2083e88100
This change allows you to pass a list of srid36s and get back recommendations for all of them at once, which is useful for multireddit suggestions. A function that accepted a single subreddit id as an argument and memoized the results was removed and its functionality replaced by sgm caching, which sets multiple items in memcache at once. A source prefix is added to the row key so multiple sets of recs can be stored in the same column family. Adult items are filtered unless one of the original subreddits was over_18. Recommendations for a set of subreddits are merged and sorted by the number of items matched. (User feedback showed that people perceive recommendations as incorrect if they don't match the "theme" of a large multi, and recs that match several srs in the multi instead of just one are more likely to fit the theme, so we show those first.)
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