July 2014
Beginner to intermediate
456 pages
11h 26m
Japanese
Content preview from 戦略的データサイエンス入門 ―ビジネスに活かすコンセプトとテクニック
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385
385
14.6 最後に
し、ヘイトスピーチ分類器を構築します。しかし残念なことに、トレーニングデータとして
利用することができそうな、ヘイトスピーチの代表的なサンプルは手元にありません。とは
いえ、この問題を解決することが重要であるならば
†
、ヘイトスピーチを含んだページを識別
するモデルを構築できるかどうかを見極めるために、ラベル付けされたデータを収集するこ
とへの投資を検討するべきでしょう。
このラベル付きトレーニングデータを収集するという例において、クラウドソーシング
（
cloud-sourcing
）はデータへの投資を行う際の経済性を変化させます。今ではデータへ投
資をする際に安価な労働力を雇いたければ、インターネットを経由してさまざまな方法を使
うことができます。例えば、
Amazon Mechanical Turk
上に存在する労働者の方々に依頼し
て、ページを好ましいかどうかラベル付けしてもらうことで、目的変数のラベルを収集する
ことができます。これは学生のアルバイトを雇うよりもずっと安いでしょう。
成功報酬に関する補足ですが、例えばトレーニングを行ったインターンであれば、
1
時間
に
250
の
Web
サイトをチェックし、それに対して時給
15
ドルを支払うことになります。
一方、
Amazon Mechanical Turk
にタスクを登録する場合は、ラベル付けの効率は
1
時間当
たり
2,500
サイトになり、必要なコストの総額はインターンに依頼した場合と同じままです
［
Ipeirotis, P. 2010
］。 ...
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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.