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object --+ | SafeFitnessMutation
Perform mutations, but do not allow decreases in organism fitness.
This doesn't actually do any mutation work, but just checks that newly create organisms do not have lower fitnesses.
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Initialize to do safe mutations Arguments: o actual_mutation - A Mutation class which actually implements mutation. functionality. o accept_less - A probability to accept mutations which generate lower fitness. This allows you to accept some crossovers which reduce fitness, but not all of them.
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