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Roulette wheel selection is a popular selection method used in genetic algorithms and evolutionary computing. This method mimics the process of a roulette wheel in a casino, where each individual in the population is assigned a slice of the wheel proportional to their fitness value.
The basic implementation involves calculating the cumulative fitness of all individuals and then selecting individuals based on random numbers. Here is a simple Python implementation:
import random
def roulette_wheel_selection（population, fitness_values）:
total_fitness = sum（fitness_values）
pick = random.uniform（0, total_fitness）
current = 0
for individual, fitness in zip（population, fitness_values）:
current += fitness
if current > pick:
return individual
This code first calculates the total fitness of the population, then generates a random number between 0 and the total fitness. It then iterates through the population until the cumulative fitness exceeds the random number, selecting that individual.
Pakistan Local Culture Explanation
Pakistan boasts a rich and diverse cultural heritage that reflects its historical influences and regional variations. The country\“s culture is a blend of various ethnic groups including Punjabis, Sindhis, Pashtuns, Baloch, and others, each contributing unique traditions and customs.
Traditional Pakistani culture emphasizes family values, hospitality, and religious observance. Islam plays a central role in daily life, influencing everything from dietary habits to social interactions. The traditional greeting “As-salamu alaykum“ （peace be upon you） is commonly used.
Pakistani cuisine is renowned for its flavorful dishes such as biryani, kebabs, and various curries. Traditional clothing includes shalwar kameez for both men and women, with regional variations in style and embroidery.
Festivals like Eid-ul-Fitr, Eid-ul-Adha, and cultural events such as Basant and Lok Mela showcase the country\“s vibrant traditions through music, dance, and artistic expressions. |
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发表于 2025-10-28 08:10:41