def test_SequentialDriver_with_rosenbrock(self):
"""Test :class:`gc3libs.optimizer.drivers.SequentialDriver
"""
# Test parameters
magic_seed = 100
dim = 2
pop_size = 100
lower_bounds = -2 * np.ones(dim)
upper_bounds = +2 * np.ones(dim)
prob_cross = 0.8
configure_logger(level=logging.CRITICAL)
log = logging.getLogger("gc3.gc3libs")
initial_pop = draw_population(
lower_bds=lower_bounds,
upper_bds=upper_bounds,
dim=dim,
size=pop_size,
in_domain=self.rosenbrock_sample_filter,
seed=magic_seed)
algo = DifferentialEvolutionAlgorithm(
initial_pop=initial_pop,
de_step_size=0.85, # DE-stepsize ex [0, 2]
prob_crossover=prob_cross,
# crossover probabililty constant ex [0, 1]
itermax=1000, # maximum number of iterations (generations)
dx_conv_crit=None, # stop when variation among x's is < this
y_conv_crit=1e-5, # stop when ofunc < y_conv_crit
de_strategy='DE_local_to_best',
logger=log,
in_domain=self.rosenbrock_sample_filter,
seed=magic_seed,
after_update_opt_state=[print_stats, log_stats]
#, plot_population(temp_stage_dir)]
)
assert algo.de_step_size == 0.85
assert algo.prob_crossover == prob_cross
assert algo.itermax == 1000
assert algo.dx_conv_crit is None
assert algo.y_conv_crit == 1e-5
assert algo.de_strategy == 'DE_local_to_best'
assert algo.logger == log
opt = SequentialDriver(
algo,
target_fn=self.rosenbrock_fn,
fmt="%12.8f")
assert opt.target_fn == self.rosenbrock_fn
# run the Diff.Evo. algorithm
opt.de_opt()
assert algo.has_converged()
assert (algo.best_y - 0.) < algo.y_conv_crit
assert (algo.best_x[0] - 1.) < 1e-3
assert (algo.best_x[1] - 1.) < 1e-3
def test_SequentialDriver_with_rosenbrock(self):
"""Test :class:`gc3libs.optimizer.drivers.SequentialDriver
"""
# Test parameters
magic_seed = 100
dim = 2
pop_size = 100
lower_bounds = -2 * np.ones(dim)
upper_bounds = +2 * np.ones(dim)
prob_cross = 0.8
configure_logger(level=logging.CRITICAL)
log = logging.getLogger("gc3.gc3libs")
initial_pop = draw_population(lower_bds=lower_bounds,
upper_bds=upper_bounds,
dim=dim,
size=pop_size,
in_domain=self.rosenbrock_sample_filter,
seed=magic_seed)
algo = DifferentialEvolutionAlgorithm(
initial_pop=initial_pop,
de_step_size=0.85, # DE-stepsize ex [0, 2]
prob_crossover=prob_cross,
# crossover probabililty constant ex [0, 1]
itermax=1000, # maximum number of iterations (generations)
dx_conv_crit=None, # stop when variation among x's is < this
y_conv_crit=1e-5, # stop when ofunc < y_conv_crit
de_strategy='DE_local_to_best',
logger=log,
in_domain=self.rosenbrock_sample_filter,
seed=magic_seed,
after_update_opt_state=[print_stats, log_stats]
#, plot_population(temp_stage_dir)]
)
assert algo.de_step_size == 0.85
assert algo.prob_crossover == prob_cross
assert algo.itermax == 1000
assert algo.dx_conv_crit is None
assert algo.y_conv_crit == 1e-5
assert algo.de_strategy == 'DE_local_to_best'
assert algo.logger == log
opt = SequentialDriver(algo,
target_fn=self.rosenbrock_fn,
fmt="%12.8f")
assert opt.target_fn == self.rosenbrock_fn
# run the Diff.Evo. algorithm
opt.de_opt()
assert algo.has_converged()
assert (algo.best_y - 0.) < algo.y_conv_crit
assert (algo.best_x[0] - 1.) < 1e-3
assert (algo.best_x[1] - 1.) < 1e-3
def drive_optimization(
population_size,
dim,
lower_bounds,
upper_bounds,
# DE-specific parameters
de_strategy="DE_local_to_best",
de_step_size=0.85,
prob_crossover=1.0,
exp_cross=False,
# converge-related parameters
itermax=100,
dx_conv_crit=1e-6,
y_conv_crit=None,
# misc
in_domain=None,
seed=None,
logger=None,
after_update_opt_state=[],
):
"""
Driver script
It uses DifferentialEvolutionAlgorithm as an implementation of
Ken Price's differential evolution
algorithm: [[http://www1.icsi.berkeley.edu/~storn/code.html]].
"""
if logger is None:
configure_logger(level=logging.CRITICAL)
logger = logging.getLogger("gc3.gc3libs")
if in_domain is None:
def _default_in_domain(pop):
return (pop < upper_bounds).all(axis=1) & (pop > lower_bounds).all(axis=1)
in_domain = _default_in_domain
opt = DifferentialEvolutionAlgorithm(
initial_pop=np.zeros((population_size, dim)),
de_step_size=de_step_size, # DE-stepsize ex [0, 2]
prob_crossover=prob_crossover, # crossover probabililty constant ex [0, 1]
itermax=itermax, # maximum number of iterations (generations)
dx_conv_crit=dx_conv_crit, # stop when variation among x's is < this
y_conv_crit=y_conv_crit, # stop when ofunc < y_conv_crit
de_strategy=de_strategy,
logger=logger,
in_domain=in_domain,
)
opt.vals = np.ones(population_size) * PENALTY_VALUE # init
""" Jobs: create and manage population """
try:
pop = getJobs(throw=True)
except Exception as ex: # server error
print ex
return
if not pop: # empty
# Initialize population using the arguments passed to the
# DifferentialEvolutionParallel initialization
opt.new_pop = draw_population(lower_bds=lower_bounds, upper_bds=upper_bounds, size=population_size, dim=dim)
putJobs(pop2Jobs(opt))
else:
# finished?
finished, count = True, 0
for job in pop:
finished &= job.finished
count += job.finished
cur_iter = job.iteration - 1 # opt iter index start with 0
print "Iter(%d): %d finished jobs" % (cur_iter + 1, count)
if opt.cur_iter != cur_iter:
restoreCurrentPop(opt, cur_iter) # restore current population and iteration counter
if finished:
# Update population and evaluate convergence
newVals = np.zeros(population_size)
opt.new_pop = np.zeros((population_size, dim))
k = 0
for job in pop:
opt.new_pop[k, :] = job.params
newVals[k] = job.result if job.result != None else PENALTY_VALUE
k += 1
opt.update_opt_state(opt.new_pop, newVals)
putPop(opt)
print [opt.best_y, opt.best_x]
if opt.cur_iter > opt.itermax:
print "Maximum number of iterations exceeded after [%d] steps. " % (opt.cur_iter)
# sys.exit()
if not opt.has_converged():
# Generate new population and enforce constrains
opt.new_pop = opt.evolve()
# Push all and run again!
putJobs(pop2Jobs(opt))
return True
else:
# Once iteration has terminated, extract `bestval` which should represent
# the element in *all* populations that lead to the closest match to the
# empirical value
print "Calibration converged after [%d] steps. " % (opt.cur_iter)
sys.exit()
# # VM's: create and manage dispatchers
# vms = getVMs()
#
# if not vms: # empty
# print "[+] No running EC2 instances found, creating %d" % N_NODES
# nodes = fp_ec2_create_vms(N_NODES, pubkey_file='/home/tklauser/.ssh/id_rsa.pub')
# vms = []
# for node in nodes:
# vm = { 'ip' : node.public_ips[0], 'vmtype' : 'Amazon', 'dateUpdate' : str(datetime.datetime.now()) }
# vms.append(vm)
# putVMs(vms)
# else:
# pass #TODO manage VMs
# Then, we could also run the forwardPremium binary here; Single script solution
return False
