自然言語処理のときに使う機械学習手法のテクニックをざーっと2時間程度で紹介してほしいとのことだったので今日話してきました。基本的に、そんなに頑張らなくても効果が大きいものを中心に説明(特にパーセプトロンとか)を説明してます。 紹介した手法はパーセプトロン、最大エントロピー、正則化、多クラス分類、系列分類(CRF, Structured Perceptron)などなどです。どれも一かじりする感じで網羅的に見る方を優先してます。個々の詳しい話はそれぞれの文献や実装などを当たってみてください。 スライド [ppt] [pdf] ここで話しているのは線形識別モデルの教師有り学習が中心で教師無し学習(クラスタリングなど)など他の自然言語処理を支える技術は省いてます。 こういうのを使って(使わなくてもいいけど)どんどんアプリケーション作らないといかんね。 Tarot is not used to ma
This is the companion website for the following book. Christopher D. Manning, Prabhakar Raghavan and Hinrich Schütze, Introduction to Information Retrieval, Cambridge University Press. 2008. You can order this book at CUP, at your local bookstore or on the internet. The best search term to use is the ISBN: 0521865719. The book aims to provide a modern approach to information retrieval from a co
Topcoder is a crowdsourcing marketplace that connects businesses with hard-to-find expertise. The Topcoder Community includes more than one million of the world’s top designers, developers, data scientists, and algorithmists. Global enterprises and startups alike use Topcoder to accelerate innovation, solve challenging problems, and tap into specialized skills on demand.
by Mark Walters Representing exact geographic locations on the earth, or geocoding, has become a popular topic lately. All the mapping service providers, such as Google, MapQuest, and Yahoo!, geocode addresses on their respective maps so you can easily see a specific location and get directions between multiple locations. With each of these services now providing public APIs, anyone can create mas
HIGH DYNAMIC RANGE PHOTOGRAPHY High dynamic range (HDR) images enable photographers to record a greater range of tonal detail than a camera could capture in a single photo. This opens up a whole new set of lighting possibilities which one might have previously avoided — for purely technical reasons. The new "merge to HDR" feature of Photoshop accomplishes this by combining a series of bracketed ex
GPU Gems is now available, right here, online. You can purchase a beautifully printed version of this book, and others in the series, at a 30% discount courtesy of InformIT and Addison-Wesley. Please visit our Recent Documents page to see all the latest whitepapers and conference presentations that can help you with your projects. Part I: Natural Effects Special effects have differentiated real-ti
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