Grokking Artificial Intelligence Algorithms MEAP V05 by Rishal Hurbans

Author:Rishal Hurbans [Rishal Hurbans]
Language: eng
Format: epub, pdf
Publisher: Manning Publications Co.
Published: 2020-04-23T22:00:00+00:00

Solution: Determine the probabilities of visiting the attractions with the following information

6.4.4 Update the pheromone trails

Now that the ants have completed a tour of all the attractions, they have all left pheromones behind, which changes the pheromone trails between all the attractions.

Figure 6.24 Update the pheromone trails

Two steps are involved in updating the pheromone trails: evaporation and depositing new pheromones.

Updating pheromones due to evaporation

The concept of evaporation is also inspired by nature. Over time, the pheromone trails lose their intensity. Pheromones are updated by multiplying their respective current values by an evaporation factor—a parameter that can be adjusted to tweak the performance of the algorithm in terms of exploration and exploitation. Figure 6.25 illustrates the updated pheromone trails due to evaporation.

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