An efficient two-pass search algorithm using word trellis index
An efficient two-pass search algorithm using word trellis index
复制标题
一种利用词网格索引的高效两遍搜索算法
DOI:
10.21437/icslp.1998-626
复制
发表时间:
1998
期刊:
影响因子:
--
通讯作者:
S. Doshita
中科院分区:
文献类型:
--
作者:
Akinobu Lee;Tatsuya Kawahara;S. Doshita
We propose an e cient two-pass search algorithm for LVCSR. Instead of conventional word graph, the rst preliminary pass generates \word trellis index", keeping track of all survived word hypotheses within the beam every time-frame. As it represents all found word boundaries non-deterministically, we can (1) obtain accurate sentence-dependent hypotheses on the second search, and (2) avoid expensive word-pair approximation on the rst pass. The second pass performs an e cient stack decoding search, where the index is referred to as predicted word list and heuristics. Experimental results on 5,000-word Japanese dictation task show that, compared with the word-graph method, this trellis-based method runs with less than 1/10 memory cost while keeping high accuracy. Finally, by handling inter-word context dependency, we achieved the word error rate of 5.6%.
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--