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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6
1
章
Python
ではじめる機械学習
い原因は、データにアクセスするのが遅すぎるから、というのが単純な原因として考えられます。ま
た、データを格納するためのメモリサイズが足りていないため、OSがハードディスクにデータを移し
替えていることが、時間のかかる原因かもしれません。それに加えて、Pythonはインタプリタ型の言
語であり（最適化されてあるとはいえ）、数値計算の重たい処理では、C やFortranに比べて遅いのが
現状です。それではなぜ、これほどたくさんの科学者や企業が、多くの計算処理が必要な分野で、
Pythonを使うのでしょうか？
その答えは、Pythonでは数値計算の重たい処理を、C やFortranで拡張された低レイヤーに丸投げ
することが簡単に行えるからです。これはNumPyとSciPy が実際に内部でおこなっていることでもあ
ります（
http://scipy.org/install.html
）。NumPyは最適化された多次元配列をサポート
し、最先端のアルゴリズムの多くはNumPyのデータ構造を使用しています。SciPyはNumPyのデー
タ構 造を利 用し、高 速な数 値 計 算 手 法 をいくつも 提 供します。また、Matplotlib（
http://
matplotlib.org/
）は、Pythonを使用してグラフを作成することに関して、おそらく最も便利で高
機能なライブラリです。
1.4.2
インストール方法
幸運にも、Windows、Mac、LinuxといったメジャーなOS ...
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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.