By Pierre M. Nugues
This publication teaches the rules of traditional language processing and covers linguistics matters. It additionally info the language-processing services concerned, together with part-of-speech tagging utilizing principles and stochastic concepts. A key function of the e-book is the author's hands-on procedure all through, with broad routines, pattern code in Prolog and Perl, and an in depth creation to Prolog. The ebook is appropriate for researchers and scholars of normal language processing and computational linguistics.
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Additional resources for An introduction to language processing with Perl and Prolog : an outline of theories, implementation, and application with special consideration of English, French, and German
But it would not match the desired strings; it would ﬁnd occurrences of either C, computer S, or science because of the operator precedence. We need parentheses to group the alternations (C|c)omputer (S|s)cience and thus match the four intended strings. The order of precedence of the three main operators union, concatenation, and closure is as follows: 1. closure and other repetition operator (highest) 2. concatenation, line and word boundaries 3. union (lowest) This entails that abc* describes the set ab, abc, abcc, abccc, etc.
The automaton consists then of a core accepting the searched string and of loops to process the remaining pieces. Consider again the automaton in Fig. , in a text. We add two loops: one in the beginning and the other to come back and start the search again (Fig. 4). b Σ c a q0 q1 q2 ε Fig. 4. Searching strings ac, abc, abbc, abbbc, etc. In doing this, we have built an NFSA that it is preferable to convert into a DFSA. Hopcroft et al. (2001) describe the mathematical properties of such automata and an algorithm to automatically build an automaton for a given set of patterns to search.
11 Further Reading 19 The user’s orders to select music often contain names: artists, titles of songs, or titles of albums. The Names module extracts them from the text before they are passed on to further analysis. Names uses a pattern matcher that attempts to substitute all the names and titles contained in the input sentence with placeholders. The utterance Play before you accuse me by Clapton is transformed into Play track1 by artist1. The NLP module parses the input in which names have been substituted.
An introduction to language processing with Perl and Prolog : an outline of theories, implementation, and application with special consideration of English, French, and German by Pierre M. Nugues