lamba92 / clingo-project

A clingo project

CLINGO PROJECT

This project has been written for the exam of Artificial Intelligence Laboratory at the University of Turin.

It consists in two exercises:

• calendar: the generation of a timetable for the Computer Science Department courses of the University of Turin.
• cargo: the cargo problem seen in Artificial Intelligence, a Modern Approach by Russell and Norvig.

Calendar

The knowledge base has been populated with many predicates, some hardcoded with the available classrooms, courses and professors. Given those, in each model the predicate slot/8 is generated, containing all the information of the time table. Then to check if the timetable is a valid one or not, few other predicates are generated and checks are made to test if the model is a valid one or not.

The folder calendar\ui contains a Kotlin JVM project that starting from a text file containing the slot/8 predicates converts them in a .csv file allowing to import it inside Excel:

Cargo

To solve this problem we used the incremental ASP solving approach, widely covered in Potassco User Guide and in the "Reasoning Web - Semantic Interoperability on the Web (2017)" book.
To use this approach is mandatory to include the #include <incmode> directive in your file.

Our code for the Cargo Planning Problem uses #program directives to define the base/0 subprogram which initializes and instantiates the prior knowledge base, the step/1 (t) subprogram which is the transition state model for each step t > 0 and the check/1 (t) subprogram which checks state constraints and state goal for each step t >= 0.

The atom query (t), provided in the incremental mode, allows to incrementally query the knowledge base at each step; his value is TRUE only for the last step t and FALSE for all the other steps.

We managed both single and multiple actions for each step and also the Frame problem resolution.

To model the problem we have been inspired by the model written in the Artificial Intelligence, a Modern Approach book by Russell and Norvig:

Authors

• Cesare Iurlaro - CesareIurlaro
• Giuseppe Gabbia - beppe95
• Lamberto Basti - lamba92