DistributedRowMatrix needs a sparse DistributedRowMatrix
times(DistributedRowMatrix other) implementation
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Key: MAHOUT-314
URL: https://issues.apache.org/jira/browse/MAHOUT-314
Project: Mahout
Issue Type: New Feature
Affects Versions: 0.3
Reporter: Jake Mannix
Assignee: Jake Mannix
If the matrix which is being multiplied by has been transformed into a
column-sparse matrix backed by a SequenceFile<IntWritable,VectorWritable>, then
doing a simple map-side join on the two, and taking the (sparse) outer product
of each row-pair, and then doing a matrix-summing reducer (probably
row-at-a-time, for memory constraints) would implement sparse matrix
multiplication in one pass over the data.
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