LanczosSolver and DistributedLanczosSolver always assume rectangular input, but
should also handle symmetric eigensystems.
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Key: MAHOUT-310
URL: https://issues.apache.org/jira/browse/MAHOUT-310
Project: Mahout
Issue Type: Improvement
Affects Versions: 0.3
Reporter: Jake Mannix
Assignee: Jake Mannix
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).
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