使われる様子を表します。チェインルールは、その連結した複数の関数（合成関数）の微分が、それを構成する各関数の微分の積へと“分解”できることを表します。
チェインルールについて具体例を出して説明しましょう。たとえばここに、
という関数があるとします。そして、この関数
が、
、、の3つの関数によって構成されているとしましょう。ちなみに、この関数は計算グラフで書くと、 ...
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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.