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I was one of the people who built the "plugin based ranking model" at Semantic Scholar as an intern several years ago; it's a rare treat to get a blog post about what happens after you leave and they need to replace your system.

Although actually I feel validated in one respect - it sounds like it took a huge amount of data cleaning and human validation to use the click log data for training.At the time we got many questions about why we didn't "just use it". Although now that I'm at a company with several orders of magnitude more traffic I am a believer in the almighty click log.