func TopologyOrWeightMutator(cortex *ng.Cortex) (success bool, result MutateResult) {
randomNumber := ng.RandomIntInRange(0, 100)
didMutate := false
var mutators []CortexMutator
if randomNumber > 90 {
mutators = []CortexMutator{MutateActivation}
} else if randomNumber > 80 {
mutators = []CortexMutator{MutateAllWeightsBellCurve}
} else if randomNumber > 20 {
// apply topological mutation
includeNonTopological := false
mutators = CortexMutatorsNonRecurrent(includeNonTopological)
} else {
mutators = CortexMutatorsNonTopological()
}
// before we mutate the cortex, we need to init it,
// otherwise things like Outsplice will fail because
// there are no DataChan's.
cortex.Init()
for i := 0; i <= 100; i++ {
randInt := RandomIntInRange(0, len(mutators))
mutator := mutators[randInt]
didMutate, _ = mutator(cortex)
if !didMutate {
logg.LogTo("NEURVOLVE", "Mutate didn't work, retrying...")
continue
}
break
}
logg.LogTo("NEURVOLVE", "did mutate: %v", didMutate)
success = didMutate
result = "nothing"
return
}
func neuronAddInlink(neuron *ng.Neuron, availableNodeIds []*ng.NodeId) (bool, *ng.InboundConnection) {
if len(availableNodeIds) == 0 {
log.Printf("Warning: unable to add inlink to neuron: %v", neuron)
return false, nil
}
randIndex := ng.RandomIntInRange(0, len(availableNodeIds))
chosenNodeId := availableNodeIds[randIndex]
return true, neuronAddInlinkFrom(neuron, chosenNodeId)
}
func NeuronMutateActivation(neuron *ng.Neuron) (bool, MutateResult) {
encodableActivations := ng.AllEncodableActivations()
for i := 0; i < 100; i++ {
// pick a random activation function from list
randomIndex := ng.RandomIntInRange(0, len(encodableActivations))
chosenActivation := encodableActivations[randomIndex]
// if we chose a different activation than current one, use it
if chosenActivation.Name != neuron.ActivationFunction.Name {
neuron.ActivationFunction = chosenActivation
return true, nil
}
}
// if we got this far, something went wrong
return false, nil
}
func RandomIntInRange(min, max int) int {
return ng.RandomIntInRange(min, max)
}