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A comment on Two Decades of Recommender Systems at Amazon.com. Parent comment

Re:Two Decades of Recommender Systems at Amazon.com by baddox on Wednesday July 05, 2017 @07:14PM (#14706926)
Why would this be an "exception"? The basic item-based collaborative filtering described at the beginning of the article finds items that are likely to be purchased by someone who has purchased a specific item.

I'm pretty sure that it's true that someone who buys a vacuum is much more likely to buy another vacuum. It may seem counterintuitive, and may not be true for you after you just bought a vacuum, but I see no reason to believe that Amazon's algorithm isn't working properly and giving Amazon a lot of value.

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Re:Two Decades of Recommender Systems at Amazon.com by blacksmith_tb on Wednesday July 05, 2017 @07:29PM (#14707024)
It seems like we're all saying the same things - I agree it is likely that someone who has bought a vacuum before is more likely to buy another. But to make the recommendations really shine, it should wait n months before suggesting that again, where n will vary quite a lot by product type - those are the sort of exceptions I'm talking about.
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