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Re: Vectors with 64bit indices? - Mahout - [mail # dev]
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...I use 64-bit keys for vector-like data structures, and indeed you may pay a cost in extra RAM, but it has a lot of benefits in simplicity mostly, and making the probability of hash collision...
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Author: Sean Owen,
2013-06-19, 17:25
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Re: Does RowSimilarity job support down-sampling - Mahout - [mail # dev]
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...No, it's in ItemSimilarityJob -- I'm looking at it now. It ends up setting ToItemVectorsMapper.SAMPLE_SIZE, if that helps. On Tue, Jun 18, 2013 at 9:43 PM, Ted Dunning wrote:...
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Author: Sean Owen,
2013-06-18, 20:47
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Re: Does RowSimilarity job support down-sampling - Mahout - [mail # dev]
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...This is the "maxPrefsPerUser" option IIRC. On Tue, Jun 18, 2013 at 9:27 PM, Ted Dunning wrote:...
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Author: Sean Owen,
2013-06-18, 20:34
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Re: Negative Preferences in a Recommender - Mahout - [mail # user]
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...I'm suggesting using numbers like -1 for thumbs-down ratings, and then using these as a positive weight towards 0, just like positive values are used as positive weighting towards 1. M...
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Author: Sean Owen,
2013-06-18, 15:35
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Re: Negative Preferences in a Recommender - Mahout - [mail # user]
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...Yes the model has no room for literally negative input. I think that conceptually people do want negative input, and in this model, negative numbers really are the natural thing to express t...
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Author: Sean Owen,
2013-06-18, 07:13
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Re: Mahout compatibility with Hadoop - Mahout - [mail # user]
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...Yes you have to refer to the 'mrv1' artifacts if I recall correctly, if you use CDH4. You are talking about CDH3, which is different. On Mon, Jun 17, 2013 at 3:23 PM, wrote:...
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Author: Sean Owen,
2013-06-17, 14:28
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Re: Mahout compatibility with Hadoop - Mahout - [mail # user]
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...CDH3 has 0.5 + patches, CDH4 has 0.7 + patches. I suppose the good news there is that recent versions must work OK with Hadoop 2.x, since CDH4 = Hadoop 2. (I didn't suspect otherwise.)...
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Author: Sean Owen,
2013-06-17, 14:03
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Re: Mahout compatibility with Hadoop - Mahout - [mail # user]
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...Is it compatible with any Hadoop release? of course, would it make sense if not? I'm not sure where you get this idea. 0.5 was, I think, compiled vs 0.20.x. The last release was vs 1.0.3 or ...
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Author: Sean Owen,
2013-06-17, 13:53
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Re: A few more deprecations - Mahout - [mail # dev]
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...I agree, they're not efficient to apply and aren't frequently applied these days. You'd more usually pick techniques that aren't sensitive to popularity effects and mean/stdev of data. ...
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Author: Sean Owen,
2013-06-13, 19:59
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Re: Running Mahout recommendations on a Cassandra data set - Mahout - [mail # user]
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...This is more of a Hadoop question. The input hides behind the InputFormat implementation. If you have an InputFormat that can read and produce the same key-value pairs that you'd get from a ...
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Author: Sean Owen,
2013-06-12, 09:48
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