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Re: Which database should I use with Mahout - Mahout - [mail # user]
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...(I had in mind non distributed parts of Mahout but the principle is similar, yes.) On May 19, 2013 6:27 PM, "Pat Ferrel" wrote: ...
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Author: Sean Owen,
2013-05-20, 01:34
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Re: Which database should I use with Mahout - Mahout - [mail # user]
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...(Oh, by the way, I realize the original question was about Hadoop. I can't read carefully.) No, HDFS is not good for anything like random access. For input, that's OK, because you don'...
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Author: Sean Owen,
2013-05-19, 18:44
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Re: Which database should I use with Mahout - Mahout - [mail # user]
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...I think everyone is agreeing that it is essential to only access information in memory at run-time, yes, whatever that info may be. I don't think the original question was about Hadoop, but,...
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Author: Sean Owen,
2013-05-19, 18:26
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Re: Which database should I use with Mahout - Mahout - [mail # user]
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...I'm first saying that you really don't want to use the database as a data model directly. It is far too slow. Instead you want to use a data model implementation that reads all of the data, ...
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Author: Sean Owen,
2013-05-19, 17:20
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Re: Which database should I use with Mahout - Mahout - [mail # user]
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...It doesn't matter, in the sense that it is never going to be fast enough for real-time at any reasonable scale if actually run off a database directly. One operation results in thousands of ...
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Author: Sean Owen,
2013-05-19, 17:00
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Re: How to extend FileDataModel - Mahout - [mail # user]
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...Why not? it's just the object reference that is local to the function. The Map itself is not, and on the heap like everything else in the JVM. On Thu, May 16, 2013 at 2:19 AM, huangjia...
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Author: Sean Owen,
2013-05-16, 06:52
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Re: How to execute RecommenderJob without preference value - Mahout - [mail # user]
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...You can't have a blank line, if that's what you mean, yes. That's not a valid record. A terminal newline is fine. But the error seems to be something else: java.io.FileNotFoundExceptio...
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Author: Sean Owen,
2013-05-11, 09:43
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Re: ALSWR MovieLens 100k - Mahout - [mail # user]
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...Yes, you overfit the training data set, so you "under-fit" the test set. I'm trying to suggest why more degrees of freedom (features) makes for a "worse" fit. It doesn't, on the training set...
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Author: Sean Owen,
2013-05-09, 15:09
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Re: ALSWR MovieLens 100k - Mahout - [mail # user]
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...OK I keep thinking ALS-WR = weighted terms / implicit feedback but that's not the case here it seems. Well scratch that part, but I think the answer is still overfitting. On Thu, May 9...
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Author: Sean Owen,
2013-05-09, 13:49
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Re: ALSWR MovieLens 100k - Mahout - [mail # user]
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...RMSE would have the same potential issue. ALS-WR is going to prefer to minimize one error at the expense of letting another get much larger, whereas RMSE penalizes them all the same. I...
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Author: Sean Owen,
2013-05-09, 13:33
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