November 2018
Intermediate to advanced
272 pages
6h 51m
Japanese
book
エレガントなSciPy ―Pythonによる科学技術計算
by Juan Nunez-Iglesias, Stéfan van der Walt, Harriet Dashnow, 山崎 邦子, 山崎 康宏
Content preview from エレガントなSciPy ―Pythonによる科学技術計算
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236
エピローグ
product/0636920033431.do
、
O'Reilly
、
2015
、邦題『
Cython : C
との融合による
Python
の高速
化』オライリー・ジャパン）で、この言語の基本を教えてくれます。
Cython
よりも簡単に使える代替言語は、
Numba
という配列ベースの
Python
用の実行時（
just-
in-time
、
JIT
）コンパイラです。
JIT
は、ある関数が一度実行されるのを待ち、その時点ですべての
関数の引数と出力の型を類推し、その特定の型にとって非常に効率的な形にコードをコンパイル
します。
Numba
のコードでは、型を宣言する必要がありません。関数が初めて呼び出されたとき
に、
Numba
が自分で類推するからです。その代わり、より複雑な
Python
のオブジェクトは使わ
ず、基本の型（整数や浮動小数点数など）や配列だけを使うように注意する必要があるだけです。
そうすれば、
Numba
は
Python
のコードを非常に効率的なコードにコンパイルして、計算速度を
何桁も高速にします。
Numba
はまだとても若い言語ですが、すでにとても便利な言語なのです。重要なことに、
Numba
は、これからもっと一般的になることが決まっている
Python
の
JIT
で可能なことを示し
てくれています。「もっと一般的になることが決まっている」と述べたのは、
Python 3.6
では、新
しい
JIT
（
Pyjion
の
JIT
はこれらに基づいています）を使いやすくする機能が追加されたからで
す。
Numba
を
SciPy
に組み合わせる方法など ...
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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.