def learn(self,
from_data,
test_data=None,
callback_on_iter=None,
eval_every_x_epochs=20,
stop_training_after_seconds=None,
stop_model_building_after_seconds=None):
"""
Train and save a model (you can use this to retrain model from data)
:param from_data: (Pandas DataFrame) The data to learn from
:param test_data: (Pandas DataFrame) The data to test accuracy and learn_error from
:param callback_on_iter: This is function that can be called on every X evaluation cycle
:param eval_every_x_epochs: This is every how many epochs we want to calculate the test error and accuracy
:return: None
"""
# This is a helper function that will help us auto-determine roughly what data types are in each column
# NOTE: That this assumes the data is clean and will only return types for 'CATEGORICAL', 'NUMERIC' and 'TEXT'
def type_map(col_name):
col_pd_type = from_data[col_name].dtype
col_pd_type = str(col_pd_type)
if col_pd_type in ['int64', 'float64', 'timedelta']:
return COLUMN_DATA_TYPES.NUMERIC
elif col_pd_type in ['bool', 'category']:
return COLUMN_DATA_TYPES.CATEGORICAL
else:
# if the number of uniques is elss than 100 or less,
# than 10% of the total number of rows then keep it as categorical
unique = from_data[col_name].nunique()
if unique < 100 or unique < len(from_data[col_name]) / 10:
return COLUMN_DATA_TYPES.CATEGORICAL
# else assume its text
return COLUMN_DATA_TYPES.TEXT
# generate the configuration and set the order for the input and output columns
if self._generate_config is True:
self._input_columns = [
col for col in from_data if col not in self._output_columns
]
self.config = {
'input_features': [{
'name': col,
'type': type_map(col)
} for col in self._input_columns],
'output_features': [{
'name': col,
'type': type_map(col)
} for col in self._output_columns]
}
self.config = predictor_config_schema.validate(self.config)
logging.info('Automatically generated a configuration')
logging.info(self.config)
else:
self._output_columns = [
col['name'] for col in self.config['output_features']
]
self._input_columns = [
col['name'] for col in self.config['input_features']
]
if stop_training_after_seconds is None:
stop_training_after_seconds = round(from_data.shape[0] *
from_data.shape[1] / 5)
if stop_model_building_after_seconds is None:
stop_model_building_after_seconds = stop_training_after_seconds * 3
from_data_ds = DataSource(from_data, self.config)
if test_data is not None:
test_data_ds = DataSource(test_data, self.config)
else:
test_data_ds = from_data_ds.extractRandomSubset(0.1)
from_data_ds.training = True
mixer_class = NnMixer
mixer_params = {}
if 'mixer' in self.config:
if 'class' in self.config['mixer']:
mixer_class = self.config['mixer']['class']
if 'attrs' in self.config['mixer']:
mixer_params = self.config['mixer']['attrs']
# Initialize data sources
if len(from_data_ds) > 100:
nr_subsets = 3
else:
# Don't use k-fold cross validation for very small input sizes
nr_subsets = 1
from_data_ds.prepare_encoders()
from_data_ds.create_subsets(nr_subsets)
try:
mixer_class({}).fit_data_source(from_data_ds)
except Exception as e:
# Not all mixers might require this
# print(e)
pass
input_size = len(from_data_ds[0][0])
training_data_length = len(from_data_ds)
test_data_ds.transformer = from_data_ds.transformer
test_data_ds.encoders = from_data_ds.encoders
test_data_ds.output_weights = from_data_ds.output_weights
test_data_ds.create_subsets(nr_subsets)
if 'optimizer' in self.config:
optimizer = self.config['optimizer']()
while True:
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
# Some heuristics...
if training_time_per_iteration > input_size:
if training_time_per_iteration > min(
(training_data_length /
(4 * input_size)), 16 * input_size):
break
optimizer.total_trials = optimizer.total_trials - 1
if optimizer.total_trials < 8:
optimizer.total_trials = 8
break
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
best_parameters = optimizer.evaluate(
lambda dynamic_parameters: Predictor.evaluate_mixer(
self.config,
mixer_class,
mixer_params,
from_data_ds,
test_data_ds,
dynamic_parameters,
max_training_time=training_time_per_iteration,
max_epochs=None))
logging.info('Using hyperparameter set: ', best_parameters)
else:
best_parameters = {}
self._mixer = mixer_class(best_parameters, self.config)
for param in mixer_params:
if hasattr(self._mixer, param):
setattr(self._mixer, param, mixer_params[param])
else:
logging.warning(
'trying to set mixer param {param} but mixerclass {mixerclass} does not have such parameter'
.format(param=param, mixerclass=str(type(self._mixer))))
def callback_on_iter_w_acc(epoch, training_error, test_error,
delta_mean):
callback_on_iter(epoch, training_error, test_error, delta_mean,
self.calculate_accuracy(test_data_ds))
self._mixer.fit(
train_ds=from_data_ds,
test_ds=test_data_ds,
callback=callback_on_iter_w_acc,
stop_training_after_seconds=stop_training_after_seconds,
eval_every_x_epochs=eval_every_x_epochs)
self.train_accuracy = self.calculate_accuracy(test_data_ds)
# Train some alternative mixers
if CONFIG.HELPER_MIXERS and self.has_boosting_mixer and (
CONFIG.FORCE_HELPER_MIXERS
or len(from_data_ds) < 12 * pow(10, 3)):
try:
self._helper_mixers = self.train_helper_mixers(
from_data_ds, test_data_ds,
self._mixer.quantiles[self._mixer.quantiles_pair[0] +
1:self._mixer.quantiles_pair[1] + 1])
except Exception as e:
logging.warning(
f'Failed to train helper mixers with error: {e}')
return self
def learn(self,
from_data,
test_data=None,
callback_on_iter=None,
eval_every_x_epochs=20,
stop_training_after_seconds=None,
stop_model_building_after_seconds=None):
"""
Train and save a model (you can use this to retrain model from data)
:param from_data: (Pandas DataFrame) The data to learn from
:param test_data: (Pandas DataFrame) The data to test accuracy and learn_error from
:param callback_on_iter: This is function that can be called on every X evaluation cycle
:param eval_every_x_epochs: This is every how many epochs we want to calculate the test error and accuracy
:return: None
"""
# This is a helper function that will help us auto-determine roughly what data types are in each column
# NOTE: That this assumes the data is clean and will only return types for 'CATEGORICAL', 'NUMERIC' and 'TEXT'
def type_map(col_name):
col_pd_type = from_data[col_name].dtype
col_pd_type = str(col_pd_type)
if col_pd_type in ['int64', 'float64', 'timedelta']:
return COLUMN_DATA_TYPES.NUMERIC
elif col_pd_type in ['bool', 'category']:
return COLUMN_DATA_TYPES.CATEGORICAL
else:
# if the number of uniques is elss than 100 or less than 10% of the total number of rows then keep it as categorical
unique = from_data[col_name].nunique()
if unique < 100 or unique < len(from_data[col_name]) / 10:
return COLUMN_DATA_TYPES.CATEGORICAL
# else assume its text
return COLUMN_DATA_TYPES.TEXT
# generate the configuration and set the order for the input and output columns
if self._generate_config == True:
self._input_columns = [
col for col in from_data if col not in self._output_columns
]
self.config = {
'input_features': [{
'name': col,
'type': type_map(col)
} for col in self._input_columns],
'output_features': [{
'name': col,
'type': type_map(col)
} for col in self._output_columns]
}
logging.info('Automatically generated a configuration')
logging.info(self.config)
else:
self._output_columns = [
col['name'] for col in self.config['input_features']
]
self._input_columns = [
col['name'] for col in self.config['output_features']
]
# @TODO Make Cross Entropy Loss work with multiple outputs
if len(self.config['output_features']
) == 1 and self.config['output_features'][0]['type'] in (
COLUMN_DATA_TYPES.CATEGORICAL):
is_categorical_output = True
else:
is_categorical_output = False
if stop_training_after_seconds is None:
stop_training_after_seconds = round(from_data.shape[0] *
from_data.shape[1] / 5)
if stop_model_building_after_seconds is None:
stop_model_building_after_seconds = stop_training_after_seconds * 3
from_data_ds = DataSource(from_data, self.config)
if test_data is not None:
test_data_ds = DataSource(test_data, self.config)
else:
test_data_ds = from_data_ds.extractRandomSubset(0.1)
from_data_ds.training = True
mixer_class = NnMixer
mixer_params = {}
if 'mixer' in self.config:
if 'class' in self.config['mixer']:
mixer_class = self.config['mixer']['class']
if 'attrs' in self.config['mixer']:
mixer_params = self.config['mixer']['attrs']
# Initialize data sources
nr_subsets = 3
from_data_ds.prepare_encoders()
from_data_ds.create_subsets(nr_subsets)
try:
mixer_class({}).fit_data_source(from_data_ds)
except:
# Not all mixers might require this
pass
input_size = len(from_data_ds[0][0])
training_data_length = len(from_data_ds)
test_data_ds.transformer = from_data_ds.transformer
test_data_ds.encoders = from_data_ds.encoders
test_data_ds.output_weights = from_data_ds.output_weights
test_data_ds.create_subsets(nr_subsets)
if 'optimizer' in self.config:
optimizer = self.config['optimizer']()
while True:
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
# Some heuristics...
if training_time_per_iteration > input_size:
if training_time_per_iteration > min(
(training_data_length /
(4 * input_size)), 16 * input_size):
break
optimizer.total_trials = optimizer.total_trials - 1
if optimizer.total_trials < 8:
optimizer.total_trials = 8
break
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
best_parameters = optimizer.evaluate(
lambda dynamic_parameters: Predictor.evaluate_mixer(
mixer_class,
mixer_params,
from_data_ds,
test_data_ds,
dynamic_parameters,
is_categorical_output,
max_training_time=training_time_per_iteration,
max_epochs=None))
logging.info('Using hyperparameter set: ', best_parameters)
else:
best_parameters = {}
mixer = mixer_class(best_parameters,
is_categorical_output=is_categorical_output)
self._mixer = mixer
for param in mixer_params:
if hasattr(mixer, param):
setattr(mixer, param, mixer_params[param])
else:
logging.warning(
'trying to set mixer param {param} but mixerclass {mixerclass} does not have such parameter'
.format(param=param, mixerclass=str(type(mixer))))
started = time.time()
epoch = 0
eval_next_on_epoch = eval_every_x_epochs
stop_training = False
for subset_iteration in [1, 2]:
if stop_training:
break
for subset_id in [*from_data_ds.subsets.keys()]:
if stop_training:
break
subset_train_ds = from_data_ds.subsets[subset_id]
subset_test_ds = test_data_ds.subsets[subset_id]
lowest_error = None
last_test_error = None
last_subset_test_error = None
test_error_delta_buff = []
subset_test_error_delta_buff = []
best_model = None
#iterate over the iter_fit and see what the epoch and mixer error is
for epoch, training_error in enumerate(
mixer.iter_fit(subset_train_ds)):
logging.info(
'training iteration {iter_i}, error {error}'.format(
iter_i=epoch, error=training_error))
if epoch >= eval_next_on_epoch:
# Prime the model on each subset for a bit
if subset_iteration == 1:
break
eval_next_on_epoch += eval_every_x_epochs
test_error = mixer.error(test_data_ds)
subset_test_error = mixer.error(subset_test_ds)
if lowest_error is None or test_error < lowest_error:
lowest_error = test_error
best_model = mixer.get_model_copy()
if last_subset_test_error is None:
subset_test_error_delta_buff.append(0)
else:
subset_test_error_delta_buff.append(
last_subset_test_error - subset_test_error)
if last_test_error is None:
test_error_delta_buff.append(0)
else:
test_error_delta_buff.append(last_test_error -
test_error)
last_test_error = test_error
delta_mean = np.mean(test_error_delta_buff[-10:])
subset_delta_mean = np.mean(
subset_test_error_delta_buff[-10:])
if callback_on_iter is not None:
callback_on_iter(
epoch, training_error, test_error, delta_mean,
self.calculate_accuracy(test_data_ds))
## Stop if the model is overfitting
if delta_mean < 0 and len(test_error_delta_buff) > 9:
stop_training = True
# Stop if we're past the time limit allocated for training
if (time.time() -
started) > stop_training_after_seconds:
stop_training = True
# If the training subset is overfitting on it's associated testing subset
if subset_delta_mean < 0 and len(
subset_test_error_delta_buff) > 9:
break
if stop_training:
mixer.update_model(best_model)
self._mixer = mixer
self.train_accuracy = self.calculate_accuracy(
test_data_ds)
self.overall_certainty = mixer.overall_certainty()
if subset_id == 'full':
logging.info('Finished training model !')
else:
logging.info(
'Finished fitting on {subset_id} of {no_subsets} subset'
.format(subset_id=subset_id,
no_subsets=len(
from_data_ds.subsets.keys())))
break
self._mixer.encoders = from_data_ds.encoders
return self
def learn(self,
from_data,
test_data=None,
callback_on_iter=None,
eval_every_x_epochs=20,
stop_training_after_seconds=None,
stop_model_building_after_seconds=None):
"""
Train and save a model (you can use this to retrain model from data)
:param from_data: (Pandas DataFrame) The data to learn from
:param test_data: (Pandas DataFrame) The data to test accuracy and learn_error from
:param callback_on_iter: This is function that can be called on every X evaluation cycle
:param eval_every_x_epochs: This is every how many epochs we want to calculate the test error and accuracy
:return: None
"""
# This is a helper function that will help us auto-determine roughly what data types are in each column
# NOTE: That this assumes the data is clean and will only return types for 'CATEGORICAL', 'NUMERIC' and 'TEXT'
def type_map(col_name):
col_pd_type = from_data[col_name].dtype
col_pd_type = str(col_pd_type)
if col_pd_type in ['int64', 'float64', 'timedelta']:
return COLUMN_DATA_TYPES.NUMERIC
elif col_pd_type in ['bool', 'category']:
return COLUMN_DATA_TYPES.CATEGORICAL
else:
# if the number of uniques is elss than 100 or less,
# than 10% of the total number of rows then keep it as categorical
unique = from_data[col_name].nunique()
if unique < 100 or unique < len(from_data[col_name]) / 10:
return COLUMN_DATA_TYPES.CATEGORICAL
# else assume its text
return COLUMN_DATA_TYPES.TEXT
# generate the configuration and set the order for the input and output columns
if self._generate_config is True:
self._input_columns = [
col for col in from_data if col not in self._output_columns
]
self.config = {
'input_features': [{
'name': col,
'type': type_map(col)
} for col in self._input_columns],
'output_features': [{
'name': col,
'type': type_map(col)
} for col in self._output_columns]
}
self.config = predictor_config_schema.validate(self.config)
logging.info('Automatically generated a configuration')
logging.info(self.config)
else:
self._output_columns = [
col['name'] for col in self.config['output_features']
]
self._input_columns = [
col['name'] for col in self.config['input_features']
]
if stop_training_after_seconds is None:
stop_training_after_seconds = round(from_data.shape[0] *
from_data.shape[1] / 5)
if stop_model_building_after_seconds is None:
stop_model_building_after_seconds = stop_training_after_seconds * 3
from_data_ds = DataSource(from_data, self.config)
if test_data is not None:
test_data_ds = DataSource(test_data, self.config)
else:
test_data_ds = from_data_ds.extractRandomSubset(0.1)
from_data_ds.training = True
mixer_class = NnMixer
mixer_params = {}
if 'mixer' in self.config:
if 'class' in self.config['mixer']:
mixer_class = self.config['mixer']['class']
if 'attrs' in self.config['mixer']:
mixer_params = self.config['mixer']['attrs']
# Initialize data sources
nr_subsets = 3
from_data_ds.prepare_encoders()
from_data_ds.create_subsets(nr_subsets)
try:
mixer_class({}).fit_data_source(from_data_ds)
except Exception as e:
# Not all mixers might require this
# print(e)
pass
input_size = len(from_data_ds[0][0])
training_data_length = len(from_data_ds)
test_data_ds.transformer = from_data_ds.transformer
test_data_ds.encoders = from_data_ds.encoders
test_data_ds.output_weights = from_data_ds.output_weights
test_data_ds.create_subsets(nr_subsets)
if 'optimizer' in self.config:
optimizer = self.config['optimizer']()
while True:
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
# Some heuristics...
if training_time_per_iteration > input_size:
if training_time_per_iteration > min(
(training_data_length /
(4 * input_size)), 16 * input_size):
break
optimizer.total_trials = optimizer.total_trials - 1
if optimizer.total_trials < 8:
optimizer.total_trials = 8
break
training_time_per_iteration = stop_model_building_after_seconds / optimizer.total_trials
best_parameters = optimizer.evaluate(
lambda dynamic_parameters: Predictor.evaluate_mixer(
self.config,
mixer_class,
mixer_params,
from_data_ds,
test_data_ds,
dynamic_parameters,
max_training_time=training_time_per_iteration,
max_epochs=None))
logging.info('Using hyperparameter set: ', best_parameters)
else:
best_parameters = {}
if CONFIG.HELPER_MIXERS and self.has_boosting_mixer and (
CONFIG.FORCE_HELPER_MIXERS
or len(from_data_ds) < 12 * pow(10, 3)):
try:
self._helper_mixers = self.train_helper_mixers(
from_data_ds, test_data_ds)
except Exception as e:
logging.warning(
f'Failed to train helper mixers with error: {e}')
mixer = mixer_class(best_parameters, self.config)
self._mixer = mixer
for param in mixer_params:
if hasattr(mixer, param):
setattr(mixer, param, mixer_params[param])
else:
logging.warning(
'trying to set mixer param {param} but mixerclass {mixerclass} does not have such parameter'
.format(param=param, mixerclass=str(type(mixer))))
started = time.time()
log_reasure = time.time()
first_run = True
stop_training = False
for subset_iteration in [1, 2]:
if stop_training:
break
subset_id_arr = [*from_data_ds.subsets.keys()] # [1]
for subset_id in subset_id_arr:
started_subset = time.time()
if stop_training:
break
#subset_train_ds = from_data_ds #.subsets[subset_id]
#subset_test_ds = test_data_ds #.subsets[subset_id]
subset_train_ds = from_data_ds.subsets[subset_id]
subset_test_ds = test_data_ds.subsets[subset_id]
lowest_error = None
last_test_error = None
last_subset_test_error = None
test_error_delta_buff = []
subset_test_error_delta_buff = []
best_model = None
best_selfaware_model = None
#iterate over the iter_fit and see what the epoch and mixer error is
for epoch, training_error in enumerate(
mixer.iter_fit(subset_train_ds,
initialize=first_run,
subset_id=subset_id)):
first_run = False
# Log this every now and then so that the user knows it's running
if (int(time.time()) - log_reasure) > 30:
log_reasure = time.time()
logging.info(
f'Lightwood training, iteration {epoch}, training error {training_error}'
)
# Prime the model on each subset for a bit
if subset_iteration == 1:
break
# Once the training error is getting smaller, enable dropout to teach the network to predict without certain features
if subset_iteration > 1 and training_error < 0.4 and not from_data_ds.enable_dropout:
eval_every_x_epochs = max(1,
int(eval_every_x_epochs / 2))
logging.info('Enabled dropout !')
from_data_ds.enable_dropout = True
lowest_error = None
last_test_error = None
last_subset_test_error = None
test_error_delta_buff = []
subset_test_error_delta_buff = []
continue
# If the selfaware network isn't able to train, go back to the original network
if subset_iteration > 1 and (
np.isnan(training_error)
or np.isinf(training_error) or training_error >
pow(10, 5)) and not mixer.stop_selfaware_training:
mixer.start_selfaware_training = False
mixer.stop_selfaware_training = True
lowest_error = None
last_test_error = None
last_subset_test_error = None
test_error_delta_buff = []
subset_test_error_delta_buff = []
continue
# Once we are past the priming/warmup period, start training the selfaware network
if subset_iteration > 1 and not mixer.is_selfaware and self.config[
'mixer'][
'selfaware'] and not mixer.stop_selfaware_training and training_error < 0.35:
logging.info('Started selfaware training !')
mixer.start_selfaware_training = True
lowest_error = None
last_test_error = None
last_subset_test_error = None
test_error_delta_buff = []
subset_test_error_delta_buff = []
continue
if epoch % eval_every_x_epochs == 0:
test_error = mixer.error(test_data_ds)
subset_test_error = mixer.error(subset_test_ds,
subset_id=subset_id)
logging.info(
f'Subtest test error: {subset_test_error} on subset {subset_id}, overall test error: {test_error}'
)
if lowest_error is None or test_error < lowest_error:
lowest_error = test_error
if mixer.is_selfaware:
best_selfaware_model = mixer.get_model_copy()
else:
best_model = mixer.get_model_copy()
if last_subset_test_error is None:
pass
else:
subset_test_error_delta_buff.append(
last_subset_test_error - subset_test_error)
last_subset_test_error = subset_test_error
if last_test_error is None:
pass
else:
test_error_delta_buff.append(last_test_error -
test_error)
last_test_error = test_error
delta_mean = np.mean(test_error_delta_buff[-5:])
subset_delta_mean = np.mean(
subset_test_error_delta_buff[-5:])
if callback_on_iter is not None:
callback_on_iter(
epoch, training_error, test_error, delta_mean,
self.calculate_accuracy(test_data_ds))
## Stop if the model is overfitting
#if delta_mean <= 0 and len(test_error_delta_buff) > 4:
# stop_training = True
# Stop if we're past the time limit allocated for training
if (time.time() -
started) > stop_training_after_seconds:
stop_training = True
# If the trauining subset is overfitting on it's associated testing subset
if (subset_delta_mean <= 0
and len(subset_test_error_delta_buff) > 4
) or (time.time() - started_subset
) > stop_training_after_seconds / len(
from_data_ds.subsets.keys()):
logging.info(
'Finished fitting on {subset_id} of {no_subsets} subset'
.format(subset_id=subset_id,
no_subsets=len(
from_data_ds.subsets.keys())))
if mixer.is_selfaware:
if best_selfaware_model is not None:
mixer.update_model(best_selfaware_model)
else:
mixer.update_model(best_model)
if subset_id == subset_id_arr[-1]:
stop_training = True
elif not stop_training:
break
if stop_training:
if mixer.is_selfaware:
mixer.update_model(best_selfaware_model)
else:
mixer.update_model(best_model)
self._mixer = mixer
self.train_accuracy = self.calculate_accuracy(
test_data_ds)
self.overall_certainty = mixer.overall_certainty()
logging.info('Finished training model !')
break
self._mixer.build_confidence_normalization_data(test_data_ds)
self._mixer.encoders = from_data_ds.encoders
return self