Problem Addressed
In type-free conventional, Koza-style GP, the function set must meet the requirement of closure: all functions must be capable of accepting as their arguments the output of all other functions in the function set. Usually, this is implemented by dealing with a single data-type such as double-precision floating point. Whilst modern Genetic Programming frameworks supporting typing, such type-systems have limitations that Grammatical Evolution does not suffer from.
Read more about this topic: Grammatical Evolution
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