Can't use a method as fitness function #69
Replies: 3 comments 2 replies
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I am having a similar issue. Trying to encapsulate all GA in a Class and global variables are not good design pattern.
so then I tried using functools.partial and still no so then I tried using functools.partialmethod and still no. workaround is to remove the argument count checks entirely in pygad.py line 638. In fact actually there are 2 open PR to address this issue. Can we merge one of them and move forward already? |
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I am facing a similar issue, and posted it as Issue Request #138, with a proposed code patch. It allows for PyGAD GA class constructor to accept my class instance reference as a new parameter, and then delivering it to callback methods within my class. If the reference is set to None, then a function may be assumed, else it should call a method with the provisioned reference. I also like PR #92 proposed solution, either one would work for me. Currently, I am using my own patched code with latest Version 2.18.1. Another issue I encountered is with on_crossover and on_mutation callbacks not being called if crossover_type or mutation_type are set to None, respectively. I need for my callbacks to be invoked regardless of type being set to None or not. I need to make adjustments for each solution just before the mutation operation, even when no crossover is required. The zip uploaded code monkeypatch solves this problem. |
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I uploaded pull request #143 which fixes both of my issues. Proposed changes are against PyGAD v2.18.1. I have been testing my implementation with these changes and so far it works well with methods as callbacks. |
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This is now supported. The fitness or any callback can accept a function or a method. |
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Great! |
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I need my fitness function to have a state, for that reason I need to use a method instead of a function in the fitness_func parameter.
The problem is, PyGAD won't accept a method as fitness function.
This happens because PyGAD verifies how many arguments a function have and together with "self" argument a method as fitnees function would have 3 arguments. PyGAD won't let any fitness_func with number of arguments different than 2.
Shouldn't this be changed in the lib?
Does someone know a way around this while this feature isn't provided?
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