What is tournament selection in genetic algorithms?

What is tournament selection in genetic algorithms?

Tournament selection is a method used in genetic algorithms to select individuals for reproduction. It involves randomly selecting a subset of individuals from the population and choosing the best one among them based on fitness.

How does tournament size affect selection pressure?

The tournament size directly influences selection pressure. A larger tournament size increases the chance of selecting fitter individuals, while a smaller size may lead to more diversity in the selected individuals.

Can you explain how to implement tournament selection in code?

Sure! You can implement tournament selection by randomly selecting a few individuals, comparing their fitness, and returning the best one. Would you like a code example?

Yes, please provide a Python code example.

Here's a simple Python implementation:

import random

def tournament_selection(population, tournament_size):
    tournament = random.sample(population, tournament_size)
    winner = max(tournament, key=lambda ind: ind.fitness)
    return winner