Roulette Selection Probabilities

Problem

Compute roulette-wheel selection probabilities.

Return each fitness divided by the total fitness. If the total is 0, return equal probabilities; an empty list returns [].

Hint

Normalize the fitness values so they sum to one.

case 1

in: [[1,2,1]]

expected: [0.25,0.5,0.25]

case 2

in: [[0,0]]

expected: [0.5,0.5]

case 3

in: [[4]]

expected: [1]

case 4

in: [[]]

expected: []

Starter codePython

def roulette_selection_probs(fitness):
    # Your code here
    pass

4 test cases · run your code against them in the editor