Discussion
How does a discrimination network reduce matching cost?
Answer: B
A network such as Rete keeps the partial matches computed so far and updates them incrementally as facts are added or removed, so the work is proportional to the change rather than to the size of the base. The price is considerable memory. Rule ordering, compression and decision trees are different techniques. Trading memory for incremental rather than complete recomputation is a pattern that recurs wherever a system responds to a stream of small changes.
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