Refactor TopItems to use Lucene's PriorityQueue and remove excessive sorting
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Key: MAHOUT-881
URL: https://issues.apache.org/jira/browse/MAHOUT-881
Project: Mahout
Issue Type: Improvement
Affects Versions: 0.6
Reporter: Grant Ingersoll
Assignee: Grant Ingersoll
Priority: Minor
TopItems.getTop*() all do a fair number of excessive operations that can be
replaced by switching to using Lucene's PriorityQueue implementation, which is
more efficient and faster than Java's built in PQ implementation.
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