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

By Clive Matthews

Introduces the topic during the dialogue & improvement of assorted computing device courses which illustrate a number of the uncomplicated strategies & ideas 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

Example text

Consider another predicate which can be defined on the basis of the present set of predicates. Assume that w o r l d _ l a n g u a g e ( L a n g ) holds of any language, L a n g , just in case it is spoken in more than one country. T h e obvious way to define this might seem to be with the following rule. world_language(Lang) :spoken_in(Lang, spoken_in(Lang, Country1), Country2). The idea here would be that using t w o different variable names for the country arguments ensures that t w o different countries are being referred t o .

It is possible to use this to refer to a particular argument position. For example, rather than saying 'the first argument position' for the predicate s p o k e n _ i n it might be referred to as the 'language position'. A set of facts with the same predicate symbol and same n u m b e r of arguments defines the relation for which the predicate stands. Such a collection of facts is called a p r o c e d u r e . Below is a proced­ ure for the predicate s p o k e n _ i n . spoken_in(english, spoken_in(english, spoken_in(english, spoken_in(Spanish, spoken_in(quechua, spoken_in(piro, pe uk) .

For example, the following t w d facts involve different predicates because of the different n u m b e r of arguments taken. language(english). language(english, indo_european). e. English is an Indo-European language It is important that a fact's arguments appear as an ordered se­ quence since relations are often ordered. For instance, English is spoken in the United K i n g d o m but the United K i n g d o m is not spoken in English. It is arbitrary which ordering of arguments is chosen. All that matters is that, once a choice has been made, it is adhered to t h r o u g h o u t the p r o g r a m .

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