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  1. Mahout
  2. MAHOUT-314

DistributedRowMatrix needs a sparse DistributedRowMatrix times(DistributedRowMatrix other) implementation

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    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.3
    • Fix Version/s: 0.3
    • Component/s: None
    • Labels:
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      Description

      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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            • Assignee:
              jake.mannix Jake Mannix
              Reporter:
              jake.mannix Jake Mannix
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              • Created:
                Updated:
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