By Clive Matthews

ISBN-10: 0582066220

ISBN-13: 9780582066229

Introduces the topic in the course of the dialogue & improvement of assorted desktop courses which illustrate a number of the simple recommendations & recommendations within the box. The programming language used is Prolog. Paper.

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Additional resources for An Introduction to Natural Language Processing Through Prolog

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The amended definition for w o r l d _ l a n g u a g e n o w becomes: world_language(Lang) :spoken_in(Lang, Countryl), spoken_in(Lang, Country2), not(Countryl = Country2). The third clause of the body of the rule ensures that, whatever the values are for C o u n t r y ! and C o u n t r y 2 , they must not be the same. As a result, Piro is n o longer defined as a world language but English is. 1 Define the predicate language (Language) in terms of the predicate spoken_in. 2 On the basis of a set of speaks facts, define someone as bilingual if they speak more than one language.

For this reason, names should be chosen whose interpretation is intended to approximate to the equivalent English w o r d s . It is important to n o t e that with respect to Prolog 'fact' simply refers to a particular type o f syntactic expression. T h e r e is n o re­ quirement that facts should actually be true. As long as the syntax of the expression is correct, any statement m a y be made in Prolog, even those that are false such as: speaks(boris, piro). Whenever a constant is used as an argument within a program it is, as its name suggests, taken to represent the same object.

S p o k e n _ i n ( L a n g u a g e , C o u n t r y ) > (Language,peru). spoken_in N o t e that the variable L a n g u a g e appears in both goals so that what­ ever instantiation of L a n g u a g e satisfies the first goal must also satisfy the second. Prolog begins by attempting to satisfy the first goal. It can do this by matching with the first fact of the program with the instantiations: Language = e n g l i s h C o u n t r y = uk These instantiations mean that the second goal n o w s p o k e n _ i n ( e n g l i s h , p e r u ) .

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An Introduction to Natural Language Processing Through Prolog by Clive Matthews

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