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Can user id and item id be negative integers?

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Hi,

Is it OK that we use negative ids?

I have the impression that user id and item id should be natural integers like 0, 1, 2, because they are used as column number and row numbers.

But today I am trying to use negative user id and item id, and they are working well with the item recommender and dvd recommender.

Many thanks,
Peng Zhang
pzhang.xjtu [ at ] gmail.com

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