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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3.2
前処理：共通する単語の出現回数を類似度として計測する
53
ストップワードとして単語を思いつくのであれば、そのリストを
stop_words
に指定することがで
きます。ここでは、
english
と指定することで、318 個の単語をストップワードとして登録できま
す。どのような単語がストップワードとして登録されるかを見るためには、
get_stop_words()
を用
います。
>>>
sorted(vectorizer.get_stop_words())[0:20]
['a', 'about', 'above', 'across', 'after', 'afterwards', 'again', 'against',
'all', 'almost', 'alone', 'along', 'already', 'also', 'although', 'always', 'am',
'among', 'amongst', 'amoungst']
このストップワードを用いると、単語リストは全部で７つ減ります。
[u'actually', u'capabilities', u'contains', u'data', u'databases', u'images',
u'imaging', u'interesting', u'learning', u'machine', u'permanently', u'post',
u'provide', u'safe', u'storage', u'store',u'stuff', ...
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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.