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[MAHOUT-412] file-backed ItemSimilarity - Mahout - [issue]
...a "FileItemSimilarity" making it possible to read (and reload) precomputed item-item-similarities from a textfile, similar to what is already possible for preferences with a FileDataModel...
http://issues.apache.org/jira/browse/MAHOUT-412    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-418] Computing the pairwise similarities of the rows of a matrix - Mahout - [issue]
...In response to the wish from MAHOUT-362 and the latest discussion on the mailing list started by Kris Jack about computing a document similarity matrix, I tried to generalize the approach we...
http://issues.apache.org/jira/browse/MAHOUT-418    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-420] Improving the distributed item-based recommender - Mahout - [issue]
...A summary of the discussion on the mailing list:Extend the distributed item-based recommender from using only simple cooccurrence counts to using the standard computations of an item-based r...
http://issues.apache.org/jira/browse/MAHOUT-420    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-438] Wrong javadoc at org.apache.mahout.common.AbstractJob.addInputOption() - Mahout - [issue]
...org.apache.mahout.common.AbstractJob.addInputOption() has a wrong javadoc comment that seems to have been copied from addOutputOption()...
http://issues.apache.org/jira/browse/MAHOUT-438    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-439] Misleading input description of ItemSimilarityJob and RecommenderJob - Mahout - [issue]
...ItemSimilarityJob and RecommenderJob both use addInputOption() from AbstractJob. The command line description for this option states that a SequenceFile of VectorWritable is expected, which ...
http://issues.apache.org/jira/browse/MAHOUT-439    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-440] Convenient usage of RowSimilarityJob and ItemSimilarityJob - Mahout - [issue]
...I have added those two jobs to the MahoutDriver and made them accept shortcut names for the currently existing similarity implementations, so that users do not have to supply the full classn...
http://issues.apache.org/jira/browse/MAHOUT-440    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-441] File-backed IDMigrator - Mahout - [issue]
...To complete taste's suite of file-related implementations (currently FileDataModel and FileItemSimilarity) I created an IDMigrator backed by a file. It can be refreshed and will reload it's ...
http://issues.apache.org/jira/browse/MAHOUT-441    Author: Sebastian Schelter , 2010-10-31, 15:49
[MAHOUT-1578] Optimizations in matrix serialization - Mahout - [issue]
...MatrixWritable contains inefficient code in a few places: type and size are stored with every vector, although they are the same for every vector in some places vectors are added to the matr...
http://issues.apache.org/jira/browse/MAHOUT-1578    Author: Sebastian Schelter , 2015-04-13, 09:57
[MAHOUT-1580] Optimize getNumNonZeroElements - Mahout - [issue]
...getNumNonZeroElements in AbstractVector uses the nonZeroes -iterator internally which adds a lot of overhead for certain types of vectors, e.g. the dense ones. We should add custom implement...
http://issues.apache.org/jira/browse/MAHOUT-1580    Author: Sebastian Schelter , 2015-04-13, 10:21
[MAHOUT-1394] Undeprecate Lanczos - Mahout - [issue]
http://issues.apache.org/jira/browse/MAHOUT-1394    Author: Sebastian Schelter , 2014-02-03, 07:57