* It could be very expensive to retrieve similar products in real-time or to pre-compute all of them
* It could be very expensive to retrieve similar products in real-time or to pre-compute all of them
* Does not work for category search of freely typed search queries
* Does not work for category search of freely typed search queries
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==== Match a given set of products ====
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Given the barcodes of multiple products, return the corresponding products.
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This is to be used to make in-store personalized recommendations: the user scans all possible product choices he/she is contemplating (e.g. 5 different breakfast cereals), and we return the corresponding products, which can then be filtered/ranked according to the user preferences.