def from_config(world_config):
world = World()
if 'tools' in world_config:
for t in world_config['tools']:
tool = Tool.from_config(t)
world.tools_repo.register_tool(tool)
if 'populations' in world_config:
for p in world_config['populations']:
population = Population.from_config(p)
world.populations.append(population)
if len(world.populations) == 0:
for i in range(0, world_config['populations_count']):
pop_id = Population.generate_id()
size = random.randint(world_config['min_pop_size'], world_config['max_pop_size'])
world.populations.append(Population(pop_id, size))
if len(world.tools_repo) == 0:
min_adopting = 1
max_adopting = round(math.sqrt(len(world.populations)))
for i in range(0, world_config['tools_count']):
tool = Tool.generate_instance()
world.tools_repo.register_tool(tool)
adopting_pops = random.randint(min_adopting, max_adopting)
adopters = random.sample(world.populations, adopting_pops)
[pop.adopt_tool(tool.id) for pop in adopters]
return world
def setUp(self):
turns = ['F', 'L', 'L', 'F', 'R', 'F', 'R']
values = ['P', 'P', 'H', 'P', 'H', 'H', 'P']
self.turnList1 = TurnList(turns, values)
turns2 = ['R', 'L', 'L', 'F', 'L', 'F', 'R']
values2 = ['H', 'P', 'H', 'P', 'H', 'H', 'P']
self.turnList2 = TurnList(turns2, values2)
turns3 = ['F', 'L', 'L', 'F', 'R', 'F', 'R']
values3 = ['P', 'P', 'H', 'P', 'H', 'H', 'P']
self.turnList3 = TurnList(turns3, values3)
bigValues1 = list("PPHPPHHPPHHPPPPPHHHHHHHHHHPPPPPPHHPPHHPPHPPHHHHH")
bigTurns1 = list("FRFRLFLFRFLFFRLFLRRLLRRFRFLFRLLRFRLFLFRLFFFFRLLF")
self.bigTL1 = TurnList(bigTurns1, bigValues1)
bigValues2 = list("PPHPPHHPPHHPPPPPHHHHHHHHHHPPPPPPHHPPHHPPHPPHHHHH")
bigTurns2 = list("FRFRLFLFRFLFFRLFLRRLLRRFRFLFRLLRFRLFLFRLFFFFRLLF")
self.bigTL2 = TurnList(bigTurns2, bigValues2)
self.pop1 = Population([self.turnList1],
[self.turnList1.calculateFitness()])
self.pop2 = Population([self.turnList2],
[self.turnList2.calculateFitness()])
self.pop3 = Population([self.turnList3],
[self.turnList3.calculateFitness()])
self.bigPop1 = Population([self.bigTL1],
[self.bigTL1.calculateFitness()])
self.bigPop2 = Population([self.bigTL2],
[self.bigTL2.calculateFitness()])
self.emptyPopulation = Population()
def __init__(self, sequenceOfValues,
populationSize=100,
generations=200,
elitePercent=.10,
crossoverPercent=.80,
mutationPercent=.25):
self.sequenceOfValues = sequenceOfValues # Values
self.geneLength = len(sequenceOfValues) # Length of a gene
self.populationSize = populationSize # Size of the Population
self.generations = generations # Number of generations to run.
self.elitePercent = elitePercent # Percent of genes to preserve as elite.
self.crossoverPercent = crossoverPercent # Percent of genes to crossover.
self.mutationPercent = mutationPercent # Percent of gene turns to mutate.
self.currentPopulation = Population(genes=[], fitness=[]) # Stores the current Population
self.newPopulation = Population(genes=[], fitness=[]) # Temporary Population used to construct next new population.
self.elites = Population(genes=[], fitness=[]) # The elites set aside while constructing the new population.
self.nonElites = Population(genes=[], fitness=[]) # The non-elites identified from the previous generation.
# Crossed and Uncrossed have references to genes
# from the previous generations - but they will be in their
# mutated form. Use these Population sets for access to
# crossedover indexes and locations.
self.crossed = Population(genes=[], fitness=[]) # The genes which have been crossed over for the new generation.
self.uncrossed = Population(genes=[], fitness=[]) # The genes which where not crossed for the new generation.
# Mutations is the final form of the current generation, minus the
# elites. Use for the information about mutation locations.
self.mutations = Population(genes=[], fitness=[]) # The crossed and uncrossed genes combined for mutation.
self.history = []
def createNewPopulation(self):
"""
Combines the elite genes of the current generation
with those non-elite genes which have been crossed over
and mutated. Stores them in a new population.
"""
self.newPopulation = Population(genes=[], fitness=[])
self.newPopulation.appendPopulation(self.elites)
self.newPopulation.appendPopulation(self.mutations)
def test_population_keeps_track_of_exploration_over_life_cycle(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
assert hasattr(
self.pop, "explorationShortHistory"
), "population must keep track of its exploration history!"
def test_population_keeps_track_of_resources_over_life_cycle(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
assert hasattr(
self.pop, "ecologyShortHistory"
), "population must keep track of its ecological history!"
def test_ecological_time_correctly_assessed(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
self.pop.lifeCycle()
ngen = 5
assert self.pop.ecoTime == self.pop.routineSteps, "one life cycle should be {0} units of ecological time, not {1}".format(
self.pop.routineSteps, self.pop.ecoTime)
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
for i in range(ngen):
self.pop.lifeCycle()
assert self.pop.ecoTime == self.pop.routineSteps * ngen, "{2} life cycles should be {0} units of ecological time, not {1}".format(
self.pop.routineSteps * 10, self.pop.ecoTime, ngen)
def test_population_keeps_track_of_ecological_time(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
assert hasattr(
self.pop,
"ecoTime"), "population must keep track of its ecological time!"
def test_mutants_are_drawn_from_binomial(self, pseudorandom):
pseudorandom(0)
self.nIndividuals = 1000
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create(n=self.nIndividuals)
self.mutationRate = 0.2
self.mutantCount = 0
for ind in self.fakepop.individuals:
ind.mutate(mutRate=self.mutationRate, mutStep=0.05)
if ind.mutant:
self.mutantCount += 1
stat1, pval1 = scistats.ttest_1samp(
[1] * self.mutantCount + [0] *
(self.nIndividuals - self.mutantCount), self.mutationRate)
assert pval1 > 0.05, "T-test mean failed. Observed: {0}, Expected: {1}".format(
self.mutantCount / self.nIndividuals, self.mutationRate)
self.test = scistats.binom_test(self.mutantCount,
self.nIndividuals,
self.mutationRate,
alternative="two-sided")
assert self.test > 0.05, "Success rate = {0} when mutation rate = {1}".format(
self.mutantCount / self.nIndividuals, self.mutationRate)
gc.collect()
def test_population_creates_grid(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create(n=20)
assert hasattr(self.pop, "grid")
assert type(self.pop.grid) is Grid
assert self.pop.grid.resources.shape == (self.pop.gridSize,
self.pop.gridSize)
def test_resources_info_augmented_at_each_routine(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
for i in range(self.pop.routineSteps):
self.pop.routine()
assert self.pop.ecologyShortHistory.shape == ((self.pop.gridSize**2) *
self.pop.routineSteps, 4)
def createMutations(self):
"""
Mutate members of the current population which have
been set aside as non-elite.
NOTE: crossed-over genes have their new instances mutated,
however the non-crossed-over non-elites will have
their original genes (those in the current population)
effected.
"""
self.mutations = Population(genes=[], fitness=[])
self.mutations.appendPopulation(self.crossed)
self.mutations.appendPopulation(self.uncrossed)
numMutations = (self.mutationPercent * self.mutations.size() *
len(self.mutations.getGene(0)))
#self.mutations.mutatePopulation(numMutations)
self.mutations.mutatePopulationWithIncreaseAndCooling(
numMutations, len(self.history))
def test_exploration_info_augmented_at_each_routine(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.predation = 0
self.pop.create()
for i in range(self.pop.routineSteps):
self.pop.routine()
assert self.pop.explorationShortHistory.shape == (
self.pop.nIndiv * self.pop.routineSteps, 4)
def test_resources_crash_when_too_large(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.initRes = 20
self.pop.growth = 100
self.pop.create()
self.pop.lifeCycle()
for cell in np.nditer(self.pop.grid.resources):
assert cell <= self.pop.initRes, "resources too large, should have crashed"
def createNewPopulation(self):
"""
Combines the elite genes of the current generation
with those non-elite genes which have been crossed over
and mutated. Stores them in a new population.
"""
self.newPopulation = Population(genes=[], fitness=[])
self.newPopulation.appendPopulation(self.elites)
self.newPopulation.appendPopulation(self.mutations)
def test_update_replaces_old_gen_with_new_gen(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
self.pop.routine()
self.pop.reproduce()
oldgen = self.pop.individuals
self.pop.update()
assert len(self.pop.individuals) == self.pop.nIndiv
assert self.pop.individuals != oldgen
def test_population_can_gather_vs_survive(self):
assert hasattr(Pop(), "gatherAndSurvive")
assert callable(getattr(Pop(), "gatherAndSurvive"))
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
try:
self.pop.gatherAndSurvive()
except ValueError as e:
assert False, "missing info: {0}".format(e)
def test_mutation_does_not_affect_phenotype_type(self):
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create(n=1)
self.indiv = self.fakepop.individuals[0]
self.phen = self.indiv.vigilance
self.indiv.mutate(mutRate=1, mutStep=0.05)
assert type(self.indiv.vigilance) is float
gc.collect()
def test_fertility_returns_positive_float(self):
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create()
for ind in range(len(self.fakepop.individuals)):
indiv = self.fakepop.individuals[ind]
setattr(indiv, "storage", 1 + 9 * ind)
indiv.reproduce(fecundity=2)
assert type(indiv.fertility) is float
assert indiv.fertility >= 0
def test_population_routine_changes_resources_grid(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
resG = self.pop.grid.resources
self.pop.routine()
compareGrids = self.pop.grid.resources != resG
assert compareGrids.all()
def test_lam_error_when_resources_too_big(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.initRes = 20000000000000000000
self.pop.create()
try:
self.pop.lifeCycle()
except ValueError as e:
assert str(
e
) == 'lam value too large', "This program should fail at poisson random draw, not '{0}'".format(
e)
def test_population_routine_changes_share_grid(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
shareG = self.pop.grid.share
self.pop.routine()
compareGrids = self.pop.grid.share == shareG
assert compareGrids.all() == False
def test_update_returns_population_vigilance_info(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
self.pop.routine()
self.pop.reproduce()
self.pop.update()
assert hasattr(self.pop, "vigilance")
assert self.pop.vigilance is not None
assert type(self.pop.vigilance) is float
assert 0 <= self.pop.vigilance <= 1
def test_mutants_are_defined(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create(n=1)
self.indiv = self.pop.individuals[0]
self.indiv.mutate(mutRate=0.5, mutStep=0.5)
assert hasattr(
self.indiv, "mutant"
), "We don't know if our individual is a mutant because it doesn't have this attribute"
assert type(self.indiv.mutant) is bool
gc.collect()
def test_mutants_get_deviation_from_phenotype(self):
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create(n=1)
self.indiv = self.fakepop.individuals[0]
self.indiv.mutate(mutRate=1, mutStep=0.05)
assert hasattr(
self.indiv, "mutationDeviation"
), "Individual is a mutant: it needs to be set a deviation from phenotype"
assert -1 < self.indiv.mutationDeviation < 1
gc.collect()
def test_population_exploration_gives_share_info(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
self.pop.explore()
m = self.pop.gridSize
assert hasattr(self.pop, "ncell")
assert type(self.pop.ncell) is np.ndarray
assert self.pop.ncell.shape == (m, m)
assert hasattr(self.pop, "vcell")
assert type(self.pop.vcell) is np.ndarray
assert self.pop.vcell.shape == (m, m)
def test_deviation_function_returns_float(self):
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create(n=1)
self.indiv = self.fakepop.individuals[0]
self.v = self.indiv.vigilance
for mutationBool in [True, False]:
self.indiv.mutant = mutationBool
self.indiv.deviate(mutStep=0.05)
assert type(self.indiv.mutationDeviation) is float
gc.collect()
def test_grid_gif_is_created(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
self.pop.launch(dev='on')
self.filesListRootOut = os.listdir("./output")
assert "grid_out.gif" in self.filesListRootOut, "no output grid gif created"
os.remove("output/vigilance_out.txt")
os.remove("output/vigilance_out.gif")
os.remove('output/resources_out.txt')
os.remove('output/exploration_out.txt')
os.remove('output/grid_out.gif')
def test_population_has_plotting_option(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
try:
self.pop.launch(dev='on')
except TypeError as e:
assert False, "allow for 'on' device to show plots"
os.remove("output/vigilance_out.txt")
os.remove("output/vigilance_out.gif")
os.remove('output/resources_out.txt')
os.remove('output/exploration_out.txt')
os.remove('output/grid_out.gif')
def test_fertility_increases_with_storage(self):
self.fakepop = Pop("test/test/parameters.txt")
self.fakepop.create()
fertility = 0
for ind in range(len(self.fakepop.individuals)):
indiv = self.fakepop.individuals[ind]
setattr(indiv, "storage", 1 + 9 * ind)
indiv.reproduce(fecundity=2)
assert indiv.fertility > fertility
fertility = indiv.fertility
def test_gathering_gives_individuals_storage(self):
self.pop = Pop(par="test/test/parameters.txt")
self.pop.create()
self.pop.grid.share = np.full([self.pop.gridSize, self.pop.gridSize],
0.8)
for i in self.pop.individuals:
i.vigilance = 0
self.pop.gatherAndSurvive()
for i in self.pop.individuals:
assert i.storage > 0
def test_only_live_individuals_gather_and_survive(self):
self.pop = Pop("test/test/parameters.txt")
self.pop.create()
self.pop.explore()
for ind in self.pop.individuals:
ind.alive = False
self.pop.gatherAndSurvive()
for ind in self.pop.individuals:
assert ind.alive == False
assert ind.storage == 0
def createMutations(self):
"""
Mutate members of the current population which have
been set aside as non-elite.
NOTE: crossed-over genes have their new instances mutated,
however the non-crossed-over non-elites will have
their original genes (those in the current population)
effected.
"""
self.mutations = Population(genes=[], fitness=[])
self.mutations.appendPopulation(self.crossed)
self.mutations.appendPopulation(self.uncrossed)
numMutations = (self.mutationPercent * self.mutations.size() * len(self.mutations.getGene(0)))
#self.mutations.mutatePopulation(numMutations)
self.mutations.mutatePopulationWithIncreaseAndCooling(numMutations, len(self.history))
def next(self):
"""
Performs the genetic algorithm on the previous population to construct
a new population.
@return: int the current generation.
"""
generation = len(self.history)
# If this is the first iteration of the genetic algorithm,
# a new, random population needs to be created.
if len(self.history) == 0:
self.initializeOriginalPopulation()
self.history.append(self.currentPopulation.getGene(0))
return generation
# For >1 generations, perform the following steps:
elif len(self.history) < self.generations:
# Prepares an empty new population.
self.newPopulation = Population(genes=[], fitness=[])
# 1) Identify the elites.
self.pullElites()
# 2) Perform crossover on the non-elites.
self.createCrossover()
# 3) Perform mutations on the non-elites.
self.createMutations()
# 4) Construct a new population from the elites and non-elites.
self.createNewPopulation()
# 5) Assign the new population to the current population.
self.currentPopulation = self.newPopulation
# Create a history of the highest scoring member of the
# current population.
self.history.append(self.currentPopulation.getGene(0))
return generation
else:
raise StopIteration
class GeneticAlgorithm:
"""
An iterator that implements the genetic algorithm
on a population of TurnList genes.
"""
def __init__(self, sequenceOfValues,
populationSize=100,
generations=200,
elitePercent=.10,
crossoverPercent=.80,
mutationPercent=.25):
self.sequenceOfValues = sequenceOfValues # Values
self.geneLength = len(sequenceOfValues) # Length of a gene
self.populationSize = populationSize # Size of the Population
self.generations = generations # Number of generations to run.
self.elitePercent = elitePercent # Percent of genes to preserve as elite.
self.crossoverPercent = crossoverPercent # Percent of genes to crossover.
self.mutationPercent = mutationPercent # Percent of gene turns to mutate.
self.currentPopulation = Population(genes=[], fitness=[]) # Stores the current Population
self.newPopulation = Population(genes=[], fitness=[]) # Temporary Population used to construct next new population.
self.elites = Population(genes=[], fitness=[]) # The elites set aside while constructing the new population.
self.nonElites = Population(genes=[], fitness=[]) # The non-elites identified from the previous generation.
# Crossed and Uncrossed have references to genes
# from the previous generations - but they will be in their
# mutated form. Use these Population sets for access to
# crossedover indexes and locations.
self.crossed = Population(genes=[], fitness=[]) # The genes which have been crossed over for the new generation.
self.uncrossed = Population(genes=[], fitness=[]) # The genes which where not crossed for the new generation.
# Mutations is the final form of the current generation, minus the
# elites. Use for the information about mutation locations.
self.mutations = Population(genes=[], fitness=[]) # The crossed and uncrossed genes combined for mutation.
self.history = []
def __iter__(self):
return self
def next(self):
"""
Performs the genetic algorithm on the previous population to construct
a new population.
@return: int the current generation.
"""
generation = len(self.history)
# If this is the first iteration of the genetic algorithm,
# a new, random population needs to be created.
if len(self.history) == 0:
self.initializeOriginalPopulation()
self.history.append(self.currentPopulation.getGene(0))
return generation
# For >1 generations, perform the following steps:
elif len(self.history) < self.generations:
# Prepares an empty new population.
self.newPopulation = Population(genes=[], fitness=[])
# 1) Identify the elites.
self.pullElites()
# 2) Perform crossover on the non-elites.
self.createCrossover()
# 3) Perform mutations on the non-elites.
self.createMutations()
# 4) Construct a new population from the elites and non-elites.
self.createNewPopulation()
# 5) Assign the new population to the current population.
self.currentPopulation = self.newPopulation
# Create a history of the highest scoring member of the
# current population.
self.history.append(self.currentPopulation.getGene(0))
return generation
else:
raise StopIteration
def initializeOriginalPopulation(self):
"""
Creates an original population from the values provided
to this GeneticAlgorithm.
"""
for __ in range(self.populationSize):
valid = False
while not valid:
# 1) Produce a sequence of turns using the MonteCarlo algorithm.
sequenceOfTurns = montecarlo.getDefaultMCSequence(self.geneLength)
# 2) Create a TurnList from the sequence of turns and
# their corresponding values.
turnList = TurnList(sequenceOfTurns, self.sequenceOfValues)
# 3) Determine if the sequence of turns is valid.
if not turnList.toCoordinates().hasConflict():
self.currentPopulation.appendGene(turnList)
valid = True
def pullElites(self):
"""
Construct a set of elite members of the population and
a set of non-elite members of the population.
"""
numElites = int(self.populationSize * self.elitePercent)
self.elites, self.nonElites = self.currentPopulation.splitElite(numElites)
def createCrossover(self):
"""
Apply Crossover to the non-elite members of the current
population.
NOTE: New instances of the genes are created.
"""
numCrossovers = int(self.crossoverPercent * self.populationSize / 2 )
#self.crossed, self.uncrossed = self.nonElites.createCrossoverPopulation(numCrossovers)
self.crossed, self.uncrossed = self.nonElites.createCrossoverPopulationWithIncreaseAndCooling(numCrossovers, len(self.history))
def createMutations(self):
"""
Mutate members of the current population which have
been set aside as non-elite.
NOTE: crossed-over genes have their new instances mutated,
however the non-crossed-over non-elites will have
their original genes (those in the current population)
effected.
"""
self.mutations = Population(genes=[], fitness=[])
self.mutations.appendPopulation(self.crossed)
self.mutations.appendPopulation(self.uncrossed)
numMutations = (self.mutationPercent * self.mutations.size() * len(self.mutations.getGene(0)))
#self.mutations.mutatePopulation(numMutations)
self.mutations.mutatePopulationWithIncreaseAndCooling(numMutations, len(self.history))
def createNewPopulation(self):
"""
Combines the elite genes of the current generation
with those non-elite genes which have been crossed over
and mutated. Stores them in a new population.
"""
self.newPopulation = Population(genes=[], fitness=[])
self.newPopulation.appendPopulation(self.elites)
self.newPopulation.appendPopulation(self.mutations)
def displayStateChanges(self):
"""
A visually useful manner of inspecting the current generation of
this Genetic Algorithm.
* The first row references the indexes of the parents
from which the current gene has been crossed-over.
* The second row provides indexes for the genes of the current
generation. An "!" indicates the gene was produced from a crossover
operation that did not complete successfully. A "x" indicates
that the gene was the product of a crossover operation.
* The following rows indicate the turn state of the gene at a particular
cell. A turn surrounded by "<" and ">" indicates a cross-over location
from the previous generation. An "!" indicates a mutation created this cell.
* The final row indicates the fitness of the gene. A "*" indicates an elite
gene that was carried over directly from the previous generation.
"""
I = (len(str(self.populationSize-1)) * 2) + 1
if I < 5:
I = 5
crossedGenes = self.crossed.crossedOverIndexes.keys()
numElites = int(self.populationSize * self.elitePercent)
results = "\n"
# Identify each gene's cross-over parents (if they had any).
for geneIndex in range(len(self.currentPopulation.genes)):
if self.currentPopulation.genes[geneIndex] in crossedGenes:
sourceIndexes = self.crossed.crossedOverIndexes[self.currentPopulation.genes[geneIndex]]
results += str( str(sourceIndexes[0] + numElites) + "x" + str(sourceIndexes[1] + numElites) ).center(I) + "|"
else:
results += str(" " * I) + "|"
results += '\n'
# Identify the gene's current index, whether it was the product of a crossover
# operation, and whether that crossover operation was "bad".
for geneIndex in range(len(self.currentPopulation.genes)):
badCross = False
cross = False
if self.currentPopulation.genes[geneIndex] in self.nonElites.cheapCrosses:
badCross = True
if self.currentPopulation.genes[geneIndex] in crossedGenes:
cross = True
placed = ""
if badCross:
placed += "!"
placed += str(geneIndex)
if cross:
placed += "x"
results += placed.center(I) + "|"
results += '\n'
# A divider.
for geneIndex in range(len(self.currentPopulation.genes)):
results += str("-" * I) + "|"
results += "\n"
# Displays rows for the cell values of each gene, indicating
# crossover points and mutations.
for cellIndex in range(len(self.currentPopulation.genes[0])):
for geneIndex in range(len(self.currentPopulation.genes)):
currentGene = self.currentPopulation.genes[geneIndex]
mutation = False
crossed = False
if (self.mutations.mutationLocations.has_key(currentGene) and
cellIndex in self.mutations.mutationLocations[currentGene]):
mutation = True
if (currentGene in crossedGenes and
self.crossed.crossedOverLocations[currentGene] == cellIndex):
crossed = True
placed = ""
if crossed:
placed += "<"
placed += str(self.currentPopulation.genes[geneIndex].get(cellIndex)[0])
if mutation:
placed += "!"
if crossed:
placed += ">"
results += placed.center(I) + "|"
results += '\n'
# Another divider.
for geneIndex in range(len(self.currentPopulation.genes)):
results += str("-" * I) + "|"
results += "\n"
# Display the fitness value for each gene, indicating whether the gene was elite
# and carried directly from the previous generation.
for geneIndex in range(len(self.currentPopulation.genes)):
if self.currentPopulation.genes[geneIndex] in self.elites.genes:
results += str(str(self.currentPopulation.fitness[geneIndex]) + "*").center(I) + "|"
else:
results += str(self.currentPopulation.fitness[geneIndex]).center(I) + "|"
return results + '\n'
