question: limit function parameter to const integers

[shuhuagao]

question: limit function parameter to const integers

[ShuhuaGao]

Generally, the N is not a big number, right? If so, you can simply register multiple shift but with different names. For example, shift1(a) is equivalent to shift(a, 1), shift2(a) is equivalent to shift(a, 2).

[welaunchcn]

Yes that is the work around I'm using. The problem is that since we are having multiple instances for the same function, the creation of individuals tends to give much more weight to it.

[ShuhuaGao]

Yes, you are right. I noticed this issue also for adding terminals. The reason is that each primitive is chosen according to a uniform distribution. Ideally, there should be a weight along with each primitive, but I don't have time to make it for now. You may fork this project and do it at your willingness.

A workaround is that, supposing you have added 5 versions of shift, you can also add other functions 5 times as long as the name parameter in add_function is unique (see source).

[welaunchcn]

Thanks for your help, I will try as your suggested.