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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 icebraining on Thursday July 06, 2017 @02:58AM (#14708634)
It's weird, though; seems like an "average time between purchases" associated with each category would be an obvious metric to use in the algo.
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Re:Two Decades of Recommender Systems at Amazon.com by TeMPOraL on Thursday July 06, 2017 @05:31AM (#14709116)
A small problem might be that they're probably trying to optimize that metric, i.e. reduce your average time between purchases in each category...
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