NOpenNLP.Tools 1.9.5-beta.2

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher.
This is a prerelease version of NOpenNLP.Tools. 
dotnet add package NOpenNLP.Tools --version 1.9.5-beta.2
                    


                    

                
NuGet\Install-Package NOpenNLP.Tools -Version 1.9.5-beta.2
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="NOpenNLP.Tools" Version="1.9.5-beta.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="NOpenNLP.Tools" Version="1.9.5-beta.2" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="NOpenNLP.Tools" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add NOpenNLP.Tools --version 1.9.5-beta.2
                    


                    

                
#r "nuget: NOpenNLP.Tools, 1.9.5-beta.2"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package NOpenNLP.Tools@1.9.5-beta.2
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=NOpenNLP.Tools&version=1.9.5-beta.2&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=NOpenNLP.Tools&version=1.9.5-beta.2&prerelease
                    


                            Install as a Cake Tool

NOpenNLP.Tools

A C# port of Apache OpenNLP 1.9.5 — a machine learning toolkit for natural language processing.

This package is the port of the opennlp-tools module: inference, training, evaluation and the corpus format readers. For the command line tools, install NOpenNLP.Cli instead.

The API reference and guides are at nopennlp.github.io/nopennlp.

Usage

Targets net10.0, net8.0, and netstandard2.0. The only runtime dependency is J2N.

using NOpenNLP.Tools.Tokenize;

var tokens = SimpleTokenizer.INSTANCE.Tokenize("Hello, world!");
// ["Hello", ",", "world", "!"]

Types and members keep their upstream OpenNLP names so that the Java documentation and examples carry over directly, with .NET casing conventions applied (TokenizerME.tokenize becomes TokenizerME.Tokenize).

Models are the ones Apache OpenNLP publishes; this port loads the same binary format:

using NOpenNLP.Tools.Tokenize;

using var stream = File.OpenRead("en-token.bin");
var tokenizer = new TokenizerME(new TokenizerModel(stream));
var tokens = tokenizer.Tokenize("Dr. Smith went to Washington.");

What is included

Included Not yet ported
Tokenization, sentence detection, POS tagging eval tests
Lemmatization, chunking, name finding (NER) Morfologik addon
Language detection, document categorization brat annotator service
Maxent / Perceptron / Naive Bayes inference
Model loading and feature generation
Parsing, entity linking, word vectors
Porter and Snowball stemmers
Corpus format readers and converters
Model training, evaluation, cross validation

Note: the UIMA library (opennlp-uima upstream) will likely never be ported. There is no .NET port of UIMA (which is also not a goal of this project), and there only seems to be some casual and research interest in creating one.

Status

Work in progress. Prerelease versions may make breaking changes as the port works toward a complete 1.9.5.

Source, issues and contributing guidelines are at github.com/nopennlp/nopennlp.

Attribution

This product contains a modified C# port of Apache OpenNLP 1.9.5, specifically the opennlp-tools module. The original Java source is:

Apache OpenNLP Copyright 2017 The Apache Software Foundation

The ported source has been modified from the original: translated from Java to C#, renamed to the NOpenNLP.Tools namespace, and adapted to .NET idioms and APIs. Ported files carry the original Apache Software Foundation license header along with a note marking them as modified. See the NOTICE file in this package for details.

NOpenNLP is not affiliated with, endorsed by, or a product of The Apache Software Foundation.

License

Licensed under the Apache License, Version 2.0.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last Updated
1.9.5-beta.2 89 9/9/2026
1.9.5-beta.1 70 9/9/2026