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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 or json 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. Many Tribuo models can be exported in ONNX format for deployment in other languages, platforms or cloud services.
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. Note the model card and reproducibility
packages require Java 17, and as such are not part of the tribuo-all Maven
Central deployment.
Tutorial notebooks, including examples of Classification, Clustering,
Regression, Anomaly Detection, TensorFlow, document classification, columnar
data loading, working with externally trained models, and the configuration
system, can be found in the tutorials. These use the
IJava Jupyter notebook kernel, and work
with Java 10+, except the model card & reproducibility tutorials which require
Java 17. To convert the tutorials' code back to Java 8, in most cases simply
replace the var keyword with the appropriate types.
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 | For both classification and regression |
| Extra Trees | Tribuo | For both classification and regression |
| K-NN | Tribuo | Includes options for several parallel backends, as well as a single threaded backend |
| Neural Networks | TensorFlow | Train a neural network in TensorFlow via the 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 multi-class classification, multi-label classification and regression tasks.
Tribuo has implementations or interfaces for:
| Algorithm | Implementation | Notes |
|---|---|---|
| Linear models | Tribuo | Uses SGD and allows any gradient optimizer |
| Factorization Machines | 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.
Tribuo has a set of information theoretic feature selection algorithms which can be applied to classification tasks. Feature inputs are automatically discretised into equal width bins. At the moment this includes implementations of mutual information maximisation (MIM), Conditional Mutual Information Maximisation (CMIM), minimum Redundancy Maximum Relevancy (mRMR) and Joint Mutual Information (JMI).
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 |
| Factorization Machines | 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 two clustering algorithm implementations. We expect to implement additional algorithms over time.
| Algorithm | Implementation | Notes |
|---|---|---|
| HDBSCAN* | Tribuo | A density-based algorithm which discovers clusters and outliers |
| K-Means | Tribuo | Includes both sequential and parallel backends, and the K-Means++ initialisation algorithm |
Tribuo offers infrastructure for anomaly detection tasks. We expect to add new implementations over time.
| Algorithm | Implementation | Notes |
|---|---|---|
| One-class SVM | LibSVM | |
| One-class linear SVM | LibLinear |
Tribuo offers infrastructure for multi-label classification, along with a wrapper which converts any of Tribuo's multi-class classification algorithms into a multi-label classification algorithm. We expect to add more multi-label specific implementations over time.
| Algorithm | Implementation | Notes |
|---|---|---|
| Independent wrapper | Tribuo | Converts a multi-class classification algorithm into a multi-label one by producing a separate classifier for each label |
| Classifier Chains | Tribuo | Provides classifier chains and randomized classifier chain ensembles using any of Tribuo's multi-class classification algorithms |
| Linear models | Tribuo | Uses SGD and allows any gradient optimizer |
| Factorization Machines | Tribuo | Uses SGD and allows any gradient optimizer |
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:
Binaries are available on Maven Central, using groupId org.tribuo. To pull
all the Java 8 compatible components of Tribuo, including the bindings for
TensorFlow, ONNX Runtime and XGBoost (which are native libraries), use:
Maven:
<dependency>
<groupId>org.tribuo</groupId>
<artifactId>tribuo-all</artifactId>
<version>4.3.1</version>
<type>pom</type>
</dependency>
or from Gradle:
implementation ("org.tribuo:tribuo-all:4.3.1@pom") {
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 except for the model card and reproducibility projects which
require Java 17.
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. As of the 4.1 release these native packages all
provide x86_64 binaries for Windows, macOS and Linux. It is also possible to
compile each package for macOS ARM64 (i.e., Apple Silicon), though there are no
binaries available on Maven Central for that platform for TensorFlow or
XGBoost. As of the 4.3 release Tribuo now depends on a version of ONNX Runtime
which includes support for macOS ARM64 and Linux aarch64 platforms. When
developing on an ARM platform you can select the arm profile in Tribuo's
pom.xml to disable the native library tests.
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.
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). Note if you're building using Java 16 or
earlier the model card and reproducibility packages will be disabled.
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.
We have a discussion mailing list tribuo-devel@oss.oracle.com, archived here. We're investigating different options for real time chat, check back in the future. For bug reports, feature requests or other issues, please file a Github Issue.
Please consult the security guide for our responsible security vulnerability disclosure process.
Tribuo is licensed under the Apache 2.0 License.
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