Efficient Segmental Cascades for Speech Recognition

Hao Tang, Weiran Wang, Kevin Gimpel, Karen Livescu

Discriminative segmental models offer a way to incorporate flexible feature functions into speech recognition. However, their appeal has been limited by their computational requirements, due to the large number of possible segments to consider. Multi-pass cascades of segmental models introduce features of increasing complexity in different passes, where in each pass a segmental model rescores lattices produced by a previous (simpler) segmental model. In this paper, we explore several ways of making segmental cascades efficient and practical: reducing the feature set in the first pass, frame subsampling, and various pruning approaches. In experiments on phonetic recognition, we find that with a combination of such techniques, it is possible to maintain competitive performance while greatly reducing decoding, pruning, and training time.

DOI: 10.21437/Interspeech.2016-1298

Cite as

Tang, H., Wang, W., Gimpel, K., Livescu, K. (2016) Efficient Segmental Cascades for Speech Recognition. Proc. Interspeech 2016, 1903-1907.

author={Hao Tang and Weiran Wang and Kevin Gimpel and Karen Livescu},
title={Efficient Segmental Cascades for Speech Recognition},
booktitle={Interspeech 2016},