October 2020
Intermediate to advanced
832 pages
13h 42m
Japanese
Content preview from scikit-learn、Keras、TensorFlowによる実践機械学習 第2版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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付録D自動微分
この付録では、TensorFlowの自動微分機能の仕組みを説明し、ほかのソリューションと比較する。
という関数を定義し、勾配降下法（またはその他の最適化アルゴリズム）を実行するために、その偏微分
と
が必要になったとする。その場合、選択肢は、手計算による微分、有限差分近似、フォワードモード自動微分、リバースモード自動微分である。TensorFlowが実装しているのは、この最後のオプションだ。それでは、これらのオプションを1つずつ見ていこう。
D.1 手計算による微分
第1のアプローチは、紙と鉛筆を取り出し、自分の解析学の知識を駆使して手計算で偏導関数を導き出すことだ。今定義した
関数なら、それほど難しいことではない。5つの規則に従えばよい。
- 定数の導関数は0。
- の導関数は（ただし、 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.