November 2017
Intermediate to advanced
328 pages
6h 51m
Japanese
Content preview from 入門 PySpark ―PythonとJupyterで活用するSpark 2エコシステム
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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.
7.11
幅優先検索の利用
145
このクエリからわかるとおり、最も頻繁なノンストップフライトの上位 2つは LAX（ロサンジェルス）
とSFO（サンフランシスコ）間のフライトです。これらのフライトがこれほど頻繁だということは、航
空マーケットにおけるこれらの空港の重要性を示しています。2016 年4 月4日号のニューヨークタイム
ズの記事に書かれているとおり、アラスカ航空はバージンアメリカをウェストコーストへの鍵だと見な
しており（http://nyti.ms/2ea1uZR）、バージン航空をアラスカ航空が買収した理由の 1つは、この 2つ
の空港のスロットを獲得することだったのです。グラフだけを見てみてもおもしろくはありませんが、
その中にはビジネス上の強力な知見が潜んでいるのです！
7.11
幅優先検索の利用
幅優先検索（Breadth-First Search = BFS）はGraphFramesの新しいアルゴリズムの 1つで、頂点
の1つの集合から別の集合への最短経路を見つけ出してくれます。このセクションでは、BFSを使って
tripGraph
をトラバースして目的の頂点（空港）と辺（フライト）を見つけることにします。さあ、本
章のデータセットに基づき、都市間の最短の経路を見つけ出してみましょう。ただし、この例では時間
や距離は考慮せず、都市間のホップ数だけを見ていることに注意してください。たとえば、シアトルと
サンフランシスコ間の直接のフライト数は、次のクエリでわかります。
# SEA
と
SFO
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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.