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Learning local languages and their application to DNA sequence analysis

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2 Author(s)
Yokomori, T. ; Dept. of Math., Waseda Univ., Tokyo, Japan ; Kobayashi, S.

This paper presents an efficient algorithm for learning in the limit a special type of regular languages, called strictly locally testable languages from positive data, and its application to identifying the protein α-chain region in amino acid sequences. First, we present a linear time algorithm that, given a strictly locally testable language, learns its deterministic finite state automaton in the limit from only positive data. This provides one with a practical and efficient method for learning a specific concept domain of sequence analysis. We then describe several experimental results using the learning algorithm developed above. Following a theoretical observation which strongly suggests that a certain type of amino acid sequences can be expressed by a locally testable language, we apply the learning algorithm to identifying the protein α-chain region in amino acid sequences for hemoglobin. Experimental scores show an overall success rate of 95% correct identification for positive data, and 96% for negative data

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Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:20 ,  Issue: 10 )