May 2020
Intermediate to advanced
456 pages
9h 13m
Japanese
Content preview from ゼロからはじめるデータサイエンス 第2版 ―Pythonで学ぶ基本と実践
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21.2
n-gram
モデル
■
307
求人票上の頻度
図 21-2 （見栄えは劣るが）より多くの意味を持たせたワードクラウド
21.2
n-gram
モデル
データサイエンス・スター社の検索エンジンマーケティング担当部長は、同社のサ
イトがデータサイエンス関連検索の上位となるように何千もの
Web
ページを作りたい
と考えていました（検索エンジンのアルゴリズムは洗練されているため、
Web
ページを
どれだけ多く作っても役に立たないことを説明しましたが、部長は聞く耳を持ちませ
ん で し た ）。
もちろん部長はページを何千も作りたいわけではなく、多数の「コンテンツ戦略の専
門家」に高額の報酬を払いたいとも思っていません。その代わりにプログラム的に
Web
ページを生成できないかとの相談を持ちかけられました。そのためには、言語をモデ
ル化する方法が必要です。
さまざまな文章のコーパスを作り、統計モデルを学習させる方法が考えられます。
まず手始めに
Mike Loukides
の「
What is Data Science
」（データサイエンスとは何か、
https://www.oreilly.com/ideas/what-is-data-science
）を使いましょう。
9
章で行ったように、データを読み込むために
requests
と
BeautifulSoup
ライブ
ラリを使います。いくつか注意すべき問題があります。
1
つ目の問題は、テキストに使われているアポストロフィーが
Unicode
文字の
u"\u2019"
である点です。これを通 ...
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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.