Auto-Sklearn Illustration

CC BY-SA 4.0 from and

Auto-sklearn provides out-of-the-box supervised machine learning. Built around the scikit-learn machine learning library, auto-sklearn automatically searches for the right learning algorithm for a new machine learning dataset and optimizes its hyperparameters. Thus, it frees the machine learning practitioner from these tedious tasks and allows her to focus on the real problem.


auto-sklearn is written in python and is a drop-in replacement for scikit-learn classifiers:

>>> import autosklearn.classification
>>> cls = autosklearn.classification.AutoSklearnClassifier()
>>>, y_train)
>>> predictions = cls.predict(X_test)


Auto-sklearn extends the idea of configuring a general machine learning framework with efficient global optimization which was introduced with Auto-WEKA. To improve generalization, auto-sklearn builds an ensemble of all models tested during the global optimization process. In order to speed up the optimization process, auto-sklearn uses meta-learning to identify similar datasets and use knowledge gathered in the past. Auto-sklearn wraps a total of 15 classification algorithms, 14 feature preprocessing algorithms and takes care about data scaling, encoding of categorical parameters and missing values.

Get auto-sklearn

Auto-sklearn is open-source and development is done on github. Please consult the manual for installation and usage instructions.


We developed auto-sklearn to participate in the ChaLearn Automatic Machine Learning Challenge. Using auto-sklearn, we won six out of 10 track in the 1st competition and the main track of the 2nd competition. You can read an overview paper by the competition organizers here.