Mahout
  1. Mahout
  2. MAHOUT-310

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

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major 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).

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

        Activity

        No work has yet been logged on this issue.

          People

          • Assignee:
            Jake Mannix
            Reporter:
            Jake Mannix
          • Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development