Programming language: Java
License: Apache License 2.0
Tags: Machine Learning     Projects    
Latest version: v4.0.2

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Tribuo - A Java prediction library (v4.0)

Tribuo is a machine learning library in Java that provides multi-class classification, regression, clustering, anomaly detection and multi-label classification. Tribuo provides implementations of popular ML algorithms and also wraps other libraries to provide a unified interface. Tribuo contains all the code necessary to load, featurise and transform data. Additionally, it includes the evaluation classes for all supported prediction types. Development is led by Oracle Labs' Machine Learning Research Group; we welcome community contributions.

All trainers are configurable using the OLCUT configuration system. This allows a user to define a trainer in an xml file and repeatably build models. Example configurations for each of the supplied Trainers can be found in the config folder of each package. These configuration files can also be written in json or edn by using the appropriate OLCUT configuration dependency. Models and datasets are serializable using Java serialization.

All models and evaluations include a serializable provenance object which records the creation time of the model or evaluation, the identity of the data and any transformations applied to it, as well as the hyperparameters of the trainer. In the case of evaluations, this provenance information also includes the specific model used. Provenance information can be extracted as JSON, or serialised directly using Java serialisation. For production deployments, provenance information can be redacted and replaced with a hash to provide model tracking through an external system.

Tribuo runs on Java 8+, and we test on LTS versions of Java along with the latest release. Tribuo itself is a pure Java library and is supported on all Java platforms; however, some of our interfaces require native code and are thus supported only where there is native library support. We test on x86_64 architectures on Windows 10, macOS and Linux (RHEL/OL/CentOS 7+), as these are supported platforms for the native libraries with which we interface. If you're interested in another platform and wish to use one of the native library interfaces (ONNX Runtime, TensorFlow, and XGBoost), we recommend reaching out to the developers of those libraries.


  • [Library Architecture](docs/Architecture.md)
  • [Package Overview](docs/PackageOverview.md)
  • Javadoc
  • [Helper Programs](docs/HelperPrograms.md)
  • [Developer Documentation](docs/Internals.md)
  • [Roadmap](docs/Roadmap.md)
  • [Frequently Asked Questions](docs/FAQs.md)


Tutorial notebooks, including examples of Classification, Clustering, Regression, Anomaly Detection and the configuration system, can be found in the [tutorials](tutorials). These use the IJava Jupyter notebook kernel, and work with Java 10+. To convert the tutorials' code back to Java 8, in most cases simply replace the var keyword with the appropriate types.


General predictors

Tribuo includes implementations of several algorithms suitable for a wide range of prediction tasks:

Algorithm Implementation Notes
Bagging Tribuo Can use any Tribuo trainer as the base learner
Random Forest Tribuo Can use any Tribuo tree trainer as the base learner
K-NN Tribuo Includes options for several parallel backends, as well as a single threaded backend
Neural Networks TensorFlow Pass a TensorFlow Neural Net to a Tribuo wrapper. Models can be deployed using the ONNX interface or the TF interface

The ensembles and K-NN use a combination function to produce their output. These combiners are prediction task specific, but the ensemble & K-NN implementations are task agnostic. We provide voting and averaging combiners for classification and regression tasks.


Tribuo has implementations or interfaces for:

Algorithm Implementation Notes
Linear models Tribuo Uses SGD and allows any gradient optimizer
CART Tribuo
SVM-SGD Tribuo An implementation of the Pegasos algorithm
Adaboost.SAMME Tribuo Can use any Tribuo classification trainer as the base learner
Multinomial Naive Bayes Tribuo
Regularised Linear Models LibLinear
SVM LibSVM or LibLinear LibLinear only supports linear SVMs
Gradient Boosted Decision Trees XGBoost

Tribuo also supplies a linear chain CRF for sequence classification tasks. This CRF is trained via SGD using any of Tribuo's gradient optimizers.

To explain classifier predictions there is an implementation of the LIME algorithm. Tribuo's implementation allows the mixing of text and tabular data, along with the use of any sparse model as an explainer (e.g., regression trees, lasso etc), however it does not support images.


Tribuo's regression algorithms are multidimensional by default. Single dimensional implementations are wrapped in order to produce multidimensional output.

Algorithm Implementation Notes
Linear models Tribuo Uses SGD and allows any gradient optimizer
CART Tribuo
Lasso Tribuo Using the LARS algorithm
Elastic Net Tribuo Using the co-ordinate descent algorithm
Regularised Linear Models LibLinear
SVM LibSVM or LibLinear LibLinear only supports linear SVMs
Gradient Boosted Decision Trees XGBoost


Tribuo includes infrastructure for clustering and also supplies a single clustering algorithm implementation. We expect to implement additional algorithms over time.

Algorithm Implementation Notes
K-Means Tribuo Includes both sequential and parallel backends

Anomaly Detection

Tribuo offers infrastructure for anomaly detection tasks and a single backend implementation using LibSVM. We expect to add new implementations over time.

Algorithm Implementation Notes
One-class SVM LibSVM


In addition to our own implementations of Machine Learning algorithms, Tribuo also provides a common interface to popular ML tools on the JVM. If you're interested in contributing a new interface, open a GitHub Issue, and we can discuss how it would fit into Tribuo.

Currently we have interfaces to:

  • LibLinear - via the LibLinear-java port of the original LibLinear.
  • LibSVM - using the pure Java transformed version of the C++ implementation.
  • ONNX Runtime - via the Java API contributed by our group.
  • TensorFlow - Using the 1.14 Java API. We're participating in the Tensorflow JVM SIG, and the upcoming TensorFlow 2 Java API will support training models without Python, which we'll incorporate into Tribuo when it's released.
  • XGBoost - via the built in XGBoost4J API.


Binaries are available on Maven Central, using groupId org.tribuo. To pull all of Tribuo, including the bindings for TensorFlow, ONNX Runtime and XGBoost (which are native libraries), use:



or from Gradle:

implementation ("org.tribuo:tribuo-all:[email protected]") {
    transitive = true // for build.gradle (i.e., Groovy)
    // isTransitive = true // for build.gradle.kts (i.e., Kotlin)

The tribuo-all dependency is a pom which depends on all the Tribuo subprojects.

Most of Tribuo is pure Java and thus cross-platform, however some of the interfaces link to libraries which use native code. Those interfaces (TensorFlow, ONNX Runtime and XGBoost) only run on supported platforms for the respective published binaries, and Tribuo has no control over which binaries are supplied. If you need support for a specific platform, reach out to the maintainers of those projects.

Individual jars are published for each Tribuo module. It is preferable to depend only on the modules necessary for the specific project. This prevents your code from unnecessarily pulling in large dependencies like TensorFlow

Compiling from source

Tribuo uses Apache Maven v3.5 or higher to build. Tribuo is compatible with Java 8+, and we test on LTS versions of Java along with the latest release. To build, simply run mvn clean package. All Tribuo's dependencies should be available on Maven Central. Please file an issue for build-related issues if you're having trouble (though do check if you're missing proxy settings for Maven first, as that's a common cause of build failures, and out of our control).

Repository Layout

Development happens on the main branch, which has the version number of the next Tribuo release with "-SNAPSHOT" appended to it. Tribuo major and minor releases will be tagged on the main branch, and then have a branch named vA.B.X-release-branch (for release vA.B.0) branched from the tagged release commit for any point releases (i.e., vA.B.1, vA.B.2 etc) following from that major/minor release. Those point releases are tagged on the specific release branch e.g., v4.0.2 is tagged on the v4.0.X-release-branch.


We welcome contributions! See our [contribution guidelines](./CONTRIBUTING.md).

We have a discussion mailing list [email protected], archived here. We're investigating different options for real time chat, check back in the near future. For bug reports, feature requests or other issues, please file a Github Issue.

Security issues should follow our [reporting guidelines](./SECURITY.md).


Tribuo is licensed under the [Apache 2.0 License](./LICENSE.txt).

Release Notes:

  • v4.0.2 - Many bug fixes (CSVDataSource, JsonDataSource, RowProcessor, LibSVMTrainer, Evaluations, Regressor serialization). Improved javadoc and documentation. Added two new tutorials (columnar data and external models).
  • v4.0.1 - Bugfix for CSVReader to cope with blank lines, added IDXDataSource to allow loading of native MNIST format data.
  • v4.0.0 - Initial public release.
  • v3 - Added provenance system, the external model support and onnx integrations.
  • v2 - Expanded beyond a classification system, to support regression, clustering and multi-label classification.
  • v1 - Initial internal release. This release only supported multi-class classification.

*Note that all licence references and agreements mentioned in the Tribuo README section above are relevant to that project's source code only.