Vector.getLengthSquared() is dangerously optimized
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Key: MAHOUT-208
URL: https://issues.apache.org/jira/browse/MAHOUT-208
Project: Mahout
Issue Type: Bug
Components: Matrix
Affects Versions: 0.1
Environment: all
Reporter: Jake Mannix
Fix For: 0.3
SparseVector and DenseVector both cache the value of lengthSquared, so that
subsequent calls to it get the cached value. Great, except the cache is never
cleared - calls to set/setQuick or assign or anything, all leave the cached
value unchanged.
Mutating method calls should set lengthNorm to -1 so that the cache is cleared.
This could be a really nasty bug if hit.
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