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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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.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.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.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.
5.3
データを用意する
87
5.3.2
必要な属性の選別
ここで私たちがすべきことは、XMLファイルにおいて良い回答を分類するために役立つ属性だけを
残すことです。必要な属性には、たとえば、投稿文書（回答または質問）の
id
があるでしょう。もしそ
れがなければ、回答をそれが対象とする質問に対応づけることもできません。ここでは次に挙げる属
性について、それが必要かどうかそれぞれ考えたいと思います。
●
PostTypeId
という属性は、その文書が回答か質問かを見分けるためにだけ必要です。さら
に、
ParentId
という属性が存在するかどうか確認するために、この属性を用いることができま
す。そのため、この属性は残すことにします。ちなみにこの
PostTypeId
が1の場合、文書タ
イプが質問であることを示します。
●
CreationDate
という属性は、文書（質問または回答）が投稿された日時を示します。質問が
投稿さ
れてから各回答が投稿されるまでの時間を求めれば、それは良い回答を分類するために有
効かもしれません。そのため、この属性は残すことにしましょう。
●
Score
という属性は、もちろん、コミュニティからの評価を示す大切な指標です。
●
ViewCount
という属性は、私たちが取り組む課題に対して、ほとんど役に立ちそうにありませ
ん。もし分類器が良い回答を分類するのに役立てることができたとしても、回答が投稿された時
点ではこの属性は
0
であり、情報を持ちません。そのため、この属性は用いないことにします。
●
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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.