Possible naive implementation in Polynomial mutation

[sai_ng]

Hi all,

I've been working on genetic algorithms for a while , and I noticed a possible naive implementation in the deap/mutation.py file. More specifically

We calculate this
delta_1 = (x - xl) / (xu - xl)

delta_2 = (xu - x) / (xu - xl)

...

if rand < 0.5:

   xy = 1.0 - delta_1  # 1 - delta_1 is delta_2, why xy again?

   ....

Let me know your thoughts, cheers!