Read e-book online An Introduction to Language Processing with Perl and Prolog: PDF

By Pierre M. Nugues

The components of traditional language processing and computational linguistics have persevered to develop in recent times, pushed via the call for to immediately approach textual content and spoken facts. With the processing energy and strategies now on hand, examine is scaling up from lab prototypes to real-world, confirmed applications.This ebook teaches the rules of normal language processing, first masking linguistics concerns resembling encoding, entropy, and annotation schemes; defining phrases, tokens and components of speech; and morphology. It then information the language-processing features concerned, together with part-of-speech tagging utilizing principles and stochastic strategies; utilizing Prolog to jot down phase-structure grammars; parsing thoughts and syntactic formalisms; semantics, predicate good judgment and lexical semantics; and research of discourse, and functions in conversation platforms. the major function of the publication is the author's hands-on method all through, with large workouts, pattern code in Prolog and Perl, and an in depth creation to Prolog. The reader is supported with a better half site that includes instructing slides, courses, and extra material.The publication is acceptable for researchers and scholars of traditional language processing and computational linguistics.

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Extra 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

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Metachars Descriptions Matches any number of occurrences * of the previous character – zero or more ? Matches at most one occurrence of the previous characters – zero or one + Matches one or more occurrences of the previous characters {n} Matches exactly n occurrences of the previous characters {n,} Matches n or more occurrences of the previous characters Matches from n to m occurrences of the previous characters Matches one occurrence of any characters of the alphabet except the new line character Matches any string of characters and until it encounters a new line character {n,m} .

For syntactic and semantic layers, a broad classification occurs between lexical and structural ambiguity. Lexical ambiguity refers to multiple senses of words, while structural ambiguity describes a parsing alternative, as with the frequently quoted sentence I saw the boy with a telescope, which can mean either that I used a telescope to see the boy or that I saw the boy who had a telescope. A way to resolve ambiguity is to use a conjunction of language processing components and techniques. In the example given by McMahon and Smith, five out of 16 1 An Overview of Language Processing eight possible interpretations are not grammatical.

The star symbol is also called the closure operator or the Kleene star. ”, we need to indicate it to the regex engine using a backslash \ before it. We saw that abc? matches ab and abc. The expression abc\? matches the string abc?. In the same vein, abc\. , and a\*bc matches a*bc. The backslash is also called the escape character. It transforms a metacharacter into a literal symbol. , (, ), [, ], {, }, *, +, |, ˆ, $, and \ to search them literally. 9. Repetition metacharacters. Metachars Descriptions Matches any number of occurrences * of the previous character – zero or more ?

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