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  1. Mahout
  2. MAHOUT-310

LanczosSolver and DistributedLanczosSolver always assume rectangular input, but should also handle symmetric eigensystems.

    Details

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

      Description

      LanczosSolver calls inputMatrix.timesSquared(Vector) as it's Krylov iteration, but for symmetric inputMatrix, it should chose to instead call inputMatrix.times(Vector).

      Similarly for DistributedLanczosSolver, except in this case, DistributedSparseRowMatrix actually needs to properly MapReduce implement times(Vector) for this to work (which it should do anyways, instead of throw UnsupportedOperationException as it does currently).

        Attachments

        1. MAHOUT-lots.diff
          56 kB
          Jake Mannix
        2. MAHOUT-310.patch
          21 kB
          Jake Mannix

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            People

            • Assignee:
              jake.mannix Jake Mannix
              Reporter:
              jake.mannix Jake Mannix
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              Dates

              • Created:
                Updated:
                Resolved: