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Fitness
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The Fitness property is a floating point value that specifies the correctness of the individual DNA. Fitness is used by the genetic components to decide which individuals are better than others. Fitness is a score you define for every individual using an OnEvaluateFitness event handler. It may be any floating point number. However, fitness must have relative meaning among the entire range of assigned fitness numbers, e.g., a fitness of -10 must be worse than a fitness of -3 which must be worse than a fitness of 5, etc (or vice versa, the FitnessMethod property tells the genetic component whether lower or higher numbers are desirable). The NormalizedFitness value is the fitness of the individual normalized over the entire population's fitness values so that it is a value between 0 and 1 (where 0 will be the individual with the lowest fitness and 1 will be the individual with the highest fitness).
Using each individual's calculated fitness and the FitnessMethod, the genetic component will seek to either maximize the solution (e.g., keep evolving for individuals whose fitness are greater than other individuals in the population) or to minimize the solution (e.g., find the individuals whose fitness are less than other individuals).
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WeightedFitness
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Returns the Fitness value weighted by some function. Use the RSGeneticBase.TRSCustomGeneticComponent.OnEvaluateWeightedFitness event to specify the weighting.
The genetic components can guide the search for the best individual by using the weighted fitness instead of the regular fitness. The weighted fitness allows optimization for something other than the pure fitness. For example, with genetic programming, the weighted fitness can be used to weight the fitness for smaller programs. The FitnessMethod specifies whether the Fitness or the WeightedFitness is used in the search.
Note that the Fitness is always used for determining if we have found the "best" individual for termination purposes.
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