COR Brief
Automated Machine Learning

Auto-sklearn

Automated machine learning toolkit built on scikit-learn

Updated Feb 16, 2026open-source

Automatically selects and tunes machine learning models using Bayesian optimization.

Built on top of scikit-learn, ensuring compatibility with existing Python ML workflows.

Includes meta-learning and ensemble construction to improve predictive performance.

Pricing
$0/month
Category
Automated Machine Learning
Company
AutoML.org
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01
Automatically identifies the best machine learning algorithms for your dataset.
02
Efficiently tunes hyperparameters to maximize model performance using Bayesian methods.
03
Leverages prior knowledge from previous tasks to speed up model search on new datasets.
04
Builds ensembles of top-performing models to improve accuracy and robustness.
05
Seamlessly integrates with scikit-learn pipelines and APIs for easy adoption.
06
Supports parallel processing to speed up model training and evaluation.

Rapid Prototyping of ML Models

A data scientist needs to quickly develop baseline models for a classification problem without manual tuning.

Improving Model Performance

A developer wants to optimize hyperparameters and model selection to boost predictive accuracy on tabular data.

Automating ML Workflow in Production

An ML engineer integrates Auto-sklearn into a pipeline to automate model updates with new data.

Benchmarking Algorithms on Custom Datasets

Researchers want to benchmark multiple ML algorithms on novel datasets efficiently.

1
Install Auto-sklearn
Use pip to install: pip install auto-sklearn
2
Prepare Your Dataset
Format your data as numpy arrays or pandas DataFrames compatible with scikit-learn.
3
Initialize Auto-sklearn Classifier
Import and create an AutoSklearnClassifier object with desired time limits.
4
Fit the Model
Call the fit() method with training data to start automated model search and tuning.
5
Evaluate and Use the Model
Use predict() or predict_proba() on test data and integrate the model into your pipeline.
Is Auto-sklearn suitable for deep learning tasks?
Auto-sklearn is primarily designed for classical machine learning on tabular data and does not support deep learning models like neural networks.
Can I use Auto-sklearn with non-Python environments?
Auto-sklearn is a Python library and requires a Python environment. However, models can be exported and used in other systems if compatible.
How does Auto-sklearn handle missing data?
Auto-sklearn includes preprocessing steps that can handle missing values automatically, but it is recommended to preprocess data beforehand for best results.
What are the hardware requirements for running Auto-sklearn?
Auto-sklearn can be resource-intensive depending on dataset size and time limits. A multi-core CPU and sufficient RAM are recommended for efficient operation.
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Pricing
Model: open-source
Free
$0/month
  • Full access to Auto-sklearn features
  • Community support
  • Open-source under BSD license
Assessment
Strengths
  • Open-source and free to use with permissive BSD license.
  • Strong integration with scikit-learn ecosystem.
  • Advanced Bayesian optimization and meta-learning techniques.
  • Supports ensemble learning for improved model robustness.
  • Active research community and continuous improvements.
Limitations
  • Primarily focused on tabular data; limited support for unstructured data like images or text.
  • Can be computationally expensive for very large datasets or complex tasks.
  • Requires Python programming knowledge to use effectively.
  • Documentation can be technical and challenging for beginners.