Vector.getDistanceSquared() is incorrect for both SparseVector varieties
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Key: MAHOUT-268
URL: https://issues.apache.org/jira/browse/MAHOUT-268
Project: Mahout
Issue Type: Bug
Affects Versions: 0.2
Environment: all
Reporter: Jake Mannix
Fix For: 0.3
I'm pretty sure that getDistanceSquared() should just return as if an optimized
implementation of:
{code}
public double getDistanceSquared(Vector v) { return
this.minus(v).getLengthSquared(); }
{code}
In which case if some vector elements are negative, both
SequentialAccessSparseVector (my fault!) and RandomAccessSparseVector return
the wrong thing. Very easy to write a failing unit test for this one.
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