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Re: Multi-file Matrices? - Mahout - [mail # user]
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...The ordering *can* be chosen to be that. But nothing in our api documentation implies we will always do this, and in fact it completely depends on whether the MR job used to create the...
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Author: Jake Mannix,
2011-11-14, 08:06
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Re: Multi-file Matrices? - Mahout - [mail # user]
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...I don't think we currently make any guarantees about sort-order of the parts themselves, or among the various part-files, as the may be created by any number of map-reduce jobs, and are then...
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Author: Jake Mannix,
2011-11-14, 06:56
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Re: lsi - Mahout - [mail # user]
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...On Sun, Nov 13, 2011 at 10:31 PM, Ted Dunning wrote: Yeah, I guess I tend to make the assumption that everyone is all in memory like I've been the past 4 years or so. I hav...
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Author: Jake Mannix,
2011-11-14, 06:40
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Re: Multi-file Matrices? - Mahout - [mail # user]
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...Yeah, in particular, DistributedRowMatrix "is" simply a SequenceFile, when in its serialized form. As such, this "file" can be (and typically is) a series of part-* files in a director...
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Author: Jake Mannix,
2011-11-14, 06:34
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Re: lsi - Mahout - [mail # user]
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...On Sun, Nov 13, 2011 at 10:09 PM, Ted Dunning wrote: It's not just projection, it's for added relevance: if you are already doing Lucene for your scoring needs, you already are ...
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Author: Jake Mannix,
2011-11-14, 06:18
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Re: lsi - Mahout - [mail # user]
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...Store the vectors as binary payloads and keep the projection matrix in memory with the qureryBuilder, to add an "lsi cosine" between query and doc scoring feature? On Nov 13, 2011 12:5...
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Author: Jake Mannix,
2011-11-13, 23:56
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Re: Mahout and multi-label classification - Mahout - [mail # user]
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...On Tue, Nov 8, 2011 at 4:35 AM, Ted Dunning wrote: Only? You mean the only method we have currently implemented, right? Labeled LDA (PDF) is a good example of ...
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Author: Jake Mannix,
2011-11-08, 18:07
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Re: Comparing results of Mahout SVD and Scilab - Mahout - [mail # user]
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...The output from the LanczosSolver is not the final set of results. The fact that you passed --cleansvd "true" to the system means that you want it to do some cleanup and remove any spu...
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Author: Jake Mannix,
2011-11-08, 18:04
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Re: Understanding the SVD recommender - Mahout - [mail # user]
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...The idea is this: after k iterations, you have a k-by-k tri-diagonal matrix, the eigenvalues of *this* are *an approximation* to the top k eigenvalues of A*A'. The largest of these k w...
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Author: Jake Mannix,
2011-11-07, 00:19
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Re: Understanding the SVD recommender - Mahout - [mail # user]
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...Re: Lanczos, yes, it operates by finding V as you describe. The user is required to do more work to recapture U. Practical reason is that the assumption is numCols(A) = numFeatur...
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Author: Jake Mannix,
2011-11-06, 18:08
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