Prolog

Automatically Converting Active Voice to Passive Voice and Vice Versa

Written by on February 16, 2020 in Natural Language Processing, Programming, Prolog with 0 Comments
Automatically Converting Active Voice to Passive Voice and Vice Versa

The iLexicon system can handle active/passive voice conversion of fairly complex English sentences. I gave examples of the underlying verb conjugation mechanism in this article and this one. Today, I am going to give examples of the conversion of complete sentences. Here is an example of active to passive voice conversion: The above is a snapshot […]

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Verb Conjugations in Passive Voice

Written by on February 2, 2020 in Natural Language Processing, Prolog with 0 Comments
Verb Conjugations in Passive Voice

In my earlier article, I showed how the iLexicon system can generate verb conjugations based on <Verb, Tense, Person, Number> quadruple. For the 16 tense forms discussed in that article, the verb conjugations were generated in “active” voice.  We all know that “transitive” verbs can be expressed in both “active” and “passive” voice. For example, […]

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Distributed Computing with Linda

Written by on December 22, 2019 in Programming, Prolog with 0 Comments
Distributed Computing with Linda

Linda, originally proposed by Nicholas Carriero and David Gelernter, is a model of process communication using a small set of well-defined primitives, operating on a tuple space.  Interestingly, Sicstus Prolog comes with a library that implements Linda (both Server and Client).  I played with it a little bit and really enjoyed it. In this article, I would […]

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Using Definite Clause Grammars (DCG) for Information Extraction

Written by on December 8, 2019 in Natural Language Processing, Programming, Prolog with 0 Comments
Using Definite Clause Grammars (DCG) for Information Extraction

In the previous article, I showed how we can use ATNs for extracting key information from natural language text. I also pointed out in that article that Definite Clause Grammars (DCG) are a more compact formalism for doing this. That will be the focus of today’s article. For a nice introduction to DCG, read this. […]

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Calling C# Methods from Sicstus Prolog through COM Interface

Written by on November 10, 2019 in Programming, Prolog with 0 Comments
Calling C# Methods from Sicstus Prolog through COM Interface

Recently I needed to make use of a C# library (which I had implemented a few years ago) from Sicstus Prolog. Calling C/C++ functions from Sicstus Prolog is fairly well documented. When it comes to C#/.NET, the official documentation recommends the PrologBeans library. After going through the documentation, I felt that it would not work for […]

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Conjugating Phrasal Verbs

Written by on October 13, 2019 in Natural Language Processing, Programming, Prolog with 0 Comments
Conjugating Phrasal Verbs

In the last article, I showed how to generate verb conjugations in the “iLexicon” system. Today, let us see how this idea can be extended to English “phrasal verbs”. According to Wikipedia: “a phrasal verb is a phrase such as turn down or ran into which combines two or three words from different grammatical categories: […]

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Generating Verb Conjugations

Written by on September 29, 2019 in Natural Language Processing, Programming, Prolog with 0 Comments
Generating Verb Conjugations

We have been taught in school that English language has different “tense” forms. To help you quickly recollect, I am listing them in the table below (the verb ‘sleep’ is used as example): No. Tense Form Example Sentence (3rd Person Singular Pronoun) 1 Simple Present She sleeps 2 Simple Past She slept 3 Simple Future […]

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Exploring Word Patterns

Written by on September 15, 2019 in Natural Language Processing, Programming, Prolog with 0 Comments
Exploring Word Patterns

Working with word patterns can be an exciting (and challenging) creative activity. Such patterns come into picture while playing word games, solving word puzzles or even writing poetry. It is precisely to facilitate such tasks that I am building my “iLexicon” system.  One popular word game goes like this: The first player utters a word, […]

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Poetry in Prolog: Part-2

Written by on September 1, 2019 in Natural Language Processing, Programming, Prolog with 0 Comments
Poetry in Prolog: Part-2

In an earlier post, I showed how Prolog can be used to generate poetry, making use of my “iLexicon”. I want to continue the discussion today by giving another example, this time based on the theme of sounds emitted by various animals and birds. As hinted in my previous articles, “iLexicon” stands for “Intelligent Lexicon”. […]

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Using Berkeley DB with Sicstus Prolog

Written by on August 18, 2019 in Programming, Prolog with 0 Comments
Using Berkeley DB with Sicstus Prolog

One of the nice features of Sicstus Prolog is the support for storing Terms externally in a Berkeley DB database. Since we can control how the terms are indexed in the database, it is possible to store and retrieve a large amount of Terms (the limit is 2^32-1) fairly efficiently. This can be useful when we work in a […]

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