Exemple #1
0
func main() {
	seed := time.Now().UTC().UnixNano()
	rand.Seed(seed)
	fmt.Println("Using seed:", seed)

	// Test expr
	// The initialization function creates a tree with specified max depth
	// And it's a closure over the primitives
	exprInit := func(maxDep int) *node.Node {
		return node.MakeTreeHalfAndHalf(maxDep, expr.Functionals, expr.Terminals)
	}
	exprMutate := node.MakeSubtreeMutation(MAX_D, exprInit)
	fmt.Println("Testing representation: expr")
	exprErrorAvg, exprErrorVar := testRepr(exprInit, exprMutate, expr.Draw)
	fmt.Println("expr error avg:", exprErrorAvg, "var:", exprErrorVar)

	// Test ts
	tsInit := func(maxDep int) *node.Node {
		return node.MakeTreeHalfAndHalf(maxDep, ts.Functionals, ts.Terminals)
	}
	tsMutate := node.MakeSubtreeMutation(MAX_D, tsInit)
	fmt.Println("Testing representation: TS")
	tsErrorAvg, tsErrorVar := testRepr(tsInit, tsMutate, ts.Draw)
	fmt.Println("TS error avg:", tsErrorAvg, "var:", tsErrorVar)

	// Test vhs
	vhsInit := func(maxDep int) *node.Node {
		return node.MakeTreeHalfAndHalf(maxDep, vhs.Functionals, vhs.Terminals)
	}
	vhsMutate := node.MakeSubtreeMutation(MAX_D, vhsInit)
	fmt.Println("Testing representation: VHS")
	vhsErrorAvg, vhsErrorVar := testRepr(vhsInit, vhsMutate, vhs.Draw)
	fmt.Println("VHS error avg:", vhsErrorAvg, "var:", vhsErrorVar)
}
Exemple #2
0
func (s *Solution) Mutate() {
	subtrMut := node.MakeSubtreeMutation(s.Conf.MaxDepth, func(maxDep int) *node.Node {
		return node.MakeTreeHalfAndHalf(maxDep, s.Conf.Functionals, s.Conf.Terminals)
	})
	subtrMut(s.Node)
}
Exemple #3
0
func makeMultiMutation(s *base.Settings, multiMut, enbSin, enbNod, enbSub, enbAre, enbLsubt, enbLoc bool) func(float64, *base.Individual) bool {
	// La mutazione a che profondità avviene?
	// Quanto è profondo l'albero che vado a generare?
	// Quanto è profondo l'albero che vado a sostituire?
	// Separare foglie e nodi

	countInt := func(name string, v int) {
		if _, ok := s.IntCounters[name]; !ok {
			s.IntCounters[name] = new(counter.IntCounter)
		}
		s.IntCounters[name].Count(v)
	}

	countBool := func(name string, v bool) {
		if _, ok := s.Counters[name]; !ok {
			s.Counters[name] = new(counter.BoolCounter)
		}
		s.Counters[name].Count(v)
	}

	statFuncSin := func(nDepth, replDepth int, isLeaf bool) {
		countInt(mut_single_node_depth, nDepth)
		countInt(mut_single_node_repld, replDepth)
		countBool(mut_single_node_leaves, isLeaf)
	}
	statFuncNod := func(nDepth, replDepth int, isLeaf bool) {
		countInt(mut_multi_node_depth, nDepth)
		countInt(mut_multi_node_repld, replDepth)
		countBool(mut_multi_node_leaves, isLeaf)
	}
	statFuncTree := func(nDepth, replDepth int, isLeaf bool) {
		countInt(mut_tree_node_depth, nDepth)
		countInt(mut_tree_node_repld, replDepth)
		countBool(mut_tree_node_leaves, isLeaf)
	}
	statFuncArea := func(nDepth, replDepth int, isLeaf bool) {
		countInt(mut_area_node_depth, nDepth)
		countInt(mut_area_node_repld, replDepth)
		countBool(mut_area_node_leaves, isLeaf)
	}
	statFuncLevSubtr := func(nDepth, replDepth int, isLeaf bool) {
		countInt(mut_lsubt_node_depth, nDepth)
		countInt(mut_lsubt_node_repld, replDepth)
		countBool(mut_lsubt_node_leaves, isLeaf)
	}

	singleMut := node.MakeTreeSingleMutation(s.Functionals, s.Terminals, statFuncSin) // func(*Node)
	nodeMut := node.MakeTreeNodeMutation(s.Functionals, s.Terminals, statFuncNod)     // funcs, terms []gp.Primitive)// func(*Node) int {
	subtrMut := node.MakeSubtreeMutation(s.MaxDepth, s.GenFunc, statFuncTree)
	areaMut := node.MakeSubtreeMutationGuided(s.MaxDepth, s.GenFunc, node.ArityDepthProbComputer, statFuncArea)
	subtLevelMut := node.MakeSubtreeMutationGuided(s.MaxDepth, s.GenFunc, node.UniformDepthProbComputer, statFuncLevSubtr)

	const neighbSize = 5 // Neighborhood size for local search

	return func(pMut float64, ind *base.Individual) bool {
		perm := rand.Perm(6) // Randomly permutate the algorithms to pick
		evCount := 0         // Number of events (mutations performed)
		for _, v := range perm {
			event := rand.Float64() < pMut // Perform mutation?
			switch v {
			case 0:
				if enbSin {
					ind.CountEvent(mut_single_event, event)
					if event {
						evCount++
						fit := ind.Evaluate()
						singleMut(ind.Node)
						newFit := ind.Evaluate()
						ind.CountEvent(mut_single_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			case 1:
				if enbNod {
					fit := ind.Evaluate()
					event = nodeMut(pMut, ind.Node) != 0
					ind.CountEvent(mut_multi_event, event)
					if event {
						evCount++
						newFit := ind.Evaluate()
						ind.CountEvent(mut_multi_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			case 2:
				if enbSub {
					ind.CountEvent(mut_tree_event, event)
					if event {
						evCount++
						fit := ind.Evaluate()
						subtrMut(ind.Node)
						newFit := ind.Evaluate()
						ind.CountEvent(mut_tree_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			case 3:
				if enbAre {
					ind.CountEvent(mut_area_event, event)
					if event {
						evCount++
						fit := ind.Evaluate()
						areaMut(ind.Node)
						newFit := ind.Evaluate()
						ind.CountEvent(mut_area_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			case 4:
				if enbLsubt {
					ind.CountEvent(mut_lsubt_event, event)
					if event {
						evCount++
						fit := ind.Evaluate()
						subtLevelMut(ind.Node)
						newFit := ind.Evaluate()
						ind.CountEvent(mut_lsubt_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			default:
				if enbLoc {
					// Local search
					ind.CountEvent(mut_local_event, event)
					if event {
						evCount++
						fit := ind.Evaluate()
						for i := 0; i < neighbSize; i++ {
							mutated := ind.Copy().(*base.Individual) // Copy individual
							singleMut(mutated.Node)                  // Apply mutation
							if s.BetterThan(mutated.Fitness(), ind.Fitness()) {
								// If improved, save the individual
								ind.Node = mutated.Node
								// Invalidate!
								ind.Invalidate()
							}
						}
						// Perform singleMut K times
						newFit := ind.Evaluate()
						ind.CountEvent(mut_local_improv, s.BetterThan(newFit, fit))
					}
					if !multiMut {
						return event
					}
				}
			}
			// In the case we don't execute anything, go to the next method
		}
		// If this happens, all the mutations were disabled, or all the mutations
		// were performed when multi mutation was enabled
		if multiMut {
			countInt(mut_count_multi, evCount)
		}
		return evCount > 0
	}
}