The Apache OpenNLP team is pleased to announce the release of version 1.5.3 of Apache OpenNLP.

The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text. It supports the most common NLP tasks, such as tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing, and coreference resolution.

The OpenNLP 1.5.3 binary and source distributions are available for download from our download page:

The OpenNLP library is distributed by Maven Central as well. See the Maven Dependency page for more details:

This release contains a couple of new features, improvements and bug fixes. The CLI has been improved for a better consistency. Now the tools supports extensions that can be configured from the model, including customized context generators and validators.

Additionally the release contains the following noteworthy changes:

- Porter Stemmer tool
- L-BFGS parameter estimation
- Improved documentation
- Fine-grained POSTagger evaluation report
- Improved support to load user provided feature generator and context validation classes from OSGi environment

A detailed list of the issues related to this release can be found in the release notes.

For a complete list of fixed bugs and improvements please see the RELEASE_NOTES file included in the distribution.

--The Apache OpenNLP Team