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Re: Boosting User-Based with the user's attributes - Mahout - [mail # user]
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...Of course it's not meaningless. They provide a basis for ranking items, so you can return top-K recommendations. If it's normally based on similarity and ratings -- and you have no ratings -...
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Author: Sean Owen,
2013-04-16, 14:40
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Re: Boosting User-Based with the user's attributes - Mahout - [mail # user]
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...In the usual recommender, the output is a weighted average of ratings. In a model where there are no ratings, this has no meaning -- everything is "1" implicitly. So the output is something ...
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Author: Sean Owen,
2013-04-16, 14:09
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Re: Boosting User-Based with the user's attributes - Mahout - [mail # user]
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...That shouldn't be possible, are you sure? it's 1 - 1/(1+LLR) where LLR is nonnegative. Similarities are in [-1,1] and some are in [0,1]. On Tue, Apr 16, 2013 at 2:51 PM, Agata Filiana ...
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Author: Sean Owen,
2013-04-16, 13:58
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Re: Boosting User-Based with the user's attributes - Mahout - [mail # user]
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...Broadly the idea makes sense, but I think this is getting into hacking heuristics together without a lot of principle. The result will probably work, and you can just proceed as you say -- m...
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Author: Sean Owen,
2013-04-16, 10:30
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Re: Odd vector iteration behavior - Mahout - [mail # dev]
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...The JVM can only do this sort of thing if the object doesn't escape scope -- totally local. This wouldn't be possible here. On Mon, Apr 15, 2013 at 12:55 AM, Ted Dunning wrote:...
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Author: Sean Owen,
2013-04-15, 00:01
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Re: Odd vector iteration behavior - Mahout - [mail # dev]
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...Yeah you have to have a clone() or copy constructor or something. Add that? that solves the other problem. At least, that's the intent and it is an option. If you need the value to be ...
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Author: Sean Owen,
2013-04-12, 19:37
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Re: Odd vector iteration behavior - Mahout - [mail # dev]
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...I'm sure I did (at least much of) the AbstractIterator change so blame me... but I think the pattern itself is just fine. It's used in many places in the project. Reusing the value object is...
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Author: Sean Owen,
2013-04-12, 19:22
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Re: log-likelihood ratio value in item similarity calculation - Mahout - [mail # user]
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...Yes that's true, it is more usually bits. Here it's natural log / nats. Since it's unnormalized anyway another constant factor doesn't hurt and it means not having to change the base. ...
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Author: Sean Owen,
2013-04-12, 08:10
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Re: log-likelihood ratio value in item similarity calculation - Mahout - [mail # user]
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...Yes I also get (er, Mahout gets) 117 (116.69), FWIW. I think the second question concerned counts vs relative frequencies sum or not. For a fixed set of observations that does change t...
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Author: Sean Owen,
2013-04-11, 22:01
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Re: Is Mahout the right tool to recommend cross sales? - Mahout - [mail # user]
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...You can actually create a "user" #6 for your new order. Or you can use the "anonymous user" function of the library, although it's hacky. We may be mixing up terms here. "DataModel" is...
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Author: Sean Owen,
2013-04-11, 21:42
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