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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...I understand the idea, but this boils down to the current implementation, plus going back and throwing out some additional training data that is lower rated -- it's neither in test or traini...
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Author: Sean Owen,
2013-02-16, 21:34
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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...If you're suggesting that you hold out only high-rated items, and then sample them, then that's what is done already in the code, except without the sampling. The sampling doesn't buy anythi...
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Author: Sean Owen,
2013-02-16, 21:19
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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...Sure, if you were predicting ratings for one movie given a set of ratings for that movie and the ratings for many other movies. That isn't what the recommender problem is. Here, the problem ...
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Author: Sean Owen,
2013-02-16, 20:32
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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...This is a good answer for evaluation of supervised ML, but, this is unsupervised. Choosing randomly is choosing the 'right answers' randomly, and that's plainly problematic. On Sat, F...
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Author: Sean Owen,
2013-02-16, 20:15
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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...Yes. But: the test sample is small. Using 40% of your data to test is probably quite too much. My point is that it may be the least-bad thing to do. What test are you proposing instead...
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Author: Sean Owen,
2013-02-16, 19:37
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Re: Problems with Mahout's RecommenderIRStatsEvaluator - Mahout - [mail # user]
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...No, this is not a problem. Yes it builds a model for each user, which takes a long time. It's accurate, but time-consuming. It's meant for small data. You could rewrite your own test t...
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Author: Sean Owen,
2013-02-16, 18:41
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Re: Shopping cart - Mahout - [mail # user]
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...Yes your only issue there, which I think you had touched on, was that you have to put your current cart (which hasn't been purchased) into the model in order to get an answer out of a recomm...
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Author: Sean Owen,
2013-02-14, 19:44
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Re: Shopping cart - Mahout - [mail # user]
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...I don't think it's necessarily slow; this is how item-based recommenders work. The only thing stopping you from using Mahout directly is that I don't think there's an easy way to say "recomm...
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Author: Sean Owen,
2013-02-14, 18:57
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Re: Shopping cart - Mahout - [mail # user]
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...This sounds like a job for frequent item set mining, which is kind of a special case of the ideas you've mentioned here. Given N items in a cart, which next item most frequently occurs in a ...
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Author: Sean Owen,
2013-02-14, 17:45
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Re: Improving quality of item similarities? - Mahout - [mail # user]
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...Yes, I don't know if removing that data would improve results. It might mean you can compute things faster, at little or no observable loss in quality of the results. I'm not sure, but...
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Author: Sean Owen,
2013-02-14, 10:17
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