Tag Archives: go

關於圍棋貼目的問題...

Posted on June 12, 2017 by Gea-Suan Lin

前陣子 AlphaGo 大獲全勝後放出了五十盤自戰棋譜 (兩台 AlphaGo 自己下)，其實有件事情有點出乎大家意料，而在圍棋界被一直討論。就是在這五十盤裡，黑棋與白棋的勝率比是 12:38 (中國規則，黑棋貼 7.5 目的情況)，明顯白棋有強大的優勢。 這個 7.5 目指的是，由於黑棋先下 (先手優勢)，所以圍的地會比較多，為了彌補白棋後下的這個缺點，一般都會設計「貼目」這個規則。 交大資工的 CGI 團隊在上個月月底發了一篇論文 (參考「CGOS Whole Period Ratings for 19x19 Board」這邊的記錄，在有參加 CGOS 的團隊裡只輸新版的 Zen)，討論 value network 的新想法：「Multi-Labelled Value Networks for Computer Go」。 他們對貼目的數量做了分析： For the training data, … Continue reading →

Posted in Computer, Game, Go, Lab, Murmuring, NCTU, Programming, Recreation | Tagged , , , , , , , , , , | Leave a comment

zetcd：用 etcd 跑 ZooKeeper 架構

Posted on May 20, 2017 by Gea-Suan Lin

在「zetcd: running ZooKeeper apps without ZooKeeper」這邊介紹了用 etcd 當作 ZooKeeper 伺服器。程式碼在「Serve the Apache Zookeeper API but back it with an etcd cluster」這邊可以看到。 不過可以看到有不少 overhead： 但 etcd 用 Go 寫 (省下 JVM tuning？)，可能是個不錯的誘因...

Posted in Computer, Murmuring, Network, Software | Tagged , , , , , , , , , , , , | Leave a comment

用 Go 寫的 Badger

Posted on May 18, 2017 by Gea-Suan Lin

Dgraph 在推銷自家發展出來的 Badger：「Introducing Badger: A fast key-value store written natively in Go」。 標靶是 RocksDB，號稱比 RocksDB 快好幾倍： Based on benchmarks, Badger is at least 3.5x faster than RocksDB when doing random reads. For value sizes between 128B to 16KB, data loading … Continue reading →

Posted in Computer, Library, Murmuring, Programming, Software | Tagged , , , , , , , , , , , , , , | Leave a comment

Linux 上跑電腦圍棋程式 (CGOS)

Posted on May 15, 2017 by Gea-Suan Lin

這邊講的不是對人下的，而是電腦之間的對弈。 目前大多數的對弈軟體會到「CGOS - A Go Server Just for Computers」這邊對弈，當然目前最紅的是一般 (人類) 正式比賽用的 19x19 棋盤，數子採用中國規則 (相當於貼 7.5 目)。 不過與常見的正式比賽比較不一樣的是採用包干制，每方限時 15 分鐘，超時就直接裁定敗，不過有個小例外： CGOS silently adds a fraction of a second to each players clock for each move played. 要把圍棋程式接到 CGOS 上面需要兩段程式，一段是 Go Engine … Continue reading →

Posted in Computer, Game, Murmuring, Network, Recreation, Software | Tagged , , , , , , , , , | Leave a comment

AlphaGo 又要重出江湖了

Posted on April 10, 2017 by Gea-Suan Lin

DeepMind 家的 AlphaGo 又要重出江湖了：「Exploring the mysteries of Go with AlphaGo and China's top players」。這次將會跟中國的頂尖職業棋手對弈，裡面提到三種賽制： The summit will feature a variety of game formats involving AlphaGo and top Chinese players, specifically designed to explore the mysteries of the game together. The … Continue reading →

Posted in Computer, Game, Murmuring, Recreation, Science | Tagged , , , , | Leave a comment

Cloudflare 因為閏秒炸掉...

Posted on January 2, 2017 by Gea-Suan Lin

Cloudflare 這次閏秒炸掉：「How and why the leap second affected Cloudflare DNS」，影響範圍包括了 DNS query 與 HTTP request： At peak approximately 0.2% of DNS queries to Cloudflare were affected and less than 1% of all HTTP requests to Cloudflare encountered an error. 主要的原因在於 … Continue reading →

Posted in CDN, Cloud, Computer, DNS, Murmuring, Network, Programming, Software, WWW | Tagged , , , , , , , , , | Leave a comment

Golang 本身也出字型了...

Posted on November 21, 2016 by Gea-Suan Lin

不愧是 Google 在後面撐腰，Golang 找人設計了一整套字型，叫做「Go fonts」： The Go fonts are divided into two sets, Go proportional, which is sans-serif, and Go Mono, which is slab-serif. 不過看了一下 monospace 的部份，有點微妙： 其他兩個也許哪天換心情來用看看好了 :o

Posted in Computer, Murmuring, Programming | Tagged , , | Leave a comment

Go 1.9 的 GC 改善

Posted on October 29, 2016 by Gea-Suan Lin

Update：被提醒後仔細看了一下，是 1.8 預設生效 (但保留選項切回來 debug)，如果沒問題的話 1.9 把舊的方式拔乾淨： Assuming things go smoothly, we will remove stack re-scanning support when the tree opens for Go 1.9 development. 標題就不改了... 以下原文。 在「Sub-millisecond GC pauses」這邊看到的。Golang 想辦法將 GC 造成的影響降低：「Proposal: Eliminate STW stack re-scanning」。 目標是解決最大的 GC pause … Continue reading →

Posted in Computer, Murmuring, Programming, Software | Tagged , , , , , , , , , , , , | Leave a comment

玩 Pokémon Go 抓怪用的 iPhone 手機殼...

Posted on September 2, 2016 by Gea-Suan Lin

看到「This iPhone thong case will help you catch 'em all in 'Pokémon Go'」這個，光看圖就知道意思了： 應該是用 3D Printer 做出來的： If this sounds familiar, it's basically the commercialized, rubberized version of the 3D-printed Poké Ball "aimer" case that one guy made. 不過這不能丟 Curveball … Continue reading →

Posted in Computer, Game, Hardware, Murmuring, Recreation | Tagged , , , , , , | Leave a comment

Golang 1.7

Posted on August 19, 2016 by Gea-Suan Lin

Golang 1.7 主打更小的 binary size：「Smaller Go 1.7 binaries」： Typical programs, ranging from tiny toys to large production programs, are about 30% smaller when built with Go 1.7. 還附了一張經典的「Hello, world」程式的分析： 由於現代 CPU 的速度與 L1/L2/... cache 有緊密關係，當 binary size 變小時，常常會伴隨著 memory access … Continue reading →

Posted in Computer, Murmuring, Programming, Software | Tagged , , , , , | Leave a comment