Construct · 1 fields · 2 citations
One name. One construct. A landmark on the map.
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A heuristic search that explores a tree of possibilities while keeping only the best few partial solutions at each step, the number kept being the beam width. It was introduced in the Harpy speech-recognition system: Lowerre (1976) pruned the exponential space of word sequences by holding a fixed-size set of the most promising hypotheses, and Reddy (1976) reviewed it as the technique that made the search tractable. The referent is a procedure, not a physical thing, and its unit is that retained set of candidates rather than a member, a wave, or a width. What defines it is the pruning rule: widen the beam and it approaches exhaustive search, narrow it to one and it becomes greedy. It shares the word with girders and lasers, but this beam is a metaphor, the narrow band of options a program bothers to keep.[1][2]
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