リンク解析とか: 重要度尺度と von Neumann カーネル - smly’s notepad
NAIST の入学手続を終えた. 残りの期間はサーベイするぞーということで shimbo 先生の講義資料「リンク解析とその周辺の話題」を読んでいます. 一日目, 二日目の資料は PageRank, HITS, SALSA などの重要度尺度の紹介と, von Neumann Kernels と HITS の関係についてのお話が中心. これらを実装してみた. 後半に進むほど力尽きて記述が適当になってます:)PageRankポイントはランダム遷移行列による random walk では定常分布に収束しない (エルゴード性 (ergodic) を満たさない) という点. どうして満たさないかというと. sink (出次数のない節点) が存在するとき, 明らかに既約 (irreducible) でないのでエルゴード性を満たさない. 複数の強連結成分を持つケース => 周期性を持つと考えてよい? 周期
はてなグループの終了日を2020年1月31日(金)に決定しました - はてなの告知
はてなグループの終了日を2020年1月31日(金)に決定しました 以下のエントリの通り、今年末を目処にはてなグループを終了予定である旨をお知らせしておりました。 2019年末を目処に、はてなグループの提供を終了する予定です - はてなグループ日記 このたび、正式に終了日を決定いたしましたので、以下の通りご確認ください。 終了日: 2020年1月31日(金) エクスポート希望申請期限:2020年1月31日(金) 終了日以降は、はてなグループの閲覧および投稿は行えません。日記のエクスポートが必要な方は以下の記事にしたがって手続きをしてください。 はてなグループに投稿された日記データのエクスポートについて - はてなグループ日記 ご利用のみなさまにはご迷惑をおかけいたしますが、どうぞよろしくお願いいたします。 2020-06-25 追記 はてなグループ日記のエクスポートデータは2020年2月28
Spin cycle: a new kind of washer
In many developing countries, electricity is unreliable or unavailable and water must be carried by hand, so conventional modern washing machines are not an option. Washing clothes can take up a significant amount of time, and doing laundry in open streams or lakes can add to water pollution, so the availability of a human-powered washing machine could make a big difference to the quality of life.
10 Features That Will Make Twitter Better
President of WebFX. Bill has over 25 years of experience in the Internet marketing industry specializing in SEO, UX, information architecture, marketing automation and more. William’s background in scientific computing and education from Shippensburg and MIT provided the foundation for MarketingCloudFX and other key research and development projects at WebFX. Twitter‘s popularity has skyrocketed i
Get to know a gem: Ghost : Robby on Rails :
In my last post, Subdomain accounts with Ruby on Rails explaind, I mentioned that you’d need to modify your /etc/hosts file to use custom subdomains for development/testing. Apparently, there is a much better way to handle this that I was introduced to by Nathan de Vries. Nathan suggests using a gem that I hadn’t heard of before that bares the name of Ghost (view project on github). Ghost describe
TED talk: Twitter & the power of the unexpected
You never know how users will end up using your technology. Sometimes they end up using your product in creative ways that you could not possibly have thought of on your own. This is why many entrepreneurs learned to embrace the idea of "letting a thousand flowers bloom," an idea that people like Guy Kawasaki have been preaching seemingly forever. "When people use your product in an entirely new w
Just add water
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How To Start A Rails Edge App The Easy Way · devroom.io
There’s a lot of cool stuff pooring in about what’s new in Rails Edge (which will become Rails 2.3 and/or Rails 3). Most likely you can’t wait to get started with these new features, especially when you’re about to start a new project, which doesn’t have to be stable yet, but will be by the time 2.3/3.0 come out. This post shows you the way to create a new Rails app based on the most current Rails
Deploying Sinatra with Vlad
So you've just written a nice new Sinatra application, and you want to get it running on your web server. How hard can it be? Well with Vlad the Deployer, it's actually rather easy. Creating a sample application Let's start by making ourselves a test app: $ mkdir hello $ cd hello $ touch app.rb Open app.rb in your editor and put this code in it: require "rubygems" require "sinatra" get "/" do "Hel
Deploying Merb with Vlad
You've built your Merb app, and you want to get it running on your web server. You could use Capistrano, but if you prefer the simple things in life you might find that Vlad is a better fit. This is a Merb version of the Deploying Sinatra with Vlad article that I wrote yesterday. There are big similarities to that article, but in this one we also look at how to restart Merb automatically after the
Is anyone using ESI with a lot of traffic?
John Adams jna at twitter.com Fri Feb 27 23:24:34 CET 2009 Previous message: Is anyone using ESI with a lot of traffic? Next message: Is anyone using ESI with a lot of traffic? Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] cc'ing the varnish dev list for comments... On Feb 27, 2009, at 1:33 PM, Cloude Porteus wrote: > John, > Goodto hear from you. You must be slammed at Twitter.
Ruby Central
Matz Has a Mac! February 26, 2009 With the recent rise to prevalence of Ruby as a development language for the Mac OS as well as the promise of the nascent MacRuby implementation, it was only fitting that the creator of Ruby have a Mac. After a discussion with him at RubyConf, Ruby Central purchased and sent Matz a new Mac. This is Matz, full of smiles, with his new Macbook Pro.
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The constant hunt for more efficient and useful ways to use these 3d printers keeps turning up interesting results...
acts_as_ferric : Caching with Ruby on Rails
I wrote this for the Rails Guides project. Most updated version should always be at: Rails Guides. Comment on HN Caching with Rails: An overview Everyone caches. This guide will teach you what you need to know about avoiding that expensive round-trip to your database and returning what you need to return to those hungry web clients in the shortest time possible. Basic Caching This is an introducti
Dr Nic » [ANN] Generating new gems for graceful goodliness
Dr. Nic is the CEO and founder of Stark & Wayne. He previously served as both VP of Technology and VP of Engineering at Engine Yard. He discovered Cloud Foundry in 2011, and launched Stark & Wayne in 2012 to help the enterprise world with successfully running application container platforms. Dr Nic is a heavy user and evangelist of Cloud Foundry, Kubernetes, Rancher, Concourse CI, and BOSH. He is
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Rails 2.3 Upgrade Problems and Solutions | Sudothinker
Cucumber This fix will address “undefined method `visits’ for # (NoMethodError)” # features/env.rb require 'webrat/rails' Webrat.configure do |config| config.mode = :rails end Gems This fix will address “uninitialized constant RedCloth (NameError)” # config/environment.rb config.gem "RedCloth", :lib => "redcloth", :source => "http://code.whytheluckystiff.net" rake gems:unpack rake gems:build Form
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ZenTest version 4.0.0 has been released! | software releases | by ryan davis