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Oríon

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Algorithms
The installation guide lists Random Search, Hyperband, TPE, and ASHA as included algorithms, with more available through plugins.orion.readthedocs.io · read 4 Oct 2026
Database backends
The documented built-in backends are EphemeralDB, file-based PickledDB, and MongoDB; MongoDB is recommended for large-scale parallel optimization above 50 workers.orion.readthedocs.io · read 11 Oct 2026
Experiment tracking
Oríon stores trials in a configured database and offers experiment versioning to track trials and their parameters for reproducibility.orion.readthedocs.io · read 11 Oct 2026
Installation
The installation guide directs users to install Oríon from PyPI with pip install orion.orion.readthedocs.io · read 11 Oct 2026
Integration
A script can report its optimization objective through Oríon’s Python client API.orion.readthedocs.io · read 4 Oct 2026
Intended users
The documentation describes Oríon as useful for machine learning researchers and engineers, while saying it is not itself a machine learning framework, pipeline, or automated machine learning product.orion.readthedocs.io · read 11 Oct 2026
License
The project documentation says Oríon is licensed under the BSD license.orion.readthedocs.io · read 4 Oct 2026
Optimization algorithms
The documentation lists Random Search, Hyperband, TPE, and ASHA as included algorithms, and supports adding algorithms through plugins.orion.readthedocs.io · read 11 Oct 2026
Parallel execution
Oríon is natively asynchronous and the documentation says it can run in parallel from a laptop to a computing farm with thousands of processors.orion.readthedocs.io · read 11 Oct 2026
Purpose
Oríon is an asynchronous framework for black-box function optimization, including hyperparameter optimization for machine learning.orion.readthedocs.io · read 11 Oct 2026
Scaling limit
The documentation says PickledDB is generally not suited to parallel optimization with more than 50 workers, though it describes this as a rule of thumb.orion.readthedocs.io · read 11 Oct 2026
Search spaces
Oríon supports search spaces defined by priors, including almost all SciPy distributions, configured through the command line or a configuration file.orion.readthedocs.io · read 11 Oct 2026
Storage
The documented database backends are in-memory EphemeralDB, file-based PickledDB, and MongoDB.orion.readthedocs.io · read 4 Oct 2026
Storage limit
The documentation says PickledDB is generally not suited to parallel optimization with more than 50 workers; MongoDB is recommended above that scale.orion.readthedocs.io · read 4 Oct 2026
Support
The project directs users to report questions, issues, bugs, or feature suggestions through its GitHub issue tracker.orion.readthedocs.io · read 11 Oct 2026
Visualization
The documentation includes experiment visualizations such as regret curves, parallel coordinates, local parameter importance, and partial dependencies.orion.readthedocs.io · read 4 Oct 2026
Workflow
It can tune command-line scripts with minimal changes to a researcher’s existing workflow.orion.readthedocs.io · read 4 Oct 2026
Workflow integration
The documentation says users can integrate Oríon into an existing workflow by calling report_objective() at the end of their script, or use its Python API.orion.readthedocs.io · read 11 Oct 2026

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