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Download An Introduction to Natural Language Processing Through by Clive Matthews PDF

By Clive Matthews

Introduces the topic throughout the dialogue & improvement of assorted laptop courses which illustrate a number of the uncomplicated techniques & innovations within the box. The programming language used is Prolog. Paper.

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Extra resources for An Introduction to Natural Language Processing Through Prolog

Sample text

These are both examples of a Prolog fact. A fact asserts or declares that certain objects are related to one another in a particular way. A fact consists of t w o parts. First comes the name of the rela­ tion. This is called the predicate. T h e n , inside round brackets, come the names of the objects involved in the relationship, each separated by a c o m m a . These names are called a r g u m e n t s . In the examples above, s p e a k s and s p o k e n _ i n are predicates and b o r i s , r u s s i a n , e n g l i s h and u k arguments.

Ru). Facts 37 speaks(boris, russian). speaks(hank, english). speaks(John, english). speaks(Jacques, french). speaks(helmut, german). A program can be thought of as a description of a particular world of objects. H o w complete that description is depends upon the re­ quirements of the p r o g r a m . 1 Expand the previous program by adding the data that German is spoken in Austria and Switzerland, French in Canada, Belgium and Switzerland and Spanish in Spain and the Canary Islands. 2 How might the information that Bess Spooner and Ben Spooner speak English be represented in Prolog?

4 Q u e s t i o n s w i t h V a r i a b l e s The questions so far have simply asked for confirmation of some n u m b e r of goals. This can be fairly limiting. Imagine, for instance, trying to find out which languages are spoken in Peru if you did not already suspect which they might be. In such a situation, you would have to ask various yes-no questions, changing the name of the language argument each time. - spoken_in(english, p e r u ) . - spoken_in(german, p e r u ) . - spoken_in(Spanish, p e r u ) .

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