Note
Click here to download the full example code or to run this example in your browser via Binder
Tabular Regression¶
The following example shows how to fit a sample regression model with AutoPyTorch
import os
import tempfile as tmp
import warnings
import sklearn.datasets
import sklearn.model_selection
os.environ['JOBLIB_TEMP_FOLDER'] = tmp.gettempdir()
os.environ['OMP_NUM_THREADS'] = '1'
os.environ['OPENBLAS_NUM_THREADS'] = '1'
os.environ['MKL_NUM_THREADS'] = '1'
warnings.simplefilter(action='ignore', category=UserWarning)
warnings.simplefilter(action='ignore', category=FutureWarning)
from autoPyTorch.api.tabular_regression import TabularRegressionTask
Data Loading¶
X, y = sklearn.datasets.fetch_openml(name='boston', return_X_y=True, as_frame=True)
X_train, X_test, y_train, y_test = sklearn.model_selection.train_test_split(
X,
y,
random_state=1,
)
Build and fit a regressor¶
api = TabularRegressionTask()
Search for an ensemble of machine learning algorithms¶
api.search(
X_train=X_train,
y_train=y_train,
X_test=X_test.copy(),
y_test=y_test.copy(),
optimize_metric='r2',
total_walltime_limit=300,
func_eval_time_limit_secs=50,
dataset_name="Boston"
)
<autoPyTorch.api.tabular_regression.TabularRegressionTask object at 0x7f9b36e8d220>
Print the final ensemble performance before refit¶
y_pred = api.predict(X_test)
score = api.score(y_pred, y_test)
print(score)
# Print statistics from search
print(api.sprint_statistics())
{'r2': 0.9407884171054208}
autoPyTorch results:
Dataset name: Boston
Optimisation Metric: r2
Best validation score: 0.8670098636440993
Number of target algorithm runs: 23
Number of successful target algorithm runs: 22
Number of crashed target algorithm runs: 0
Number of target algorithms that exceeded the time limit: 1
Number of target algorithms that exceeded the memory limit: 0
Refit the models on the full dataset.¶
api.refit(
X_train=X_train,
y_train=y_train,
X_test=X_test,
y_test=y_test,
dataset_name="Boston",
total_walltime_limit=500,
run_time_limit_secs=50
# you can change the resampling strategy to
# for example, CrossValTypes.k_fold_cross_validation
# to fit k fold models and have a voting classifier
# resampling_strategy=CrossValTypes.k_fold_cross_validation
)
<autoPyTorch.api.tabular_regression.TabularRegressionTask object at 0x7f9b36e8d220>
Print the final ensemble performance after refit¶
y_pred = api.predict(X_test)
score = api.score(y_pred, y_test)
print(score)
# Print the final ensemble built by AutoPyTorch
print(api.show_models())
{'r2': 0.9378277102071694}
| | Preprocessing | Estimator | Weight |
|---:|:-------------------------------------------------------------------------------------------------|:----------------------------------------------------------------|---------:|
| 0 | None | CBLearner | 0.44 |
| 1 | SimpleImputer,Variance Threshold,NoCoalescer,OneHotEncoder,StandardScaler,NoFeaturePreprocessing | no embedding,ShapedMLPBackbone,FullyConnectedHead,nn.Sequential | 0.42 |
| 2 | SimpleImputer,Variance Threshold,NoCoalescer,OneHotEncoder,StandardScaler,NoFeaturePreprocessing | no embedding,ShapedMLPBackbone,FullyConnectedHead,nn.Sequential | 0.1 |
| 3 | None | LGBMLearner | 0.04 |
Total running time of the script: ( 6 minutes 52.064 seconds)