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Forecast (#162)

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* added 'forecast' task with estimators ['fbprophet', 'arima', 'sarimax']

* update setup.py

* add TimeSeriesSplit to 'regression' and 'classification' task

* add 'time' split_type for 'classification' and 'regression' task

Signed-off-by: Kevin Chen <chenkevin.8787@gmail.com>

* feature importance

* variable name

* Update test/test_split.py

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* Update test/test_forecast.py

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* prophet installation fail in windows

* upload flaml_forecast.ipynb

Signed-off-by: Kevin Chen <chenkevin.8787@gmail.com>
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14 changed files with 2613 additions and 1021 deletions
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2
.github/workflows/python-package.yml vendored
View File

@ -41,7 +41,7 @@ jobs:
- name: If linux or mac, install ray
if: (matrix.os == 'macOS-latest' || matrix.os == 'ubuntu-latest') && matrix.python-version != '3.9'
run: |
pip install -e .[ray]
pip install -e .[ray,forecast]
pip install 'tensorboardX<=2.2'
- name: Lint with flake8
run: |

160
flaml/automl.py
View File

@ -10,7 +10,7 @@ from functools import partial
import numpy as np
from scipy.sparse import issparse
from sklearn.model_selection import train_test_split, RepeatedStratifiedKFold, \
RepeatedKFold, GroupKFold
RepeatedKFold, GroupKFold, TimeSeriesSplit
from sklearn.utils import shuffle
import pandas as pd
@ -25,6 +25,7 @@ from . import tune
from .training_log import training_log_reader, training_log_writer
import logging
logger = logging.getLogger(__name__)
logger_formatter = logging.Formatter(
'[%(name)s: %(asctime)s] {%(lineno)d} %(levelname)s - %(message)s',
@ -360,11 +361,15 @@ class AutoML:
return self._trained_estimator.classes_.tolist()
return None
def predict(self, X_test):
def predict(self, X_test, freq=None):
'''Predict label from features.
Args:
X_test: A numpy array of featurized instances, shape n * m.
X_test: A numpy array of featurized instances, shape n * m,
or a pandas dataframe with one column with timestamp values
for 'forecasting' task.
freq: str or pandas offset, default=None | The frequency of the
time-series.
Returns:
A numpy array of shape n * 1 - - each element is a predicted class
@ -375,8 +380,14 @@ class AutoML:
"No estimator is trained. Please run fit with enough budget.")
return None
X_test = self._preprocess(X_test)
y_pred = self._trained_estimator.predict(X_test)
if y_pred.ndim > 1:
if self._state.task == 'forecast':
X_test_df = pd.DataFrame(X_test)
X_test_col = list(X_test.columns)[0]
X_test_df = X_test_df.rename(columns={X_test_col: 'ds'})
y_pred = self._trained_estimator.predict(X_test_df, freq=freq)
else:
y_pred = self._trained_estimator.predict(X_test)
if y_pred.ndim > 1 and isinstance(y_pred, np.ndarray):
y_pred = y_pred.flatten()
if self._label_transformer:
return self._label_transformer.inverse_transform(pd.Series(
@ -408,6 +419,25 @@ class AutoML:
def _validate_data(self, X_train_all, y_train_all, dataframe, label,
X_val=None, y_val=None):
if self._state.task == 'forecast':
if dataframe is not None and label is not None:
dataframe = dataframe.copy()
dataframe = dataframe.rename(columns={label[0]: 'ds', label[1]: 'y'})
elif dataframe is not None:
if ('ds' not in dataframe) or ('y' not in dataframe):
raise ValueError(
'For forecasting task, Dataframe must have columns "ds" and "y" '
'with the dates and values respectively.'
)
elif (X_train_all is not None) and (y_train_all is not None):
dataframe = pd.DataFrame(X_train_all)
time_col = list(dataframe.columns)[0]
dataframe = dataframe.rename(columns={time_col: 'ds'})
dataframe['y'] = pd.Series(y_train_all)
X_train_all = None
y_train_all = None
label = 'y'
if X_train_all is not None and y_train_all is not None:
if not (isinstance(X_train_all, np.ndarray) or issparse(X_train_all)
or isinstance(X_train_all, pd.DataFrame)):
@ -440,7 +470,7 @@ class AutoML:
else:
raise ValueError(
"either X_train+y_train or dataframe+label are required")
if issparse(X_train_all):
if issparse(X_train_all) or self._state.task == 'forecast':
self._transformer = self._label_transformer = False
self._X_train_all, self._y_train_all = X, y
else:
@ -482,7 +512,8 @@ class AutoML:
def _prepare_data(self,
eval_method,
split_ratio,
n_splits):
n_splits,
period=None):
X_val, y_val = self._state.X_val, self._state.y_val
if issparse(X_val):
X_val = X_val.tocsr()
@ -490,8 +521,9 @@ class AutoML:
self._X_train_all, self._y_train_all
if issparse(X_train_all):
X_train_all = X_train_all.tocsr()
if self._state.task != 'regression' and self._state.fit_kwargs.get(
'sample_weight') is None:
if (self._state.task == 'binary:logistic' or self._state.task == 'multi:softmax') \
and self._state.fit_kwargs.get('sample_weight') is None \
and self._split_type != 'time':
# logger.info(f"label {pd.unique(y_train_all)}")
label_set, counts = np.unique(y_train_all, return_counts=True)
# augment rare classes
@ -518,19 +550,21 @@ class AutoML:
count += rare_count
logger.info(
f"class {label} augmented from {rare_count} to {count}")
if 'sample_weight' in self._state.fit_kwargs:
X_train_all, y_train_all, self._state.fit_kwargs[
'sample_weight'] = shuffle(
SHUFFLE_SPLIT_TYPES = ['uniform', 'stratified']
if self._split_type in SHUFFLE_SPLIT_TYPES:
if 'sample_weight' in self._state.fit_kwargs:
X_train_all, y_train_all, self._state.fit_kwargs[
'sample_weight'] = shuffle(
X_train_all, y_train_all,
self._state.fit_kwargs['sample_weight'],
random_state=RANDOM_SEED)
elif hasattr(self._state, 'groups') and self._state.groups is not None:
X_train_all, y_train_all, self._state.groups = shuffle(
X_train_all, y_train_all, self._state.groups,
random_state=RANDOM_SEED)
else:
X_train_all, y_train_all = shuffle(
X_train_all, y_train_all, random_state=RANDOM_SEED)
elif hasattr(self._state, 'groups') and self._state.groups is not None:
X_train_all, y_train_all, self._state.groups = shuffle(
X_train_all, y_train_all, self._state.groups,
random_state=RANDOM_SEED)
else:
X_train_all, y_train_all = shuffle(
X_train_all, y_train_all, random_state=RANDOM_SEED)
if self._df:
X_train_all.reset_index(drop=True, inplace=True)
if isinstance(y_train_all, pd.Series):
@ -539,7 +573,31 @@ class AutoML:
X_train, y_train = X_train_all, y_train_all
if X_val is None:
# if eval_method = holdout, make holdout data
if self._state.task != 'regression' and eval_method == 'holdout':
if eval_method == 'holdout' and self._split_type == 'time':
if 'period' in self._state.fit_kwargs:
num_samples = X_train_all.shape[0]
split_idx = num_samples - self._state.fit_kwargs.get('period')
X_train = X_train_all[:split_idx]
y_train = y_train_all[:split_idx]
X_val = X_train_all[split_idx:]
y_val = y_train_all[split_idx:]
else:
if 'sample_weight' in self._state.fit_kwargs:
X_train, X_val, y_train, y_val, self._state.fit_kwargs[
'sample_weight'], self._state.weight_val = \
train_test_split(
X_train_all,
y_train_all,
self._state.fit_kwargs['sample_weight'],
test_size=split_ratio,
shuffle=False)
else:
X_train, X_val, y_train, y_val = train_test_split(
X_train_all,
y_train_all,
test_size=split_ratio,
shuffle=False)
elif self._state.task != 'regression' and eval_method == 'holdout':
# for classification, make sure the labels are complete in both
# training and validation data
label_set, first = np.unique(y_train_all, return_index=True)
@ -624,6 +682,13 @@ class AutoML:
f"requires input data with at least {n_splits*2} examples.")
self._state.kf = RepeatedStratifiedKFold(
n_splits=n_splits, n_repeats=1, random_state=RANDOM_SEED)
elif self._split_type == "time":
logger.info("Using TimeSeriesSplit")
if self._state.task == 'forecast':
self._state.kf = TimeSeriesSplit(
n_splits=n_splits, test_size=self._state.fit_kwargs.get('period'))
else:
self._state.kf = TimeSeriesSplit(n_splits=n_splits)
else:
logger.info("Using RepeatedKFold")
self._state.kf = RepeatedKFold(
@ -762,10 +827,15 @@ class AutoML:
if self._state.task == 'classification':
self._state.task = get_classification_objective(
len(np.unique(self._y_train_all)))
assert split_type in ["stratified", "uniform"]
assert split_type in ["stratified", "uniform", "time"]
self._split_type = split_type
else:
self._split_type = "uniform"
elif self._state.task == 'regression':
if split_type in ["uniform", "time"]:
self._split_type = split_type
else:
self._split_type = "uniform"
elif self._state.task == 'forecast':
self._split_type = "time"
if record_id >= 0:
eval_method = 'cv'
elif eval_method == 'auto':
@ -1011,15 +1081,22 @@ class AutoML:
Args:
X_train: A numpy array or a pandas dataframe of training data in
shape (n, m)
For 'forecast' task, X_train should be timestamp
y_train: A numpy array or a pandas series of labels in shape (n,)
For 'forecast' task, y_train should be value
dataframe: A dataframe of training data including label column
label: A str of the label column name
For 'forecast' task, dataframe must be specified and should
have two columns: timestamp and value
label: A str of the label column name for 'classification' or
'regression' task or a tuple of strings for timestamp and
value columns for 'forecasting' task
Note: If X_train and y_train are provided,
dataframe and label are ignored;
If not, dataframe and label must be provided.
metric: A string of the metric name or a function,
e.g., 'accuracy', 'roc_auc', 'roc_auc_ovr', 'roc_auc_ovo',
'f1', 'micro_f1', 'macro_f1', 'log_loss', 'mae', 'mse', 'r2'
'f1', 'micro_f1', 'macro_f1', 'log_loss', 'mape', 'mae', 'mse', 'r2'
for 'forecast' task, use 'mape'
if passing a customized metric function, the function needs to
have the follwing signature:
@ -1034,7 +1111,7 @@ class AutoML:
which returns a float number as the minimization objective,
and a tuple of floats or a dictionary as the metrics to log
task: A string of the task type, e.g.,
'classification', 'regression'
'classification', 'regression', 'forecast'
n_jobs: An integer of the number of threads for training
log_file_name: A string of the log file name
estimator_list: A list of strings for estimator names, or 'auto'
@ -1085,7 +1162,8 @@ class AutoML:
hyperparamter configurations for the corresponding estimators.
seed: int or None, default=None | The random seed for np.random.
**fit_kwargs: Other key word arguments to pass to fit() function of
the searched learners, such as sample_weight.
the searched learners, such as sample_weight. Include period as
a key word argument for 'forecast' task.
'''
self._start_time_flag = time.time()
self._state.task = task
@ -1093,6 +1171,7 @@ class AutoML:
self._state.fit_kwargs = fit_kwargs
self._state.weight_val = sample_weight_val
self._state.groups = groups
self._validate_data(X_train, y_train, dataframe, label, X_val, y_val)
self._search_states = {} # key: estimator name; value: SearchState
self._random = np.random.RandomState(RANDOM_SEED)
@ -1106,10 +1185,19 @@ class AutoML:
if self._state.task == 'classification':
self._state.task = get_classification_objective(
len(np.unique(self._y_train_all)))
assert split_type in ["stratified", "uniform"]
assert split_type in ["stratified", "uniform", "time"]
self._split_type = split_type
else:
self._split_type = "uniform"
elif self._state.task == 'regression':
if split_type in ["uniform", "time"]:
self._split_type = split_type
else:
self._split_type = "uniform"
elif self._state.task == 'forecast':
if split_type is not None and split_type != 'time':
raise ValueError("split_type must be 'time' when task is 'forecast'. ")
self._split_type = "time"
if self._state.task == 'forecast' and self._state.fit_kwargs.get('period') is None:
raise TypeError("missing 1 required argument for 'forecast' task: 'period'. ")
if eval_method == 'auto' or self._state.X_val is not None:
eval_method = self._decide_eval_method(time_budget)
self._state.eval_method = eval_method
@ -1122,7 +1210,11 @@ class AutoML:
self._retrain_full = retrain_full and (
eval_method == 'holdout' and self._state.X_val is None)
self._prepare_data(eval_method, split_ratio, n_splits)
if self._state.task != 'forecast':
self._prepare_data(eval_method, split_ratio, n_splits)
else:
self._prepare_data(eval_method, split_ratio, n_splits,
period=self._state.fit_kwargs.get('period'))
self._sample = sample and eval_method != 'cv' and (
MIN_SAMPLE_TRAIN * SAMPLE_MULTIPLY_FACTOR < self._state.data_size)
if 'auto' == metric:
@ -1130,6 +1222,8 @@ class AutoML:
metric = 'roc_auc'
elif 'multi' in self._state.task:
metric = 'log_loss'
elif self._state.task == 'forecast':
metric = 'mape'
else:
metric = 'r2'
self._state.metric = metric
@ -1146,6 +1240,8 @@ class AutoML:
estimator_list = ['lgbm', 'rf', 'catboost', 'xgboost', 'extra_tree']
if 'regression' != self._state.task:
estimator_list += ['lrl1']
if self._state.task == 'forecast':
estimator_list = ['fbprophet', 'arima', 'sarimax']
for estimator_name in estimator_list:
if estimator_name not in self._state.learner_classes:
self.add_learner(
@ -1237,7 +1333,7 @@ class AutoML:
elif 'bs' == self._hpo_method:
from flaml import BlendSearch as SearchAlgo
elif 'cfocat' == self._hpo_method:
from flaml import CFOCat as SearchAlgo
from flaml.searcher.cfo_cat import CFOCat as SearchAlgo
else:
raise NotImplementedError(
f"hpo_method={self._hpo_method} is not recognized. "

10
flaml/data.py
View File

@ -120,7 +120,7 @@ def get_output_from_log(filename, time_budget):
time_budget: A float of the time budget in seconds
Returns:
training_time_list: A list of the finished time of each logged iter
search_time_list: A list of the finished time of each logged iter
best_error_list:
A list of the best validation error after each logged iter
error_list: A list of the validation error of each logged iter
@ -132,9 +132,8 @@ def get_output_from_log(filename, time_budget):
best_config = None
best_learner = None
best_val_loss = float('+inf')
training_duration = 0.0
training_time_list = []
search_time_list = []
config_list = []
best_error_list = []
error_list = []
@ -143,7 +142,6 @@ def get_output_from_log(filename, time_budget):
with training_log_reader(filename) as reader:
for record in reader.records():
time_used = record.total_search_time
training_duration = time_used
val_loss = record.validation_loss
config = record.config
learner = record.learner.split('_')[0]
@ -156,7 +154,7 @@ def get_output_from_log(filename, time_budget):
best_config = config
best_learner = learner
best_config_list.append(best_config)
training_time_list.append(training_duration)
search_time_list.append(time_used)
best_error_list.append(best_val_loss)
logged_metric_list.append(train_loss)
error_list.append(val_loss)
@ -166,7 +164,7 @@ def get_output_from_log(filename, time_budget):
"Best Learner": best_learner,
"Best Hyper-parameters": best_config})
return (training_time_list, best_error_list, error_list, config_list,
return (search_time_list, best_error_list, error_list, config_list,
logged_metric_list)

38
flaml/ml.py
View File

@ -9,12 +9,12 @@ import numpy as np
import pandas as pd
from sklearn.metrics import mean_squared_error, r2_score, roc_auc_score, \
accuracy_score, mean_absolute_error, log_loss, average_precision_score, \
f1_score
from sklearn.model_selection import RepeatedStratifiedKFold, GroupKFold
f1_score, mean_absolute_percentage_error
from sklearn.model_selection import RepeatedStratifiedKFold, GroupKFold, TimeSeriesSplit
from .model import (
XGBoostEstimator, XGBoostSklearnEstimator, RandomForestEstimator,
LGBMEstimator, LRL1Classifier, LRL2Classifier, CatBoostEstimator,
ExtraTreeEstimator, KNeighborsEstimator)
ExtraTreeEstimator, KNeighborsEstimator, FBProphet, ARIMA, SARIMAX)
import logging
logger = logging.getLogger(__name__)
@ -42,6 +42,12 @@ def get_estimator_class(task, estimator_name):
estimator_class = ExtraTreeEstimator
elif 'kneighbor' == estimator_name:
estimator_class = KNeighborsEstimator
elif 'prophet' in estimator_name:
estimator_class = FBProphet
elif estimator_name == 'arima':
estimator_class = ARIMA
elif estimator_name == 'sarimax':
estimator_class = SARIMAX
else:
raise ValueError(
estimator_name + ' is not a built-in learner. '
@ -57,7 +63,7 @@ def sklearn_metric_loss_score(
Args:
metric_name: A string of the metric name, one of
'r2', 'rmse', 'mae', 'mse', 'accuracy', 'roc_auc', 'roc_auc_ovr',
'roc_auc_ovo', 'log_loss', 'f1', 'ap', 'micro_f1', 'macro_f1'
'roc_auc_ovo', 'log_loss', 'mape', 'f1', 'ap', 'micro_f1', 'macro_f1'
y_predict: A 1d or 2d numpy array of the predictions which can be
used to calculate the metric. E.g., 2d for log_loss and 1d
for others.
@ -95,6 +101,9 @@ def sklearn_metric_loss_score(
elif 'log_loss' in metric_name:
score = log_loss(
y_true, y_predict, labels=labels, sample_weight=sample_weight)
elif 'mape' in metric_name:
score = mean_absolute_percentage_error(
y_true, y_predict)
elif 'micro_f1' in metric_name:
score = 1 - f1_score(
y_true, y_predict, sample_weight=sample_weight, average='micro')
@ -111,18 +120,20 @@ def sklearn_metric_loss_score(
metric_name + ' is not a built-in metric, '
'currently built-in metrics are: '
'r2, rmse, mae, mse, accuracy, roc_auc, roc_auc_ovr, roc_auc_ovo,'
'log_loss, f1, micro_f1, macro_f1, ap. '
'log_loss, mape, f1, micro_f1, macro_f1, ap. '
'please pass a customized metric function to AutoML.fit(metric=func)')
return score
def get_y_pred(estimator, X, eval_metric, obj):
def get_y_pred(estimator, X, eval_metric, obj, freq=None):
if eval_metric in ['roc_auc', 'ap'] and 'binary' in obj:
y_pred_classes = estimator.predict_proba(X)
y_pred = y_pred_classes[
:, 1] if y_pred_classes.ndim > 1 else y_pred_classes
elif eval_metric in ['log_loss', 'roc_auc', 'roc_auc_ovr', 'roc_auc_ovo']:
y_pred = estimator.predict_proba(X)
elif eval_metric == 'mape':
y_pred = estimator.predict(X, freq=freq)
else:
y_pred = estimator.predict(X)
return y_pred
@ -201,15 +212,21 @@ def evaluate_model_CV(
valid_fold_num = total_fold_num = 0
n = kf.get_n_splits()
X_train_split, y_train_split = X_train_all, y_train_all
if task == 'regression':
labels = None
else:
if task == 'binary:logistics' or task == 'multi:softmax':
labels = np.unique(y_train_all)
else:
labels = None
if isinstance(kf, RepeatedStratifiedKFold):
kf = kf.split(X_train_split, y_train_split)
elif isinstance(kf, GroupKFold):
kf = kf.split(X_train_split, y_train_split, kf.groups)
elif isinstance(kf, TimeSeriesSplit) and task == 'forecast':
y_train_all = pd.DataFrame(y_train_all, columns=['y'])
train = X_train_all.join(y_train_all)
kf = kf.split(train)
elif isinstance(kf, TimeSeriesSplit):
kf = kf.split(X_train_split, y_train_split)
else:
kf = kf.split(X_train_split)
rng = np.random.RandomState(2020)
@ -221,7 +238,8 @@ def evaluate_model_CV(
else:
weight = weight_val = None
for train_index, val_index in kf:
train_index = rng.permutation(train_index)
if not isinstance(kf, TimeSeriesSplit):
train_index = rng.permutation(train_index)
if isinstance(X_train_all, pd.DataFrame):
X_train, X_val = X_train_split.iloc[
train_index], X_train_split.iloc[val_index]

221
flaml/model.py
View File

@ -15,6 +15,7 @@ import pandas as pd
from . import tune
import logging
logger = logging.getLogger(__name__)
@ -635,7 +636,6 @@ class LRL2Classifier(SKLearnEstimator):
class CatBoostEstimator(BaseEstimator):
_time_per_iter = None
_train_size = 0
@ -834,3 +834,222 @@ class KNeighborsEstimator(BaseEstimator):
X = X.drop(cat_columns, axis=1)
X = X.to_numpy()
return X
class FBProphet(BaseEstimator):
@classmethod
def search_space(cls, **params):
space = {
'changepoint_prior_scale': {
'domain': tune.loguniform(lower=0.001, upper=1000),
'init_value': 0.01,
'low_cost_init_value': 0.001,
},
'seasonality_prior_scale': {
'domain': tune.loguniform(lower=0.01, upper=100),
'init_value': 1,
},
'holidays_prior_scale': {
'domain': tune.loguniform(lower=0.01, upper=100),
'init_value': 1,
},
'seasonality_mode': {
'domain': tune.choice(['additive', 'multiplicative']),
'init_value': 'multiplicative',
}
}
return space
def fit(self, X_train, y_train, budget=None, **kwargs):
y_train = pd.DataFrame(y_train, columns=['y'])
train_df = X_train.join(y_train)
if ('ds' not in train_df) or ('y' not in train_df):
raise ValueError(
'Dataframe for training forecast model must have columns "ds" and "y" with the dates and '
'values respectively.'
)
if 'n_jobs' in self.params:
self.params.pop('n_jobs')
from prophet import Prophet
current_time = time.time()
model = Prophet(**self.params).fit(train_df)
train_time = time.time() - current_time
self._model = model
return train_time
def predict(self, X_test, freq=None):
if self._model is not None:
if isinstance(X_test, int) and freq is not None:
future = self._model.make_future_dataframe(periods=X_test, freq=freq)
forecast = self._model.predict(future)
elif isinstance(X_test, pd.DataFrame):
forecast = self._model.predict(X_test)
else:
raise ValueError(
"either X_test(pd.Dataframe with dates for predictions, column ds) or"
"X_test(int number of periods)+freq are required.")
return forecast['yhat']
else:
return np.ones(X_test.shape[0])
class ARIMA(BaseEstimator):
@classmethod
def search_space(cls, **params):
space = {
'p': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
},
'd': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
},
'q': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
}
}
return space
def fit(self, X_train, y_train, budget=None, **kwargs):
y_train = pd.DataFrame(y_train, columns=['y'])
train_df = X_train.join(y_train)
if ('ds' not in train_df) or ('y' not in train_df):
raise ValueError(
'Dataframe for training forecast model must have columns "ds" and "y" with the dates and '
'values respectively.'
)
train_df.index = pd.to_datetime(train_df['ds'])
train_df = train_df.drop('ds', axis=1)
if 'n_jobs' in self.params:
self.params.pop('n_jobs')
from statsmodels.tsa.arima.model import ARIMA as ARIMA_estimator
import warnings
warnings.filterwarnings("ignore")
current_time = time.time()
model = ARIMA_estimator(train_df,
order=(self.params['p'], self.params['d'], self.params['q']),
enforce_stationarity=False,
enforce_invertibility=False)
model = model.fit()
train_time = time.time() - current_time
self._model = model
return train_time
def predict(self, X_test, freq=None):
if self._model is not None:
if isinstance(X_test, int) and freq is not None:
forecast = self._model.forecast(steps=X_test).to_frame().reset_index()
elif isinstance(X_test, pd.DataFrame):
start_date = X_test.iloc[0, 0]
end_date = X_test.iloc[-1, 0]
forecast = self._model.predict(start=start_date, end=end_date)
else:
raise ValueError(
"either X_test(pd.Dataframe with dates for predictions, column ds) or"
"X_test(int number of periods)+freq are required.")
return forecast
else:
return np.ones(X_test.shape[0])
class SARIMAX(BaseEstimator):
@classmethod
def search_space(cls, **params):
space = {
'p': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
},
'd': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
},
'q': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 2,
'low_cost_init_value': 0,
},
'P': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 1,
'low_cost_init_value': 0,
},
'D': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 1,
'low_cost_init_value': 0,
},
'Q': {
'domain': tune.quniform(lower=0, upper=10, q=1),
'init_value': 1,
'low_cost_init_value': 0,
},
's': {
'domain': tune.choice([1, 4, 6, 12]),
'init_value': 12,
}
}
return space
def fit(self, X_train, y_train, budget=None, **kwargs):
y_train = pd.DataFrame(y_train, columns=['y'])
train_df = X_train.join(y_train)
if ('ds' not in train_df) or ('y' not in train_df):
raise ValueError(
'Dataframe for training forecast model must have columns "ds" and "y" with the dates and '
'values respectively.'
)
train_df.index = pd.to_datetime(train_df['ds'])
train_df = train_df.drop('ds', axis=1)
if 'n_jobs' in self.params:
self.params.pop('n_jobs')
from statsmodels.tsa.statespace.sarimax import SARIMAX as SARIMAX_estimator
current_time = time.time()
model = SARIMAX_estimator(train_df,
order=(self.params['p'], self.params['d'], self.params['q']),
seasonality_order=(self.params['P'], self.params['D'], self.params['Q'], self.params['s']),
enforce_stationarity=False,
enforce_invertibility=False)
model = model.fit()
train_time = time.time() - current_time
self._model = model
return train_time
def predict(self, X_test, freq=None):
if self._model is not None:
if isinstance(X_test, int) and freq is not None:
forecast = self._model.forecast(steps=X_test).to_frame().reset_index()
elif isinstance(X_test, pd.DataFrame):
start_date = X_test.iloc[0, 0]
end_date = X_test.iloc[-1, 0]
forecast = self._model.predict(start=start_date, end=end_date)
else:
raise ValueError(
"either X_test(pd.Dataframe with dates for predictions, column ds)"
"or X_test(int number of periods)+freq are required.")
return forecast
else:
return np.ones(X_test.shape[0])

3
flaml/searcher/blendsearch.py
View File

@ -165,7 +165,8 @@ class BlendSearch(Searcher):
min_resource, max_resource, reduction_factor, self.cost_attr, seed)
self._is_ls_ever_converged = False
self._subspace = {} # the subspace for each trial id
self._init_search()
if space:
self._init_search()
def set_search_properties(self,
metric: Optional[str] = None,

2
flaml/version.py
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@ -1 +1 @@
__version__ = "0.5.12"
__version__ = "0.5.13"

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notebook/flaml_automl.ipynb
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1089
notebook/flaml_forecast.ipynb Normal file
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notebook/flaml_lightgbm.ipynb
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5
setup.py
View File

@ -56,6 +56,7 @@ setuptools.setup(
"torch==1.8.1",
"datasets==1.4.1",
"azure-storage-blob",
"statsmodels>=0.12.2"
],
"blendsearch": [
"optuna==2.8.0"
@ -79,6 +80,10 @@ setuptools.setup(
"datasets==1.4.1",
"tensorboardX<=2.2",
"torch"
],
"forecast": [
"prophet>=1.0.1",
"statsmodels>=0.12.2"
]
},
classifiers=[

119
test/test_forecast.py Normal file
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@ -0,0 +1,119 @@
def test_forecast_automl_df(budget=5):
# using dataframe
import statsmodels.api as sm
data = sm.datasets.co2.load_pandas()
data = data.data
data = data['co2'].resample('MS').mean()
data = data.fillna(data.bfill())
data = data.to_frame().reset_index()
data = data.rename(columns={'index': 'ds', 'co2': 'y'})
num_samples = data.shape[0]
time_horizon = 12
split_idx = num_samples - time_horizon
X_train = data[:split_idx]
X_test = data[split_idx:]['ds'].to_frame()
y_test = data[split_idx:]['y'].to_frame()
''' import AutoML class from flaml package '''
from flaml import AutoML
automl = AutoML()
settings = {
"time_budget": budget, # total running time in seconds
"metric": 'mape', # primary metric
"task": 'forecast', # task type
"log_file_name": 'CO2_forecast.log', # flaml log file
"eval_method": "holdout",
"split_type": 'time'
}
'''The main flaml automl API'''
try:
automl.fit(dataframe=X_train, **settings, period=time_horizon, freq='M')
except ImportError:
automl.fit(dataframe=X_train, **settings, estimator_list=['arima', 'sarimax'], period=time_horizon, freq='M')
''' retrieve best config and best learner'''
print('Best ML leaner:', automl.best_estimator)
print('Best hyperparmeter config:', automl.best_config)
print(f'Best mape on validation data: {automl.best_loss}')
print(f'Training duration of best run: {automl.best_config_train_time}s')
print(automl.model.estimator)
''' pickle and save the automl object '''
import pickle
with open('automl.pkl', 'wb') as f:
pickle.dump(automl, f, pickle.HIGHEST_PROTOCOL)
''' compute predictions of testing dataset '''
y_pred = automl.predict(X_test)
print('Predicted labels', y_pred)
print('True labels', y_test)
''' compute different metric values on testing dataset'''
from flaml.ml import sklearn_metric_loss_score
print('mape', '=', sklearn_metric_loss_score('mape', y_pred, y_test))
from flaml.data import get_output_from_log
time_history, best_valid_loss_history, valid_loss_history, config_history, train_loss_history = \
get_output_from_log(filename=settings['log_file_name'], time_budget=budget)
for config in config_history:
print(config)
print(automl.prune_attr)
print(automl.max_resource)
print(automl.min_resource)
def test_forecast_automl_Xy(budget=5):
# using X_train and y_train
import statsmodels.api as sm
data = sm.datasets.co2.load_pandas()
data = data.data
data = data['co2'].resample('MS').mean()
data = data.fillna(data.bfill())
data = data.to_frame().reset_index()
num_samples = data.shape[0]
time_horizon = 12
split_idx = num_samples - time_horizon
X_train = data[:split_idx]['index'].to_frame()
y_train = data[:split_idx]['co2']
X_test = data[split_idx:]['index'].to_frame()
y_test = data[split_idx:]['co2'].to_frame()
''' import AutoML class from flaml package '''
from flaml import AutoML
automl = AutoML()
settings = {
"time_budget": budget, # total running time in seconds
"metric": 'mape', # primary metric
"task": 'forecast', # task type
"log_file_name": 'CO2_forecast.log', # flaml log file
"eval_method": "holdout",
"split_type": 'time'
}
'''The main flaml automl API'''
try:
automl.fit(X_train=X_train, y_train=y_train, **settings, period=time_horizon, freq='M')
except ImportError:
automl.fit(X_train=X_train, y_train=y_train, **settings, estimator_list=['arima', 'sarimax'], period=time_horizon, freq='M')
''' retrieve best config and best learner'''
print('Best ML leaner:', automl.best_estimator)
print('Best hyperparmeter config:', automl.best_config)
print(f'Best mape on validation data: {automl.best_loss}')
print(f'Training duration of best run: {automl.best_config_train_time}s')
print(automl.model.estimator)
''' pickle and save the automl object '''
import pickle
with open('automl.pkl', 'wb') as f:
pickle.dump(automl, f, pickle.HIGHEST_PROTOCOL)
''' compute predictions of testing dataset '''
y_pred = automl.predict(X_test)
print('Predicted labels', y_pred)
print('True labels', y_test)
''' compute different metric values on testing dataset'''
from flaml.ml import sklearn_metric_loss_score
print('mape', '=', sklearn_metric_loss_score('mape', y_pred, y_test))
from flaml.data import get_output_from_log
time_history, best_valid_loss_history, valid_loss_history, config_history, train_loss_history = \
get_output_from_log(filename=settings['log_file_name'], time_budget=budget)
for config in config_history:
print(config)
print(automl.prune_attr)
print(automl.max_resource)
print(automl.min_resource)
if __name__ == "__main__":
test_forecast_automl_df(60)
test_forecast_automl_Xy(60)

22
test/test_split.py
View File

@ -6,10 +6,12 @@ from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score
dataset = "credit"
dataset = "credit-g"
def _test(split_type):
from sklearn.externals._arff import ArffException
automl = AutoML()
automl_settings = {
@ -22,9 +24,17 @@ def _test(split_type):
"split_type": split_type,
}
X, y = fetch_openml(name=dataset, return_X_y=True)
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.33,
random_state=42)
try:
X, y = fetch_openml(name=dataset, return_X_y=True)
except (ArffException, ValueError):
from sklearn.datasets import load_wine
X, y = load_wine(return_X_y=True)
if split_type != 'time':
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.33,
random_state=42)
else:
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.33,
shuffle=False)
automl.fit(X_train=X_train, y_train=y_train, **automl_settings)
pred = automl.predict(X_test)
@ -37,6 +47,10 @@ def _test_uniform():
_test(split_type="uniform")
def test_time():
_test(split_type="time")
def test_groups():
from sklearn.externals._arff import ArffException
try:

52
test/tune/example.py Normal file
View File

@ -0,0 +1,52 @@
import time
def evaluation_fn(step, width, height):
return (0.1 + width * step / 100)**(-1) + height * 0.1
def easy_objective(config):
from ray import tune
# Hyperparameters
width, height = config["width"], config["height"]
for step in range(config["steps"]):
# Iterative training function - can be any arbitrary training procedure
intermediate_score = evaluation_fn(step, width, height)
# Feed the score back back to Tune.
tune.report(iterations=step, mean_loss=intermediate_score)
time.sleep(0.1)
def test_blendsearch_tune(smoke_test=True):
try:
from ray import tune
from ray.tune.suggest import ConcurrencyLimiter
from ray.tune.schedulers import AsyncHyperBandScheduler
from ray.tune.suggest.flaml import BlendSearch
except ImportError:
print('ray[tune] is not installed, skipping test')
return
algo = BlendSearch()
algo = ConcurrencyLimiter(algo, max_concurrent=4)
scheduler = AsyncHyperBandScheduler()
analysis = tune.run(
easy_objective,
metric="mean_loss",
mode="min",
search_alg=algo,
scheduler=scheduler,
num_samples=10 if smoke_test else 100,
config={
"steps": 100,
"width": tune.uniform(0, 20),
"height": tune.uniform(-100, 100),
# This is an ignored parameter.
"activation": tune.choice(["relu", "tanh"])
})
print("Best hyperparameters found were: ", analysis.best_config)
if __name__ == "__main__":
test_blendsearch_tune(False)