October 2014
Intermediate to advanced
288 pages
6h 27m
Japanese
Content preview from 実践 機械学習システム
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8.2
バスケット分析
165
だったので、驚くことではないでしょう）。そして、2 番目の手法（ユーザの関連性に基いて二値行列か
ら予測を行う手法）は最終結果にほとんど影響を与えないため、学習の段階でそれを用いないようにす
ることもできます。
このコードに従えば、他のアイデアを追加して検証することは簡単に行えます。たとえば、最も類似
した映画を一本だけ用いて予測を行う手法が良かった場合、類似した順に映画を5本選び出し、それ
らを用いて予測を行う方法はどうでしょうか？ 先ほどのコードにそれを適用するために、k番目までの
似ている映画を用いて予測する手法を実装し、重みを学習させるために、以下の部分を変更します。
es = [
usermodel.estimate_all(),
similar_movie.estimate_all(k=1),
similar_movie.estimate_all(k
=2),
similar_movie.estimate_all(k=3),
similar_movie.estimate_all(k=4),
similar_movie.estimate_all(k=5),
]
#
残りは先ほどと同じ！
これで新しい機械学習システムを作り出すために、かなりの自由を手にしました。この場合、最終
結果は良くありませんが、新たなアイデアを簡単にテストすることができます。
しかし、注意点として、データセットに対して過学習にならないようにしなければなりません。実
際、あまりに多くのことをラ
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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.