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evolib.jl
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evolib.jl
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################################################################################
## LIBRARY FOR EVOLUTIONARY ALGORITHMS ##
################################################################################
#
# Authors: Joris Bayer
# Stefan Kroboth
#
# TODO:
# * adopt design to better work with evolutionary strategies not just genetic
# algorithms.
# * more printing functions (human readable)
# * possibility to flag chromosomes as 'bad'
# * test BitGene and adjust mutation/recombination for BitGene
# * RFC: BitGene or BinaryGene
# * different selection/competition models
# - replace parents
# - in competition with parents
# - decision wether a child becomes part of the population or not
# - in short: all that (kappa, lambda) stuff (Papers?)
# * design similar to the one shown in prototype.jl
# - although in a more general way
# * stopping criterion
# * should Vector rather be AbstractArray{T,1} ?
# * when adding Chromosome to Population, check that the number of
# genes per chromosome are the same
# * It could be that sort doesn't need to be implemented as long as
# isless is defined for a certain type -- we should check that
# * [PRIORITY] Remove the dirty hack in roulette!
# * Implement adapting the standard deviation of genes
# * [PRIORITY] Make gray2binary work for bitstrings
# * discuss about how to split up this file
# * [NOT IMPORTANT] try to get the type constraints to work
# * add more to the todo list
#
# DONE:
# * [DONE] Create random Gene with constraints
# * [DONE] Create random Chromosome
# * [DONE] properly implement sort!() for the population
# * [DONE] handling of objective functions
# - [DONE] new idea: get rid of the objective function within types entirely
# * [DONE] roulette wheel selection
# * [DONE] crossover
# * [DONE] mutation
# * [DONE] Create type BitGene for "classical" genetic algorithms
# - [DONE] bits() could be helpful for that
# - [DONE] check if there is a way to convert to gray code
# I have no idea what I'm doing
abstract AbstractEvolutionary
abstract AbstractGene <: AbstractEvolutionary
abstract AbstractChromosome <: AbstractEvolutionary
abstract AbstractPopulation <: AbstractEvolutionary
abstract AbstractGenerations <: AbstractEvolutionary
abstract AbstractGeneticProbabilities <: AbstractEvolutionary
abstract AbstractGeneticOperation <: AbstractEvolutionary
abstract Recombination <: AbstractGeneticOperation
abstract Mutation <: AbstractGeneticOperation
abstract Reproduction <: AbstractGeneticOperation
abstract Immigration <: AbstractGeneticOperation
################################################################################
## GENE TYPE ##
################################################################################
type Gene <: AbstractGene
gene::Number
std::Float64
upper_limit::Float64
lower_limit::Float64
# Point to discuss: Should 'factor' be a part of the Gene type?
# Could be individually adapted, if necessary...
function Gene(gene::Number)
new(gene, 0.5, NaN, NaN)
end
function Gene(gene::Number, std::Float64)
new(gene, std, NaN, NaN)
end
function Gene(gene::Number, std::Float64, upper_limit::Float64,
lower_limit::Float64)
if lower_limit >= upper_limit
error("lower_limit must be less than upper_limit")
end
new(gene, std, upper_limit, lower_limit)
end
end
# Copy-constructor
function copy(gene::Gene)
Gene(copy(gene.gene),
copy(gene.std),
copy(gene.upper_limit),
copy(gene.lower_limit))
end
# Utility functions
std(gene::Gene) = gene.std
function *(factor::Number, gene::Gene)
g = copy(gene)
g.gene *= factor
return g
end
# increase standard deviation
function broaden_std(gene::Gene, factor::Float64)
gene.std *= factor
end
# decrease standard deviation
function narrow_std(gene::Gene, factor::Float64)
gene.std /= factor
end
# create random Gene
rand(T::Type{Gene}) = Gene(rand(), rand())
rand(T::Type{Gene}, std::Float64) = Gene(rand(), std)
rand(T::Type{Gene}, upper_limit::Float64, lower_limit::Float64) = Gene(rand()*(upper_limit-lower_limit)+lower_limit, rand(), upper_limit, lower_limit)
# create value in the given limit
rand(T::Type{Gene}, std::Float64, upper_limit::Float64, lower_limit::Float64) = Gene(rand()*(upper_limit-lower_limit)+lower_limit, std, upper_limit, lower_limit)
################################################################################
## BIT GENE TYPE ##
################################################################################
# TODO why do we store the gene as a string and not as a bitmap?
type BitGene <: AbstractGene
gene::ASCIIString # in gray code
gene_type::Type # for converting back
function BitGene(gene_type::Type, gene::ASCIIString)
if 8*sizeof(gene_type) != length(gene)
error("length of ASCII string does not agree with provided type")
end
new(gene, gene_type)
end
function BitGene{T<:Integer}(gene::T)
new(int2gray(gene), T)
end
end
rand(T::Type{BitGene}) = BitGene(randi(Int64))
rand(T::Type{BitGene}, U::Type) = BitGene(randi(U))
# Binary utility functions
int2gray(num::Integer) = bits(num $ (num >> 1))
function binary2int(bs::ASCIIString)
tmp = copy(bs)
s_len = length(tmp)
out = 0
for i = s_len-1:-1:0
# this feels so dirty...
out += 2^i*parse_int(ASCIIString([uint8(tmp[s_len-i])]))
end
return out
end
function gray2binary(num::Integer)
tmp = copy(num)
shift = 1
while shift < 8*sizeof(num)
tmp = tmp $ (tmp >> shift)
shift *= 2
end
return tmp
end
gray2binary(s::ASCIIString) = gray2binary(binary2int(s))
print(g::BitGene) = println('<',g.gene, '>')
################################################################################
## CHROMOSOME TYPE ##
################################################################################
abstract AbstractGeneVector#TODO move this
Vector{BitGene} <: AbstractGeneVector
type Chromosome <: AbstractChromosome
genes::Vector
length::Int64
fitness::Float64
function Chromosome(genes::Vector)
new(map(copy, genes), length(genes), Inf)
end
function Chromosome(genes::Vector, fitness::Float64)
new(copy(genes), length(genes), copy(fitness))
end
function Chromosome()
new(Gene[], 0, Inf)
end
end
# Copy-constructor
function copy(chr::Chromosome)
Chromosome(copy(chr.genes),
copy(chr.fitness))
end
# referencing
ref(chromosome::Chromosome, ind...) = chromosome.genes[ind...]
# Utility functions
size(chromosome::Chromosome) = chromosome.length
length(chromosome::Chromosome) = chromosome.length
# print the stds of all genes of a chromosome indicated by a range/index
std(chromosome::Chromosome, ind...) = [std(gene) for gene = chromosome[ind...]]
# replace Gene of a Chromosome
function assign(chr::Chromosome, g::Gene, idx::Int64)
chr.genes[idx] = copy(g)
end
# replace Genes of a Chromosome
function assign(chr::Chromosome, gs::Vector{Gene}, idx::Range1{Int64})
chr.genes[idx] = map(copy, gs)
end
# replace Genes of a Chromosome
function assign(chr::Chromosome, gs::Vector{Gene}, idx::Vector{Int64})
end
# push gene onto the chromosome
function push(chr::Chromosome, g::Gene)
push(chr.genes, copy(g))
chr.length += 1
end
(+)(chr::Chromosome, g::Gene) = push(chr, g)
# apply an objective function to a chromosome
function apply_obj_func(chromosome::Chromosome, obj_func::Function)
# untested
chromosome.fitness = obj_func(chromosome)
end
# increase standard deviation of all genes in Chromosome
function broaden_std(chromosome::Chromosome, factor::Float64)
for i = 1:length(chromosome)
# this can probably be done with map
broaden_std(chromosome[i], factor)
end
end
# decrease standard deviation of all genes in Chromosome
function narrow_std(chromosome::Chromosome, factor::Float64)
for i = 1:length(chromosome)
narrow_std(chromosome[i], factor)
end
end
#rand(T::Type{Chromosome}, S::Type{AbstractGene}, num::Int64, x...) = Chromosome([rand(S, x...) | i=1:num]) # neat
rand{GeneType<:AbstractGene}(T::Type{Chromosome},S::Type{GeneType}, num::Int64, x...) = Chromosome([rand(S, x...) for i=1:num]) # neat
# Keep this versionfor compability with old test cases:
rand(T::Type{Chromosome}, num::Int64, x...) = Chromosome([rand(Gene, x...) for i=1:num]) # neat
function rand(T::Type{Chromosome}, num::Int64, obj_func::Function, x...)
chr = rand(T, num, x...)
chr.fitness = obj_func(chr)
#chr = obj_func(chr)
return chr
end
function print(chromosome::Chromosome)
for i = 1:length(chromosome.genes)
print("|")
printf("%.10f", chromosome[i].gene)
end
print("|")
end
# Multiply all genes in the chromosome by a scalar
function *(factor::Number, chromosome::Chromosome)
c = copy(chromosome)
genes = Gene[]
for g in c.genes
push(genes,factor*g)
end
c.genes = genes
return c
end
################################################################################
## POPULATION TYPE ##
################################################################################
type Population <: AbstractPopulation
chromosomes::Vector
pop_size::Int64
# several chromosomes passed
function Population(chromosomes::Vector)
new(chromosomes, length(chromosomes))
# should we copy that too?
end
# one chromosome passed
function Population(chromosome::Chromosome)
new([chromosome], 1)
# should we copy that too?
end
# empty Population
function Population()
new(Chromosome[], 0)
end
function Population(size::Int)
new(Array(Chromosome, size), size)
end
end
# Copy-constructor
function copy(pop::Population)
Population(copy(pop.chromosomes))
end
# referencing
ref(population::Population, ind...) = population.chromosomes[ind...]
# assign
function assign(pop::Population, chr::Chromosome, indx::Int64)
pop.chromosomes[indx] = chr
end
# Utility functions
size(population::Population) = population.pop_size
length(population::Population) = population.pop_size
# overload (+) for easier appending
(+)(pop::Population, chr::Chromosome) = push(pop, chr)
# sum of the fitness of all chromosomes of a population
function fitness_sum(population::Population)
fitness_sum = 0
for i=1:length(population)
fitness_sum += population[i].fitness
end
return fitness_sum
end
# sum of the inverse of fitness of all chromosomes of a population
# needed for roulette
function inv_fitness_sum(population::Population)
fitness_sum = 0
for i=1:length(population)
fitness_sum += 1/population[i].fitness
end
return fitness_sum
end
function print_population(population::Population)
for i=1:length(population)
tmp = population[i]
print("$tmp \n")
end
end
function print_population_evo(population::Population)
for i=1:length(population)
tmp = population[i]
print("$tmp ")
end
print("\n")
end
# Modifiers
function push(population::Population, chromosome::Chromosome)
push(population.chromosomes, copy(chromosome))
population.pop_size += 1
end
function isless(chr1::Chromosome, chr2::Chromosome)
return chr1.fitness < chr2.fitness
end
ismore(chr1::Chromosome, chr2::Chromosome) = !isless(chr1, chr2)
# in-place sort
function sort!(population::Population)
sort!(isless, population.chromosomes)
end
# sort
function sort(population::Population)
sort(isless, population.chromosomes)
end
# in-place reverse sort
function sortr!(population::Population)
sort!(ismore, population.chromosomes)
end
# reverse sort
function sortr(population::Population)
sort(ismore, population.chromosomes)
end
# increase standard deviation of all genes in Chromosome
function broaden_std(population::Population, factor::Float64)
for i = 1:length(population)
# this can probably be done with map
broaden_std(population[i], factor)
end
end
# decrease standard deviation of all genes in Chromosome
function narrow_std(population::Population, factor::Float64)
for i = 1:length(population)
narrow_std(population[i], factor)
end
end
# well, that one was easy.
rand(T::Type{Population}, chr_num::Int64, gene_num::Int64, obj_func::Function, x...) = Population([rand(Chromosome, gene_num, obj_func, x...) for i = 1:chr_num])
rand(T::Type{Population}, chr_num::Int64, gene_num::Int64, x...) = Population([rand(Chromosome, gene_num, x...) for i = 1:chr_num])
################################################################################
## GENERATIONS TYPE ##
################################################################################
# keeps track of generations
type Generations <: AbstractGenerations
populations::Array
generations::Int64
function Generations(population)
new([copy(population)], 1)
end
function Generations()
new(Population[], 0)
end
end
# Copy-Constructor
# does this even make sense for Generations?
function copy(gen::Generations)
Generations(copy(populations),
copy(generations))
end
# referencing
ref(generations::Generations, ind...) = generations.populations[ind...]
# Utility functions
get_generations(generations::Generations) = generations.generations
# Modifiers
function push(generations::Generations, population::Population)
push(generations.populations, copy(population))
generations.generations += 1
end
(+)(generations::Generations, population::Population) = push(generations, population)
################################################################################
## DATASTRUCTURE FOR GENETIC ALGORITHM PROBABILITIES ##
################################################################################
type GeneticProbabilities <: AbstractGeneticProbabilities
mutation::Float64
recombination::Float64
reproduction::Float64
immigration::Float64
function GeneticProbabilities(mutation::Float64,
recombination::Float64,
reproduction::Float64,
immigration::Float64)
sum = mutation + recombination + reproduction + immigration
new(mutation/sum, recombination/sum, reproduction/sum, immigration/sum)
end
end
get_vector(gp::GeneticProbabilities) = [gp.mutation, gp.recombination, gp.reproduction, gp.immigration]
################################################################################
## FUNCTIONS ##
################################################################################
# Roulette Wheel Selection on Population
function roulette(pop::Population)
#sort!(pop) # I don't think sorting is necessary and might even lead to
# problems... gotta check that
f_sum = inv_fitness_sum(pop)
idx = rand()*f_sum
x = 0
elem = 1
for i=1:length(pop)
# DIRTY DIRTY HACK!
# This is supposed to work without abs(), but this leads to problems when
# negative fitness is allowed... we have to find a fix for this.
x += abs(1/pop[i].fitness)
if idx < x
return elem
end
elem += 1
end
error("weird error that should not happen. You probably didn't define a fitness.")
end
# return several indices determined by roulette
roulette(pop::Population, num::Int64) = [ roulette(pop) for i = 1:num ]
# Roulette Wheel Selection on general Vectors (in case probabilies are passed)
function roulette(p::Vector{Float64})
# Am I thinking wrong? Is sorting even necessary?
#prop = sortr(p) # do not sort in-place!
prop = copy(p)
prop_sum = sum(prop) # In case it doesn't sum up to 1
idx = rand()*prop_sum
x = 0
elem = 1
for i=1:length(prop)
x += prop[i]
if idx < x
return elem
end
elem += 1
end
error("dafuq?")
end
# roulette wheel selection on GeneticProbabilities
function roulette(gp::GeneticProbabilities)
idx = roulette(get_vector(gp))
if idx == 1
return Mutation
elseif idx == 2
return Recombination
elseif idx == 3
return Reproduction
elseif idx == 4
return Immigration
else
error("Error: Impossible Error.")
end
end
# make sure the gene doesn't exceed it's limits
function assess_limits(g::Gene)
# works with NaNs!
if g.gene > g.upper_limit
g.gene = g.upper_limit
elseif g.gene < g.lower_limit
g.gene = g.lower_limit
end
end
# mutate a single gene
function mutate!(g::Gene)
g.gene += g.std*randn()
assess_limits(g)
end
function mutate(g::Gene)
gn = copy(g)
gn.gene += gn.std*randn()
assess_limits(gn)
return gn
end
# mutate a single gene with a predefined standard deviation
# -> ignores std settings in g.gene
function mutate!(g::Gene, std::Float64)
g.gene += std*randn()
assess_limits(g)
end
function mutate(g::Gene, std::Float64)
gn = copy(g)
gn.gene += std*randn()
assess_limits(gn)
return gn
end
# mutate a chromosome
function mutate!(chr::Chromosome)
for i=1:length(chr)
mutate!(chr[i])
end
end
function mutate(chr::Chromosome)
chrn = Chromosome()
for i=1:length(chr)
chrn + mutate(chr[i])
end
return chrn
end
# mutate a chromosome with a predefined standard deviation
# -> ignores std settings in g.gene
function mutate!(chr::Chromosome, std::Float64)
for i=1:length(chr)
mutate!(chr[i], std)
end
end
function mutate(chr::Chromosome, std::Float64)
chrn = Chromosome()
for i=1:length(chr)
chrn + mutate(chr[i], std)
end
return chrn
end
# mutate a whole population (not sure if anyone will ever need this)
function mutate!(pop::Population)
for i=1:length(pop)
mutate!(pop[i])
end
end
function mutate(pop::Population)
popn = Population()
for i=1:length(pop)
popn + mutate(pop[i])
end
return popn
end
# mutate a whole population with predefined std (not sure if anyone will ever need this)
function mutate!(pop::Population, std::Float64)
for i=1:length(pop)
mutate!(pop[i], std)
end
end
function mutate(pop::Population, std::Float64)
popn = Population()
for i=1:length(pop)
popn + mutate(pop[i], std)
end
return popn
end
# in-place crossover
function crossover!(chr1::Chromosome, chr2::Chromosome, slices::Int)
@assert length(chr1) == length(chr2)
# weird, even works when rand produces 0
idx = sort([1, int(round(length(chr1) * rand(slices))), length(chr1)+1])
tmp = copy(chr1)
for i=1:length(idx)-1
if i%2 == 0
range = [idx[i]:idx[i+1]-1]
chr1[range] = map(copy, chr2[range])
chr2[range] = map(copy, tmp[range])
end
end
end
function crossover!(pop::Population, slices::Int64)
idx = roulette(pop, 2)
crossover!(pop[idx[1]], pop[idx[2]], slices)
end
# crossover
function crossover(chr1::Chromosome, chr2::Chromosome, slices::Int)
@assert length(chr1) == length(chr2)
# weird, even works when rand produces 0
idx = sort([1, int(round((length(chr1)-1) * rand(slices)))+1, length(chr1)+1])
#tmp = copy(chr1)
chr1n = copy(chr1)
chr2n = copy(chr2)
for i=1:length(idx)-1
if i%2 == 0
range = [idx[i]:idx[i+1]-1]
chr1n[range] = map(copy, chr2[range])
chr2n[range] = map(copy, chr1[range])
end
end
return chr1n, chr2n
end
function crossover(pop::Population, slices::Int64)
idx = roulette(pop, 2)
return crossover(pop[idx[1]], pop[idx[2]], slices)
end
crossover(chr1::Chromosome, chr2::Chromosome) = crossover(chr1, chr2, 2)
crossover(pop::Population) = crossover(pop, 2)
################################################################################
## GENETIC ALGORITHM ##
################################################################################
function genetic(pop::Population, probabilities::GeneticProbabilities,
iter::Int, obj_func::Function)
# First version of a genetic algorithm - pretty basic, needs a lot more functionality and
# probably even a better design and more flexibility.
pop_o = copy(pop) # prevent in-place fiasco
obj_func(pop_o) # make sure the the fitness for every chromosome is available
sort!(pop_o)
best = pop_o[1]
best_generation = 0
convergence = zeros(Float, iter)
for j = 1:iter # max generations
pop_n = Population(length(pop_o))
operations = [roulette(probabilities) for i in 1:length(pop_o)]
for i = 1:length(pop_o)
operation = operations[i]
if operation == Mutation
chr = mutate(pop_o[roulette(pop_o)])
elseif operation == Recombination
chr = crossover(pop_o)
#pop_n + chr[2] # ugly, I know
chr = chr[1]
elseif operation == Reproduction
chr = copy(pop_o[roulette(pop_o)])
elseif operation == Immigration
chr = rand(Chromosome, length(pop_o[1]), obj_func)
end
pop_n[i] = chr
end
obj_func(pop_n)
sort!(pop_n)
#print(pop_n[1].fitness) # TODO: print if debug flag
# Store best chromosome (don't know if the original algo does this as well)
if pop_n[1].fitness < best.fitness
best = pop_n[1]
best_generation = j
end
convergence[j] = best.fitness
#gen + pop_n
pop_o = copy(pop_n)
end
#println("Genetic algorithm found best solution w/ fitness $(best.fitness) in generation $best_generation.")
return best, convergence
end
################################################################################
## EVOLUTIONARY ALGORITHM ##
################################################################################
function evo_1plus1(pop::Population, epsilon::Number, factor::Float64,
prop_pos::Float64, iter::Integer, inner_iter::Integer,
obj_func::Function)
# doesn't fit perfectly in the current design, therefore each chromosome
# is assumed to only consist of one Gene.
# We could also just let the User pass one Chromosome, which doesn't fit
# nicely in the theory which is defined as only to act on the Chromosome.
pop_o = copy(pop)
prev_fitness = obj_func(pop_o)
while true # not really clear if this is necessary from the lecture notes
pos_mut = 0;
for i=1:iter
# create new, mutated population
pop_n = Population()
for k=1:length(pop_o)
pop_n + mutate(pop_o[k])
end
fitness = obj_func(pop_n)
# abort mission
if abs(prev_fitness - fitness) < epsilon
print("Optimum: ")
print_population_evo(pop_o)
return pop_n
elseif i%inner_iter == 0
# adapt std after inner_iter iterations
if pos_mut/i < prop_pos
broaden_std(pop_o, factor) # ooops, this might be implementend the wrong way, check
else
narrow_std(pop_o, factor)
end
end
# survival of the fittest
if fitness < prev_fitness
pop_o = copy(pop_n)
print_population_evo(pop_o)
pos_mut += 1
prev_fitness = fitness
end
end
end
end
function evo_slash(pop::Population, rho::Integer, lambda::Integer, iter::Integer,
factor::Float64, epsilon::Float64, obj_func::Function)
# rho is the number of parents involved in one descendent. the design does
# not account for that for now, therefore it is a useless parameter.
pop_o = copy(pop)
obj_func(pop_o)
mu = length(pop_o)
prev_fitness = Inf
for i=1:iter
pop_n = Population()
while length(pop_n) < lambda
chrs = crossover(pop_o)
# randomly adjust std of Genes. Not sure if this is
# supposed to be done for each new chromosome individually
# or for the whole new population...
for j=1:length(chrs)
if randbit() == 1
broaden_std(chrs[j], factor)
else
narrow_std(chrs[j], factor)
end
# push mutated thingy
pop_n + mutate(chrs[j])
end
end
obj_func(pop_n)
sort!(pop_n)
# slice new population
pop_o = Population(pop_n[1:mu])
# stopping criterion
# not good at all....
if abs(prev_fitness - pop_o[1].fitness) < epsilon
print("Optimum: ")
print(pop_o[1])
println()
return pop_o
end
print(pop_o[1])
println()
prev_fitness = copy(pop_o[1].fitness)
end
pop_o
end