def finetune(self, train, valid, mini_batch=50, parallelism=0, valid_iters=10, measure=None,
stops=None, optimizer_params=None, reproducible=False, keep_best=False):
"""
Ajuste fino con aprendizaje supervisado de la red neuronal, cuyos parámetros fueron inicializados mediante
el pre-entrenamiento de los autoencoders.
.. note:: Dado que esta función es una sobrecarga del método original
:func:`~learninspy.core.model.NeuralNetwork.fit`, se puede remitir a la documentación
de esta última para conocer el significado de los parámetros.
"""
list_layers = copy.deepcopy(self.list_layers)
list_layers[:-1] = map(lambda ae: ae.encoder_layer(), list_layers[:-1]) # Tomo solo la capa de encoder de cada ae
list_layers[-1] = list_layers[-1].list_layers[0] # Agarro la primer capa de la red que se genero para la salida
nn = NeuralNetwork(self.params, list_layers=list_layers)
hits_valid = nn.fit(train, valid, mini_batch=mini_batch, parallelism=parallelism,
valid_iters=valid_iters, measure=measure, stops=stops, keep_best=keep_best,
optimizer_params=optimizer_params, reproducible=reproducible)
for l in xrange(len(self.list_layers) - 1):
# Copio capa con ajuste fino al autoencoder
self.list_layers[l].list_layers[0] = nn.list_layers[l] # TODO mejorar esto, para que sea mas legible
self.list_layers[-1].list_layers[0] = nn.list_layers[-1]
# Copio los resultados de evaluación también (sobrescribir en lugar de guardar dos listas más)
self.hits_train = nn.hits_train
self.hits_valid = nn.hits_valid
self.epochs = nn.epochs
return hits_valid
def __init__(self, params, list_layers=None, dropout=None):
self.params = params
self.num_layers = len(params.units_layers)
if dropout is None:
dropout = [0.0] * self.num_layers
self.dropout = dropout
NeuralNetwork.__init__(self, params, list_layers=None)
self._init_autoencoders() # Creo autoencoders que se guardan en list_layers
def __init__(self, params, list_layers=None, dropout=None):
self.params = params
self.num_layers = len(params.units_layers)
if dropout is None:
dropout = [0.0] * self.num_layers
self.dropout = dropout
NeuralNetwork.__init__(self, params, list_layers=None)
self._init_autoencoders(
) # Creo autoencoders que se guardan en list_layers
class TestOptimizer(object):
def __init__(self, opt_params=None):
logger.info("Testeo de Optimizer con datos de Iris")
# Datos
logger.info("Cargando datos...")
data = load_iris()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.train = self.train.collect()
self.valid = self.valid.collect()
self.test = self.test.collect()
# Configuracion de optimizacion
if opt_params is None: # Por defecto, se utiliza Adadelta
stops = [criterion['MaxIterations'](10),
criterion['AchieveTolerance'](0.95, key='hits')]
options = {'step-rate': 1.0, 'decay': 0.99, 'momentum': 0.3, 'offset': 1e-8}
opt_params = OptimizerParameters(algorithm='Adadelta', stops=stops,
options=options, merge_criter='w_avg')
self.opt_params = opt_params
# Configuracion de modelo
net_params = NetworkParameters(units_layers=[4, 10, 3], activation='ReLU', strength_l1=1e-5, strength_l2=3e-4,
dropout_ratios=[0.2, 0.0], classification=True)
self.model = NeuralNetwork(net_params)
def _optimize(self, stops=None, mini_batch=30, keep_best=True):
if stops is None:
stops = [criterion['MaxIterations'](50),
criterion['AchieveTolerance'](0.95, key='hits')]
logger.info("Entrenando modelo...")
if keep_best is True:
best_valid = 0.0
best_model = None
epoch = 0
hits_valid = 0.0
while self.model.check_stop(epoch, stops) is False:
hits_train = optimize(self.model, self.train, params=self.opt_params, mini_batch=mini_batch, seed=123)
hits_valid = self.model.evaluate(self.valid, predictions=False, measure='F-measure')
if keep_best is True:
if hits_valid >= best_valid:
best_valid = hits_valid
best_model = self.model
epoch += 1
if keep_best is True:
if best_model is not None: # Si hubo algun best model, procedo con el reemplazo
self.model = copy.deepcopy(best_model)
return hits_valid
def test_optimization(self, stops=None, mini_batch=30, keep_best=True):
hits_valid = self._optimize(stops=stops, mini_batch=mini_batch, keep_best=keep_best)
logger.info("Asegurando salidas correctas...")
assert hits_valid > 0.8
hits_test = self.model.evaluate(self.test, predictions=False, measure='F-measure')
assert hits_test > 0.8
logger.info("OK")
def __init__(self, params=None, list_layers=None, dropout_in=0.0):
# Aseguro algunos parametros
params.classification = False
n_in = params.units_layers[0]
params.layer_distributed.append(False) # Ya que se agrega una dimension, se debe reflejar aqui tmb (False por ahora)
params.units_layers.append(n_in) # Unidades en la salida en igual cantidad que la entrada
params.dropout_ratios = [dropout_in, 0.0] # Dropout en encoder, pero nulo en decoder
self.num_layers = 2
NeuralNetwork.__init__(self, params, list_layers)
def __init__(self, params=None, list_layers=None, dropout_in=0.0):
# Aseguro algunos parametros
params.classification = False
n_in = params.units_layers[0]
params.layer_distributed.append(
False
) # Ya que se agrega una dimension, se debe reflejar aqui tmb (False por ahora)
params.units_layers.append(
n_in) # Unidades en la salida en igual cantidad que la entrada
params.dropout_ratios = [dropout_in, 0.0
] # Dropout en encoder, pero nulo en decoder
self.num_layers = 2
NeuralNetwork.__init__(self, params, list_layers)
def _init_autoencoders(self):
"""
Inicialización de los parámetros de cada autoencoder que conforman esta red.
:return:
"""
for l in xrange(self.num_layers - 1):
# Genero nueva estructura de parametros acorde al Autoencoder a crear
params = NetworkParameters(
self.params.units_layers[l:l + 2],
activation=self.params.activation[l],
layer_distributed=self.params.layer_distributed,
dropout_ratios=None,
classification=False,
strength_l1=self.params.strength_l1,
strength_l2=self.params.strength_l2)
self.list_layers[l] = AutoEncoder(params=params,
dropout_in=self.dropout[l])
# Configuro y creo la capa de salida (clasificación o regresión)
params = NetworkParameters(
self.params.units_layers[-2:],
activation=self.params.activation,
layer_distributed=self.params.layer_distributed,
dropout_ratios=[0.0], # en salida no debe haber DropOut
classification=self.params.classification,
strength_l1=self.params.strength_l1,
strength_l2=self.params.strength_l2)
self.list_layers[-1] = NeuralNetwork(params=params)
def finetune(self,
train,
valid,
mini_batch=50,
parallelism=0,
valid_iters=10,
measure=None,
stops=None,
optimizer_params=None,
reproducible=False,
keep_best=False):
"""
Ajuste fino con aprendizaje supervisado de la red neuronal, cuyos parámetros fueron inicializados mediante
el pre-entrenamiento de los autoencoders.
.. note:: Dado que esta función es una sobrecarga del método original
:func:`~learninspy.core.model.NeuralNetwork.fit`, se puede remitir a la documentación
de esta última para conocer el significado de los parámetros.
"""
list_layers = copy.deepcopy(self.list_layers)
list_layers[:-1] = map(
lambda ae: ae.encoder_layer(),
list_layers[:-1]) # Tomo solo la capa de encoder de cada ae
list_layers[-1] = list_layers[-1].list_layers[
0] # Agarro la primer capa de la red que se genero para la salida
nn = NeuralNetwork(self.params, list_layers=list_layers)
hits_valid = nn.fit(train,
valid,
mini_batch=mini_batch,
parallelism=parallelism,
valid_iters=valid_iters,
measure=measure,
stops=stops,
keep_best=keep_best,
optimizer_params=optimizer_params,
reproducible=reproducible)
for l in xrange(len(self.list_layers) - 1):
# Copio capa con ajuste fino al autoencoder
self.list_layers[l].list_layers[0] = nn.list_layers[
l] # TODO mejorar esto, para que sea mas legible
self.list_layers[-1].list_layers[0] = nn.list_layers[-1]
# Copio los resultados de evaluación también (sobrescribir en lugar de guardar dos listas más)
self.hits_train = nn.hits_train
self.hits_valid = nn.hits_valid
self.epochs = nn.epochs
return hits_valid
def test_fileio_model(self):
# Save
model_name = 'test_model.lea'
self.model.save(filename=TEMP_PATH+model_name)
# Load
test_model = NeuralNetwork.load(filename=TEMP_PATH+model_name)
assert self.model.params == test_model.params
def test_fileio_model(self):
# Save
model_name = 'test_model.lea'
self.model.save(filename=TEMP_PATH + model_name)
# Load
test_model = NeuralNetwork.load(filename=TEMP_PATH + model_name)
assert self.model.params == test_model.params
def test_mix_models():
# Dado que esta funcion se llama en una transformación de RDD, no es rastreada por Python
# por lo que es mejor hacerle unittest de forma que sea trazada en el coverage code.
# Configuracion de modelo
net_params = NetworkParameters(units_layers=[4, 10, 3], activation='ReLU', strength_l1=1e-5, strength_l2=3e-4,
dropout_ratios=[0.2, 0.0], classification=True)
model = NeuralNetwork(net_params)
mixed_layers = mix_models(model.list_layers, model.list_layers)
for l in xrange(len(mixed_layers)):
assert mixed_layers[l] == model.list_layers[l] * 2 # A + A = 2A
def __init__(self, network_params=None):
logger.info(
"Testeo de NeuralNetwork con datos de Combined Cycle Power Plant")
# Datos
logger.info("Cargando datos...")
data = load_ccpp()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Modelo
if network_params is None:
network_params = NetworkParameters(units_layers=[4, 30, 1],
activation='ReLU',
classification=False,
seed=123)
self.model = NeuralNetwork(network_params)
# Seteo a mano
self.model.set_l1(5e-7)
self.model.set_l2(3e-4)
self.model.set_dropout_ratios([0.0, 0.0])
def __init__(self, opt_params=None):
logger.info("Testeo de Optimizer con datos de Iris")
# Datos
logger.info("Cargando datos...")
data = load_iris()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.train = self.train.collect()
self.valid = self.valid.collect()
self.test = self.test.collect()
# Configuracion de optimizacion
if opt_params is None: # Por defecto, se utiliza Adadelta
stops = [criterion['MaxIterations'](10),
criterion['AchieveTolerance'](0.95, key='hits')]
options = {'step-rate': 1.0, 'decay': 0.99, 'momentum': 0.3, 'offset': 1e-8}
opt_params = OptimizerParameters(algorithm='Adadelta', stops=stops,
options=options, merge_criter='w_avg')
self.opt_params = opt_params
# Configuracion de modelo
net_params = NetworkParameters(units_layers=[4, 10, 3], activation='ReLU', strength_l1=1e-5, strength_l2=3e-4,
dropout_ratios=[0.2, 0.0], classification=True)
self.model = NeuralNetwork(net_params)
def __init__(self, network_params=None):
logger.info("Testeo de NeuralNetwork con datos de Combined Cycle Power Plant")
# Datos
logger.info("Cargando datos...")
data = load_ccpp()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Modelo
if network_params is None:
network_params = NetworkParameters(units_layers=[4, 30, 1], activation='ReLU',
classification=False, seed=123)
self.model = NeuralNetwork(network_params)
# Seteo a mano
self.model.set_l1(5e-7)
self.model.set_l2(3e-4)
self.model.set_dropout_ratios([0.0, 0.0])
class TestNeuralNetwork(object):
def __init__(self, network_params=None):
logger.info(
"Testeo de NeuralNetwork con datos de Combined Cycle Power Plant")
# Datos
logger.info("Cargando datos...")
data = load_ccpp()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Modelo
if network_params is None:
network_params = NetworkParameters(units_layers=[4, 30, 1],
activation='ReLU',
classification=False,
seed=123)
self.model = NeuralNetwork(network_params)
# Seteo a mano
self.model.set_l1(5e-7)
self.model.set_l2(3e-4)
self.model.set_dropout_ratios([0.0, 0.0])
def _fit(self, opt_params=None, stops=None, mini_batch=30, parallelism=2):
if opt_params is None:
options = {
'step-rate': 1.0,
'decay': 0.995,
'momentum': 0.3,
'offset': 1e-8
}
opt_params = OptimizerParameters(algorithm='Adadelta',
options=options)
if stops is None:
stops = [
criterion['MaxIterations'](30),
criterion['AchieveTolerance'](0.95, key='hits')
]
logger.info("Entrenando modelo...")
hits_valid = self.model.fit(self.train,
self.valid,
valid_iters=5,
mini_batch=mini_batch,
parallelism=parallelism,
stops=stops,
optimizer_params=opt_params,
keep_best=True,
reproducible=True)
return hits_valid
def test_check_stops(self):
criterions = [
criterion['MaxIterations'](30),
criterion['AchieveTolerance'](0.95, key='hits')
]
self.model.hits_valid = [
0.95
] # Hard-coded para simular dichos hits en el fit
assert self.model.check_stop(
epochs=15, criterions=criterions, check_all=False) is True
assert self.model.check_stop(
epochs=15, criterions=criterions, check_all=True) is False
assert self.model.check_stop(
epochs=40, criterions=criterions, check_all=True) is True
def _test_backprop(self, x, y):
# Dado que esta funcion se llama en una transformación de RDD, no es rastreada por Python
# por lo que es mejor hacerle unittest de forma que sea trazada en el coverage code.
cost, (nabla_w, nabla_b) = self.model._backprop(x, y)
assert type(cost) is float or isinstance(cost, np.float)
assert type(nabla_w[0]) is LocalNeurons
assert type(nabla_b[0]) is LocalNeurons
def test_fitting(self, opt_params=None, stops=None, mini_batch=30):
logger.info("Testeando backpropagation en NeuralNetwork...")
x = self.valid[0].features
y = [self.valid[0].label]
self._test_backprop(x, y)
hits_valid = self._fit(opt_params=opt_params,
stops=stops,
mini_batch=mini_batch)
logger.info("Asegurando salidas correctas...")
assert hits_valid > 0.7
hits_test, pred_test = self.model.evaluate(self.test,
predictions=True,
measure='R2')
assert hits_test > 0.7
logger.info("OK")
logger.info("Testeando funciones de prediccion...")
predicts = self.model.predict(self.test.collect())
assert np.array_equiv(pred_test, predicts)
# Test plot of fitting
logger.info("Testeando plots de fitting...")
plot_fitting(self.model, show=False)
logger.info("OK")
return
def test_parallelism(self, mini_batch=10):
logger.info("Testeando variantes del nivel de paralelismo...")
# Datos
logger.info("Datos utilizados: Iris")
data = load_iris()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Optimizacion
options = {
'step-rate': 1.0,
'decay': 0.995,
'momentum': 0.3,
'offset': 1e-8
}
opt_params = OptimizerParameters(algorithm='Adadelta', options=options)
stops = [criterion['MaxIterations'](10)]
# Niveles de paralelismo
parallelism = [-1, 0, 2]
for p in parallelism:
logger.info("Seteando paralelismo en %i", p)
hits_valid = self._fit(opt_params=opt_params,
stops=stops,
mini_batch=mini_batch,
parallelism=p)
logger.info("Asegurando salidas correctas...")
assert hits_valid > 0.7
hits_test, pred_test = self.model.evaluate(self.test,
predictions=True,
measure='R2')
assert hits_test > 0.7
logger.info("OK")
return
def test_plotting(self):
logger.info("Testeando plots de activaciones...")
plot_activations(self.model.params, show=False)
logger.info("OK")
logger.info("Testeando plots de neuronas...")
plot_neurons(self.model, show=False)
logger.info("OK")
return
def test_fileio_model(self):
# Save
model_name = 'test_model.lea'
self.model.save(filename=TEMP_PATH + model_name)
# Load
test_model = NeuralNetwork.load(filename=TEMP_PATH + model_name)
assert self.model.params == test_model.params
criterion['AchieveTolerance'](0.95, key='hits')]
global_stops = [criterion['MaxIterations'](20),
criterion['AchieveTolerance'](0.95, key='hits')]
options = {'step-rate': 1.0, 'decay': 0.995, 'momentum': 0.7, 'offset': 1e-8}
optimizer_params = OptimizerParameters(algorithm='Adadelta', stops=local_stops, options=options,
merge_criter='w_avg', merge_goal='cost')
logger.info("Optimizacion utilizada: %s", os.linesep+str(optimizer_params))
logger.info("Configuracion usada: %s", os.linesep+str(net_params))
# -- 3) Construcción y ajuste de red neuronal
neural_net = NeuralNetwork(net_params)
logger.info("Entrenando red neuronal ...")
hits_valid = neural_net.fit(train, valid, valid_iters=1, mini_batch=20, parallelism=0,
stops=global_stops, optimizer_params=optimizer_params, measure='R2',
keep_best=True, reproducible=False)
hits_test, predict = neural_net.evaluate(test, predictions=True)
logger.info("Hits en test: %12.11f", hits_test)
# --4) Evaluacion de desempeño
logger.info("Metricas de evaluación en clasificacion: ")
labels = map(lambda lp: float(lp.label), test.collect())
metrics = RegressionMetrics(zip(predict, labels))
print "MSE: ", metrics.mse()
]
options = {'step-rate': 1.0, 'decay': 0.995, 'momentum': 0.7, 'offset': 1e-8}
optimizer_params = OptimizerParameters(algorithm='Adadelta',
stops=local_stops,
options=options,
merge_criter='w_avg',
merge_goal='cost')
logger.info("Optimizacion utilizada: %s", os.linesep + str(optimizer_params))
logger.info("Configuracion usada: %s", os.linesep + str(net_params))
# -- 3) Construcción y ajuste de red neuronal
neural_net = NeuralNetwork(net_params)
logger.info("Entrenando red neuronal ...")
hits_valid = neural_net.fit(train,
valid,
valid_iters=1,
mini_batch=20,
parallelism=0,
stops=global_stops,
optimizer_params=optimizer_params,
measure='R2',
keep_best=True,
reproducible=False)
hits_test, predict = neural_net.evaluate(test, predictions=True)
logger.info("Hits en test: %12.11f", hits_test)
class TestNeuralNetwork(object):
def __init__(self, network_params=None):
logger.info("Testeo de NeuralNetwork con datos de Combined Cycle Power Plant")
# Datos
logger.info("Cargando datos...")
data = load_ccpp()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Modelo
if network_params is None:
network_params = NetworkParameters(units_layers=[4, 30, 1], activation='ReLU',
classification=False, seed=123)
self.model = NeuralNetwork(network_params)
# Seteo a mano
self.model.set_l1(5e-7)
self.model.set_l2(3e-4)
self.model.set_dropout_ratios([0.0, 0.0])
def _fit(self, opt_params=None, stops=None, mini_batch=30, parallelism=2):
if opt_params is None:
options = {'step-rate': 1.0, 'decay': 0.995, 'momentum': 0.3, 'offset': 1e-8}
opt_params = OptimizerParameters(algorithm='Adadelta', options=options)
if stops is None:
stops = [criterion['MaxIterations'](30),
criterion['AchieveTolerance'](0.95, key='hits')]
logger.info("Entrenando modelo...")
hits_valid = self.model.fit(self.train, self.valid, valid_iters=5, mini_batch=mini_batch,
parallelism=parallelism, stops=stops,optimizer_params=opt_params,
keep_best=True, reproducible=True)
return hits_valid
def test_check_stops(self):
criterions = [criterion['MaxIterations'](30),
criterion['AchieveTolerance'](0.95, key='hits')]
self.model.hits_valid = [0.95] # Hard-coded para simular dichos hits en el fit
assert self.model.check_stop(epochs=15, criterions=criterions, check_all=False) is True
assert self.model.check_stop(epochs=15, criterions=criterions, check_all=True) is False
assert self.model.check_stop(epochs=40, criterions=criterions, check_all=True) is True
def _test_backprop(self, x, y):
# Dado que esta funcion se llama en una transformación de RDD, no es rastreada por Python
# por lo que es mejor hacerle unittest de forma que sea trazada en el coverage code.
cost, (nabla_w, nabla_b) = self.model._backprop(x, y)
assert type(cost) is float or isinstance(cost, np.float)
assert type(nabla_w[0]) is LocalNeurons
assert type(nabla_b[0]) is LocalNeurons
def test_fitting(self, opt_params=None, stops=None, mini_batch=30):
logger.info("Testeando backpropagation en NeuralNetwork...")
x = self.valid[0].features
y = [self.valid[0].label]
self._test_backprop(x, y)
hits_valid = self._fit(opt_params=opt_params, stops=stops, mini_batch=mini_batch)
logger.info("Asegurando salidas correctas...")
assert hits_valid > 0.7
hits_test, pred_test = self.model.evaluate(self.test, predictions=True, measure='R2')
assert hits_test > 0.7
logger.info("OK")
logger.info("Testeando funciones de prediccion...")
predicts = self.model.predict(self.test.collect())
assert np.array_equiv(pred_test, predicts)
# Test plot of fitting
logger.info("Testeando plots de fitting...")
plot_fitting(self.model, show=False)
logger.info("OK")
return
def test_parallelism(self, mini_batch=10):
logger.info("Testeando variantes del nivel de paralelismo...")
# Datos
logger.info("Datos utilizados: Iris")
data = load_iris()
dataset = LocalLabeledDataSet(data)
self.train, self.valid, self.test = dataset.split_data([.5, .3, .2])
self.valid = self.valid.collect()
# Optimizacion
options = {'step-rate': 1.0, 'decay': 0.995, 'momentum': 0.3, 'offset': 1e-8}
opt_params = OptimizerParameters(algorithm='Adadelta', options=options)
stops = [criterion['MaxIterations'](10)]
# Niveles de paralelismo
parallelism = [-1, 0, 2]
for p in parallelism:
logger.info("Seteando paralelismo en %i", p)
hits_valid = self._fit(opt_params=opt_params, stops=stops, mini_batch=mini_batch, parallelism=p)
logger.info("Asegurando salidas correctas...")
assert hits_valid > 0.7
hits_test, pred_test = self.model.evaluate(self.test, predictions=True, measure='R2')
assert hits_test > 0.7
logger.info("OK")
return
def test_plotting(self):
logger.info("Testeando plots de activaciones...")
plot_activations(self.model.params, show=False)
logger.info("OK")
logger.info("Testeando plots de neuronas...")
plot_neurons(self.model, show=False)
logger.info("OK")
return
def test_fileio_model(self):
# Save
model_name = 'test_model.lea'
self.model.save(filename=TEMP_PATH+model_name)
# Load
test_model = NeuralNetwork.load(filename=TEMP_PATH+model_name)
assert self.model.params == test_model.params
