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Re: Mahout Clustering - integration with HBase - Mahout - [mail # user]
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.... That will be affected positively by including more regions in the scan and negatively by having lower density of interesting rows in the regions being scanned. If you could cluster all collections in the same...
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Author: Ted Dunning,
2011-03-11, 18:16
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Re: Feedback on provided recommendations - Mahout - [mail # user]
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...Exactly. In informal experiments I have tested these two systems: a) consider all ratings as positive (whether like or dislike), run boolean recommendations and then filter out explicit...
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... matches to negative ratings b) run boolean recommendations on positive and negative separately and output a score that is a linear combination of the two System (a) was much better than system...
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Author: Ted Dunning,
2010-04-28, 19:19
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Re: Design Question - Mahout - [mail # user]
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... for the same hour one week ago and one day ago. Then, I could build a Poisson process alert based simply on inter-arrival time and desired false positive rate. Normally I set the false positive rate...
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Author: Ted Dunning,
2010-10-31, 20:30
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Re: Algorithm implementations in Pig - Mahout - [mail # dev]
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...I have had both positive and negative results with PIG. The positive results were that I was able to express large recommendation computations in a very concise way. That was really...
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Author: Ted Dunning,
2010-02-22, 07:56
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Re: weighted score - Mahout - [mail # user]
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...On Tue, Feb 23, 2010 at 4:16 PM, Tamas Jambor wrote: Did you mean to ask "HOW would I express this"? For many applications where averages seem usable with positive weights, I would use...
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... squared distance from positive examples and negative squared distance from negative examples. 3 is incorrect, actually. The fact that the sum of the weights does, indeed, indicate...
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| ... constraints is to pick 5. This is better than 3 because it is both farther from the negatively weighted 1 rating and closer to positively rated 5 rating. Because of the peculiarity of squared error... |
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Author: Ted Dunning,
2010-02-24, 00:28
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Re: Twitter Classification - Mahout - [mail # user]
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... of clusters b) label each cluster according to a CL-derived category c) mark positive and negative examples in the cluster according to labels applied in (b) d) train on labeled examples, possibly...
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Author: Ted Dunning,
2010-01-21, 21:05
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Re: adding feature:skip user's non-interested items when generate recommendation for user. - Mahout - [mail # user]
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... impart information about positive preferences in addition to some level of negative information. I used an explicit filter at both Musicmatch and at Veoh. Both systems worked well. Especially...
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Author: Ted Dunning,
2010-08-24, 04:07
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Re: Design Question - Mahout - [mail # user]
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... when the inter-transaction time exceeded a reasonable bound. For a specified false positive rate, this was very easily done and results were very nearly optimal. More importantly, the alerts...
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Author: Ted Dunning,
2010-10-20, 23:06
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[NOMINATION] Mahout PMC Chair - Mahout - [mail # dev]
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... by the Mahout committers to conclude Saturday March 20 at noon PDT. Since this is a procedural vote, a majority vote of committers will suffice for election and only positive votes for a properly...
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Author: Ted Dunning,
2010-03-15, 19:06
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Re: Modelling typed vectors? - Mahout - [mail # user]
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... the imposition of this constraint as an error and have had much better results starting with normally distributed values. My argument is that quasi-orthogonality does not hold with uniform positive...
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Author: Ted Dunning,
2010-10-14, 14:31
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