Thanks for writing this! Many of the ideas, formula, and images are oddly familiar, especially the 2x2 on offline-online vs. retrieval ranking (which is an original diagram.)
It would have been nice to attribute it to the original author here: https://eugeneyan.com/writing/system-design-for-discovery/
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I build machine learning systems at a bookstore & write at https://eugeneyan.com. Applied science @ Amazon. Prev Lazada, Alibaba, IBM. twitter.com/eugeneyan
