SPIRAL: efficient and exact model identification for hidden Markov models

  • Authors:
  • Yasuhiro Fujiwara;Yasushi Sakurai;Masashi Yamamuro

  • Affiliations:
  • NTT Cyber Space Laboratories, Yokosuka-Shi, Japan;NTT Communication Science Laboratories, Seika-Cho, Japan;NTT Cyber Space Laboratories, Yokosuka-Shi, Japan

  • Venue:
  • Proceedings of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining
  • Year:
  • 2008

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Abstract

Hidden Markov models (HMMs) have received considerable attention in various communities (e.g, speech recognition, neurology and bioinformatic) since many applications that use HMM have emerged. The goal of this work is to identify efficiently and correctly the model in a given dataset that yields the state sequence with the highest likelihood with respect to the query sequence. We propose SPIRAL, a fast search method for HMM datasets. To reduce the search cost, SPIRAL efficiently prunes a significant number of search candidates by applying successive approximations when estimating likelihood. We perform several experiments to verify the effectiveness of SPIRAL. The results show that SPIRAL is more than 500 times faster than the naive method.