昨天在 Hacker News 首頁上看到「Tracking the Fake GitHub Star Black Market (dagster.io)」這篇，原文在「Tracking the Fake GitHub Star Black Market with Dagster, dbt and BigQuery」這邊。

作者群想要偵測 GitHub 上面 fake star 的行為，所以就跑去找黑市買，然後找到了兩家，Baddhi Shop (1000 個 $64) 與 GitHub24 (每個 €0.85，大約是 $0.91)，價錢差異很大，「品質」差異也很大：貴的 star 在一個月後還是存在，而便宜的看起來有一些有被 GitHub 偵測到而清除掉：

A month later, all 100 GitHub24 stars still stood, but only three-quarters of the fake Baddhi Shop stars remained. We suspect the rest were purged by GitHub’s integrity teams.

接下來就是想要系統化分析，切入點是 GH Archive 這個服務，可以直接下載 GitHub 全站上的 public evnets 資料：

GH Archive is a project to record the public GitHub timeline, archive it, and make it easily accessible for further analysis.

想要偵測兩種不同的 fake account，第一種是 obvious fake account，定義成這樣：

• Created in 2022 or later
• Followers <=1
• Following <= 1
• Public gists == 0
• Public repos <=4
• Email, hireable, bio, blog, and twitter username are empty
• Star date == account creation date == account updated date

從定義就可以看出來完全就是灌水帳號，開出來就沒在動的。從 screenshot 可以看出這種帳號長的都一樣：

另外一種則是透過演算法去分析，這邊拿 unsupervised clustering 類的演算法分析出來的結果，可以看到抓到很多：

最近 NN 類的 machine learning 演算法太多，看到這些傳統的 machine learning 演算法還是覺得頗新鮮的...

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