Contents

Calibrating a NetLogo model using Genetic Algorithms

This example presents how to explore a NetLogo model step by step with an Evolutionary/Genetic Algorithm (EA/GA) in OpenMOLE.


For more generic details regarding the exploitation of Genetic Algorithms using OpenMOLE, you can check the GA section of the methods documentation

The ant model


We demonstrate this tutorial using the ants foraging model present in the Netlogo library. This model was created by Ury Wilensky. According to NetLogo's website, this model is described as:
In this project, a colony of ants forages for food. Though each ant follows a set of simple rules, the colony as a whole acts in a sophisticated way. When an ant finds a piece of food, it carries the food back to the nest, dropping a chemical as it moves. When other ants “sniff” the chemical, they follow the chemical toward the food. As more ants carry food to the nest, they reinforce the chemical trail.

A visual representation of this model looks like that:

In this tutorial we use a headless version of the model. This modified version is available here.

An optimisation problem


This model manipulates three parameters:
  • Population: number of Ants in the model,
  • Evaporation-rate: controls the evaporation rate of the chemical,
  • Diffusion-rate: controls the diffusion rate of the chemical.

Ants forage from three sources of food (see the number in the picture below). Each source