def _main_loop(self, ref_set, scenario_builder, population):
stop = False
last_changed = 0
iteration = 0
while not stop:
start_loop = datetime.now()
# create the pool from combining solutions from ref_set
logging.info("Performing combinations")
start = datetime.now()
pool = self._combine(ref_set, scenario_builder)
logging.info("Combinations %s" % (datetime.now() - start))
# improve pool
logging.info("Improving best combinations")
start = datetime.now()
pool = self._mp_improve(pool, scenario_builder)
logging.info("Improvements %s" % (datetime.now() - start))
# join ref_set and pool together
union = deepcopy(ref_set)
union.add_container(pool)
union.sort()
new_ref_set = self._ref_set_update(union)
if ref_set.same(new_ref_set):
logging.info("Ref_set not changed")
new_ref_set = ScatterPhenoScenarioContainer()
for i in range(self._b/2):
new_ref_set.add(union.get(i))
# get the most diverse solutions to what
# we already have in ref_set
while new_ref_set.len() < self._b:
new_ref_set.add(population.get_diverse(new_ref_set))
if ref_set.same(new_ref_set):
last_changed += 1
else:
last_changed = 0
if last_changed >= 5:
logging.info("Reached optimal solution, terminating...")
stop = True
if os.path.exists('/home/eey9/.stop_scatter_search'):
stop = True
logging.info("Stopping because of file flag...")
ref_set = new_ref_set
iteration += 1
logging.info("Completed iteration %d" % iteration)
self._report(ref_set, scenario_builder)
t_delta = datetime.now() - start_loop
logging.info("Iteration time %s" % t_delta)
return
def _ref_set_update(self, source):
source.sort()
ref_set = ScatterPhenoScenarioContainer()
for i in range(self._b/2):
ref_set.add(source.get(i))
# get the most diverse solutions to what we already have in ref_set
while ref_set.len() < self._b:
ref_set.add(source.get_diverse(ref_set))
return ref_set
def _improve(self, individual, scenario_builder):
start = datetime.now()
base = importr("base")
candidate_list = self._build_candidate_list(individual)
improvements = ScatterPhenoScenarioContainer()
for var in candidate_list:
new_scenario = scenario_builder.flip(individual, var)
if new_scenario.same(individual) or \
not new_scenario.valid(process=True):
continue
new_scenario = self._evaluate(new_scenario, base)
if not improvements.contains(new_scenario):
improvements.add(new_scenario)
for i in range(len(individual.get_solution())):
for j in range(i + 1, len(individual.get_solution())):
new_scenario = scenario_builder.swap(individual, i, j)
if new_scenario.same(individual) or \
not new_scenario.valid(process=True):
continue
new_scenario = self._evaluate(new_scenario, base)
if not improvements.contains(new_scenario):
improvements.add(new_scenario)
if not self._database.contains(new_scenario):
self._database.add(new_scenario)
improvements.sort()
logging.info("self._improve finished - %s" %
(datetime.now() - start))
return {'individual': individual,
'improvements': improvements}
def g1(self, count):
done = False
iterations = 0
while not done:
solutions = ScatterPhenoScenarioContainer()
seed_solution = self._random_solution()
solutions.add(seed_solution)
h_max = self._n
# maximum number of solutions is h_max - 1
if count > h_max - 1:
raise Exception("Could not generate %d solutions with "
"G1 and h_max %d" % (count, h_max))
for h in range(2, h_max):
new_solution = deepcopy(seed_solution)
index = 0
while index < self._n:
new_solution.toggle(index)
index += h
if solutions.len() < count and \
new_solution.valid(process=self._process):
solutions.add(new_solution)
else:
break
if solutions.len() == count:
done = True
else:
iterations += 1
if iterations > 10:
raise Exception("Could not generate enough valid solutions")
return solutions
def _combine(self, container, scenario_builder):
# build subsets
combinations = self._build_combinations(container)
pool = ScatterPhenoScenarioContainer()
for combination in combinations:
start = datetime.now()
try:
new_scenario = scenario_builder.combine(combination[0],
combination[1],
self._score_table)
except NoValidSolutionException:
logging.info("Combination %d/%d - %s: no valid solution" %
(combinations.index(combination) + 1,
len(combinations),
(datetime.now() - start)))
continue
self._update_score_table(new_scenario)
if not pool.contains(new_scenario):
pool.add(new_scenario)
# see where does the scenario qualify to be in container
try:
j = container.index(next(x for x in container.get_all()
if new_scenario.get_utility() <
x.get_utility()))
scenario_builder.success(self._b - j)
except StopIteration:
continue # Worse than anything in ref_set, does not qualify
logging.info("Combination %d/%d - %s" %
(combinations.index(combination) + 1,
len(combinations),
(datetime.now() - start)))
return pool
class ScatterPhenoAlgorithm:
def __init__(self, data, scenario, root_dir, load=False):
"""data - {'cd_data': [], 'ml_data': []}
scenario - 'simple_ml' or 'process_ml'
"""
# hardcoded algorithm variables, could supply them to the
# constructor if needed
# self._PSize = 45 TODO real value
self._PSize = 12
# weight for previous score entry, when updating the score table
self._alpha = 0.3
# self._b = 20 TODO real value
self._b = 8
self._proc_count = 4
# set class variables
self._variables = [formats.STEM_COUNT, formats.CANOPY_HEIGHT,
formats.TRANSMISSION, formats.FLOWERING_SCORE,
formats.LEAF_AREA_INDEX, formats.COL,
formats.ROW, formats.DD, formats.GENOTYPE,
formats.RAINFALL, formats.DOY, formats.PAR]
self._variables.sort()
self._scenario = scenario
self._root_dir = root_dir
if scenario == "simple_ml":
self._methods = ['rf', 'knn', 'gbm']
elif scenario == "compound":
self._methods = ['NaiveMLProcessModelMemfix', 'GAWinModel']
else:
raise Exception("STUB") # TODO
self._data = self._hack_data(data)
self._months = list(set([x[formats.DATE].strftime("%B") for x in
self._data['ml_data']]))
self._months.sort()
# find maximum RMSE for methods
self._max_rmse = self._get_max_rmse()
# DB to contain all solutions ever explored
self._database = ScatterPhenoScenarioContainer()
self._score_table = self._empty_score_table()
if load:
sc_file = os.path.join(self._root_dir, 'score_table.csv')
self._score_table = CSVFileReader(sc_file).get_content()
for entry in self._score_table:
entry['score'] = float(entry['score'])
entry['value'] = (entry['value'] == "True")
db_file = os.path.join(self._root_dir, 'database.csv')
self._database.load_file(db_file, self._data)
self._update_score_table()
self._run_algorithm2()
else:
self._run_algorithm()
def _run_algorithm2(self):
"""Algorithm main method"""
scenario_builder = SPScenarioBuilder(self._data,
self._variables,
process=True)
scenario_builder.load_cm(os.path.join(self._root_dir,
'cm_functions.csv'))
# G1
logging.info("G1")
population = scenario_builder.g1(self._PSize/3)
self._update_score_table(population)
# G2
logging.info("G2")
population = self._generator(population, scenario_builder.g2)
# G3
logging.info("G3")
population = self._generator(population, scenario_builder.g3)
# form ref set from database
ref_set = self._ref_set_update(self._database)
self._report(ref_set, scenario_builder)
# Leaving this here in case I change my mind TODO
# ref_set = ScatterPhenoScenarioContainer()
# ref_set.load_file(os.path.join(self._root_dir, 'ref_set.csv'),
# self._data)
self._main_loop(ref_set, scenario_builder, population)
def _run_algorithm(self):
"""Algorithm main method"""
scenario_builder = SPScenarioBuilder(self._data,
self._variables,
process=True)
# G1
logging.info("G1")
start = datetime.now()
population = scenario_builder.g1(self._PSize/3)
self._update_score_table(population)
logging.info("G1 - %s" % (datetime.now() - start))
# G2
logging.info("G2")
start = datetime.now()
population = self._generator(population, scenario_builder.g2)
logging.info("G2 - %s" % (datetime.now() - start))
# G3
start = datetime.now()
logging.info("G3")
population = self._generator(population, scenario_builder.g3)
logging.info("G3 - %s" % (datetime.now() - start))
# build ref set
logging.info("Building ref_set")
ref_set = self._ref_set_update(population)
self._report(ref_set, scenario_builder)
# parallel improvement of the best b/2 solutions
start = datetime.now()
logging.info("Improving ref_set")
ref_set = self._mp_improve(ref_set, scenario_builder)
logging.info("Improvements - %s" % (datetime.now() - start))
self._main_loop(ref_set, scenario_builder, population)
def _main_loop(self, ref_set, scenario_builder, population):
stop = False
last_changed = 0
iteration = 0
while not stop:
start_loop = datetime.now()
# create the pool from combining solutions from ref_set
logging.info("Performing combinations")
start = datetime.now()
pool = self._combine(ref_set, scenario_builder)
logging.info("Combinations %s" % (datetime.now() - start))
# improve pool
logging.info("Improving best combinations")
start = datetime.now()
pool = self._mp_improve(pool, scenario_builder)
logging.info("Improvements %s" % (datetime.now() - start))
# join ref_set and pool together
union = deepcopy(ref_set)
union.add_container(pool)
union.sort()
new_ref_set = self._ref_set_update(union)
if ref_set.same(new_ref_set):
logging.info("Ref_set not changed")
new_ref_set = ScatterPhenoScenarioContainer()
for i in range(self._b/2):
new_ref_set.add(union.get(i))
# get the most diverse solutions to what
# we already have in ref_set
while new_ref_set.len() < self._b:
new_ref_set.add(population.get_diverse(new_ref_set))
if ref_set.same(new_ref_set):
last_changed += 1
else:
last_changed = 0
if last_changed >= 5:
logging.info("Reached optimal solution, terminating...")
stop = True
if os.path.exists('/home/eey9/.stop_scatter_search'):
stop = True
logging.info("Stopping because of file flag...")
ref_set = new_ref_set
iteration += 1
logging.info("Completed iteration %d" % iteration)
self._report(ref_set, scenario_builder)
t_delta = datetime.now() - start_loop
logging.info("Iteration time %s" % t_delta)
return
def _ref_set_update(self, source):
source.sort()
ref_set = ScatterPhenoScenarioContainer()
for i in range(self._b/2):
ref_set.add(source.get(i))
# get the most diverse solutions to what we already have in ref_set
while ref_set.len() < self._b:
ref_set.add(source.get_diverse(ref_set))
return ref_set
def _combine(self, container, scenario_builder):
# build subsets
combinations = self._build_combinations(container)
pool = ScatterPhenoScenarioContainer()
for combination in combinations:
start = datetime.now()
try:
new_scenario = scenario_builder.combine(combination[0],
combination[1],
self._score_table)
except NoValidSolutionException:
logging.info("Combination %d/%d - %s: no valid solution" %
(combinations.index(combination) + 1,
len(combinations),
(datetime.now() - start)))
continue
self._update_score_table(new_scenario)
if not pool.contains(new_scenario):
pool.add(new_scenario)
# see where does the scenario qualify to be in container
try:
j = container.index(next(x for x in container.get_all()
if new_scenario.get_utility() <
x.get_utility()))
scenario_builder.success(self._b - j)
except StopIteration:
continue # Worse than anything in ref_set, does not qualify
logging.info("Combination %d/%d - %s" %
(combinations.index(combination) + 1,
len(combinations),
(datetime.now() - start)))
return pool
def _sp_improve(self, container, scenario_builder):
container.sort()
best = []
for i in range(self._b/2):
best.append(container.get(i))
result = []
for scenario in best:
result.append(self._improve(scenario, scenario_builder))
for entry in result:
index = container.index(entry['individual'])
best = entry['improvements'].get(0)
if best.get_utility() < entry['individual'].get_utility():
container.replace(best, index)
for improvement in entry['improvements'].get_all():
self._update_score_table(improvement)
logging.info("Improved %d solutions" % container.get_changes())
container.reset_changes()
return container
def _mp_improve(self, container, scenario_builder):
"""Improves b/2 best solutions from the container and updates
the score table with the generated solutions
"""
container.sort()
pool = Pool(processes=self._proc_count)
logging.info("Starting processes")
start = datetime.now()
best = []
builders = []
for i in range(self._b/2):
best.append(container.get(i))
builders.append(scenario_builder)
try:
result = pool.map(self._improve, best, builders)
pool.close()
pool.join()
except MemoryError as e:
send_email("I crashed again, please help!")
import pudb
pudb.set_trace()
print(e.message())
logging.info("Processes finished - %s" % (datetime.now() - start))
# How infuriating was that?!
# pathos was being smart and was caching pool so this is needed
# to prevent from erroring out
pool.restart()
start = datetime.now()
logging.info("mp_improve second loop")
for entry in result:
index = container.index(entry['individual'])
best = entry['improvements'].get(0)
if best.get_utility() < entry['individual'].get_utility():
container.replace(best, index)
for improvement in entry['improvements'].get_all():
self._update_score_table(improvement)
logging.info("mp_improve second loop - %s" % (datetime.now() - start))
logging.info("Improved %d solutions" % container.get_changes())
container.reset_changes()
return container
def _improve(self, individual, scenario_builder):
start = datetime.now()
base = importr("base")
candidate_list = self._build_candidate_list(individual)
improvements = ScatterPhenoScenarioContainer()
for var in candidate_list:
new_scenario = scenario_builder.flip(individual, var)
if new_scenario.same(individual) or \
not new_scenario.valid(process=True):
continue
new_scenario = self._evaluate(new_scenario, base)
if not improvements.contains(new_scenario):
improvements.add(new_scenario)
for i in range(len(individual.get_solution())):
for j in range(i + 1, len(individual.get_solution())):
new_scenario = scenario_builder.swap(individual, i, j)
if new_scenario.same(individual) or \
not new_scenario.valid(process=True):
continue
new_scenario = self._evaluate(new_scenario, base)
if not improvements.contains(new_scenario):
improvements.add(new_scenario)
if not self._database.contains(new_scenario):
self._database.add(new_scenario)
improvements.sort()
logging.info("self._improve finished - %s" %
(datetime.now() - start))
return {'individual': individual,
'improvements': improvements}
def _build_candidate_list(self, individual):
candidate_list = []
for entry in individual.get_solution():
t = next(x for x in entry.keys() if x != 'value')
candidate_list.append(next(x for x in self._score_table
if x['type'] == t and
entry[t] == x['name'] and
entry['value'] != x['value']))
# smallest score = highest probability so DONT CHANGE THIS
candidate_list.sort(key=lambda x: x['score'])
return candidate_list
def _generator(self, population, func):
generated = 0
while generated < self._PSize/3:
worked = False
while not worked:
try:
individual = func(self._score_table)
population.add(individual)
self._update_score_table(individual)
generated += 1
worked = True
except ScatterPhenoScenarioContainerException:
# already exists
pass
return population
def _evaluate(self, pheno_scenario, base=None):
if base is None:
base = glob_base
if self._database.contains(pheno_scenario):
return self._database.request(pheno_scenario)
model = ScatterPhenoModel(self._data,
base,
pheno_scenario,
self._methods,
self._max_rmse)
util = (0.3 * pheno_scenario.get_cost()) + model.get_rmse()
pheno_scenario.set_utility(util)
pheno_scenario.set_rmse(model.get_absolute_rmse())
return pheno_scenario
def _update_score_table(self, input_=None):
if input_ is None:
self._score_table = self._calc_table(self._database.get_all())
elif input_.__class__ == ScatterPhenoScenarioContainer:
# we are given a population - this should happen after G1
population = input_.get_all()
for individual in population:
if not self._database.contains(individual):
self._evaluate(individual)
self._database.add(individual)
else:
logging.info("Warning, individual in database, weird!")
# calculate score based on whole database population
self._score_table = self._calc_table(self._database.get_all())
elif input_.__class__ == ScatterPhenoScenario:
individual = input_
if self._database.contains(individual):
# individual already in database, update the individual
# with the rmse and utility
index = self._database.index(individual)
# but only if it needs updating
if not individual.has_utility():
self._database.get(index).copy_to(individual)
return
if not individual.is_evaluated():
self._evaluate(individual)
# create the table at t
new_table = self._calc_table(self._database.get_all() +
[individual])
# use the tables at t and t-1 to calculate the smoothed score
for entry, new_entry in zip(self._score_table, new_table):
entry['score'] = (self._alpha * entry['score'] +
(1 - self._alpha) * new_entry['score'])
self._database.add(individual)
def _calc_table(self, population):
new_table = []
# using self._score_table just for template here,
# none of the values will be copied
for entry in self._score_table:
new_entry = deepcopy(entry)
index = self._score_table.index(entry)/2
match = [x for x in population
if x.get(index) == entry['value']]
non_match = [x for x in population
if x.get(index) != entry['value']]
# little hack to get around certain variables not having
# both values
if len(match) == 0 or len(non_match) == 0:
score = 0.5
else:
util_match = (sum([x.get_utility() for x in match]) /
len(match))
util_non_match = (sum([x.get_utility()
for x in non_match]) /
len(non_match))
score = util_match / (util_match + util_non_match)
new_entry['score'] = score
new_table.append(new_entry)
return new_table
def _get_max_rmse(self):
rmses = dict()
for method in self._methods:
model = MLProcessModel(method, self._data, self._data,
self._variables, glob_base)
rmses[method] = model._rmse_abs
return rmses
def _build_combinations(self, container):
container.sort()
population = container.get_all()
combinations = []
for i in range(len(population)):
for j in range(i + 1, len(population)):
combination = [population[i], population[j]]
combinations.append(combination)
return combinations
def _hack_data(self, data):
# remove winter months that are useless
for key in data.keys():
new_data = [x for x in data[key]
if x[formats.DATE].month > 3 and
x[formats.DATE].month < 11]
data[key] = new_data
# remove records with missing values for needed variables
needed_vars = deepcopy(self._variables)
ml_data = []
for entry in data['ml_data']:
add = True
for key in needed_vars:
if entry[key] is None:
add = False
break
if add:
ml_data.append(entry)
data['ml_data'] = ml_data
return data
def _empty_score_table(self):
score_table = []
for month in self._months:
for val in [False, True]:
entry = dict()
entry['name'] = month
entry['type'] = 'month'
entry['value'] = val
entry['score'] = 0
score_table.append(entry)
for var in self._variables:
for val in [False, True]:
entry = dict()
entry['name'] = var
entry['type'] = 'variable'
entry['value'] = val
entry['score'] = 0
score_table.append(entry)
return score_table
def _report(self, ref_set, sb):
self._to_csv(os.path.join(self._root_dir, 'ref_set.csv'), ref_set)
CSVFileWriter(os.path.join(self._root_dir, 'score_table.csv'),
self._score_table)
self._to_csv(os.path.join(self._root_dir, 'database.csv'),
self._database)
# delete the function reference from the dict and save the info to file
func = deepcopy(sb._cm_functions)
for f in func:
del f['function']
CSVFileWriter(os.path.join(self._root_dir, 'cm_functions.csv'), func)
# report memory usage
mem_report = [{'date': datetime.now().strftime("%H:%M:%S %d/%m/%Y"),
'mem': memory()/float(1024**2),
'res_memory': res_memory(),
'total_memory': total_memory()}]
memfile = os.path.join(self._root_dir, 'memfile.csv')
if not os.path.exists(memfile):
CSVFileWriter(memfile, mem_report)
else:
CSVFileWriter(memfile, mem_report, write_mode='a')
def _to_csv(self, fname, container):
data = [x.to_dict() for x in container.get_all()]
CSVFileWriter(fname, data)