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java.lang.Object | +--net.openai.ai.ga.selection.common.SelectLeastFitness
SelectGreatestFitness
is a SelectionAlgorithm
that will return a portion of the passed Population
that
have the least fitness. It will choose either a fixed number or a
percentage.
Constructor Summary | |
SelectLeastFitness(double goalPercentage)
Creates a new SelectGreatestFitness object for choosing
the specified percentage of Cell s out of the specified
Population who have the least fitness. |
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SelectLeastFitness(int goalNumber)
Creates a new SelectLeastFitness object for choosing
the specified number of Cell s out of the specified
Population who have the least fitness. |
Method Summary | |
Population |
selectFromPopulation(Population pop)
Chooses the Cell s in the specified Population
with the least fitness. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public SelectLeastFitness(int goalNumber)
SelectLeastFitness
object for choosing
the specified number of Cell
s out of the specified
Population
who have the least fitness.
goalNumber
- the maximum number of Cell
s to allow
ArithmeticException
- on a negative goalNumberpublic SelectLeastFitness(double goalPercentage)
SelectGreatestFitness
object for choosing
the specified percentage of Cell
s out of the specified
Population
who have the least fitness. The percentage must be
between 0.0 and 1.0, inclusive.
ArithmeticException
- on a negative percentage or on
a percentage greater than 1.0Method Detail |
public Population selectFromPopulation(Population pop)
Cell
s in the specified Population
with the least fitness. For a fixed number, returns a maximum number
depending on the size of the population, but may return fewer if the
population if the population is not that large. For a percentage, returns
a percentage of the population, rounded down (i.e., percentage of 10%
(0.10) on a size of 25 {0.10 * 25 = 2.5} returns a maximum of 2, not
three; a percentage of 10% on a size of 9 {0.10 * 9 = 0.9} will not
return any objects.)
The returned population is guaranteed to return the members of the specified population such that there are no other members in that population who are less than those returned. This means that cells who tie those already in the return population are ignored when their addition would cause the size to exceed that specified. For example, if the fitness of a population was {1,1,2,3,3,3,4,5,5} and the least 4 should be returned, then the returned population will be {1,1,2,3}. The cells who have fitness 1 are kept since their addition will knock more fit members out of the list. However, the other cells of fitness 3 are ignored since their addition could not knock any other cell out.
selectFromPopulation
in interface SelectionAlgorithm
pop
- the Population
to choose from
Population
in arbitrary order
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