47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
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package gago
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import (
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"log"
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"math/rand"
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"time"
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)
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// A Population contains individuals. Individuals mate within a population.
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// Individuals can migrate from one population to another. Each population has a
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// random number generator to bypass the global rand mutex.
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type Population struct {
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Individuals Individuals `json:"indis"`
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Age time.Duration `json:"age"`
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Generations int `json:"generations"`
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ID string `json:"id"`
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rng *rand.Rand
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}
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// Generate a new population.
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func newPopulation(size int, gf GenomeFactory, id string) Population {
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var (
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rng = newRandomNumberGenerator()
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pop = Population{
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Individuals: newIndividuals(size, gf, rng),
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ID: id,
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rng: rng,
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}
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)
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return pop
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}
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// Log a Population's current statistics with a provided log.Logger.
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func (pop Population) Log(logger *log.Logger) {
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logger.Printf(
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"pop_id=%s min=%f max=%f avg=%f std=%f",
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pop.ID,
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pop.Individuals.FitMin(),
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pop.Individuals.FitMax(),
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pop.Individuals.FitAvg(),
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pop.Individuals.FitStd(),
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)
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}
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// Populations type is necessary for migration and speciation purposes.
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type Populations []Population
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