Faiss.NET.Native 1.0.0-preview.1

This is a prerelease version of Faiss.NET.Native.
There is a newer prerelease version of this package available.
See the version list below for details. 
dotnet add package Faiss.NET.Native --version 1.0.0-preview.1
                    


                    

                
NuGet\Install-Package Faiss.NET.Native -Version 1.0.0-preview.1
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="Faiss.NET.Native" Version="1.0.0-preview.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Faiss.NET.Native" Version="1.0.0-preview.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Faiss.NET.Native" />
                    


                            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 Faiss.NET.Native --version 1.0.0-preview.1
                    


                    

                
#r "nuget: Faiss.NET.Native, 1.0.0-preview.1"
#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 Faiss.NET.Native@1.0.0-preview.1
#: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=Faiss.NET.Native&version=1.0.0-preview.1&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Faiss.NET.Native&version=1.0.0-preview.1&prerelease
                    


                            Install as a Cake Tool

License Build and Package Faiss

Faiss.NET

C# bindings for Faiss.

This library is under active construction and currently not usable yet.

Implemented Indexes
  • IndexFlatIP
  • IndexFlatL2
  • IndexHNSW

Also, a generic Index factory is implemented which can be used to instantiate all other Faiss supported indexes.

This library aims to be as "bare metal" as possible while being straightforward to work with.

Additionally, Index serialization/deserialization and GPU Indexes + sharding is supported.

Supported Platforms:
Platform x64 arm64
Windows ✅ ✅
Linux ✅ ✅
MacOS ✅ ✅
GPU Acceleration:
Platform x64 arm64
CUDA (Linux) ✅ ✅
ROCm (Linux) ✅ ❌

Installation

Prerequisites

Windows

You need a C++ redistributable installed. E.g.

$ winget install --id Microsoft.VCRedist.2015+.x64 --silent
Linux

OpenBLAS, OpenMP and Fortran runtimes must be installed. E.g.

$ sudo apt-get install -y libopenblas0 libgomp1 libgfortran5
MacOS

An OpenMP runtime is required. E.g.

$ brew install libomp

NuGet

Get the base NuGet:

$ dotnet add package Faiss.NET

Then pick a native package:

Either cpu only or with additional gpu support.

CPU only
$ dotnet add package Faiss.NET.Native
CPU+GPU
$ dotnet add package Faiss.NET.Gpu.Cuda # Linux only
$ dotnet add package Faiss.NET.Windows
$ dotnet add package Faiss.NET.MacOS

or

$ dotnet add package Faiss.NET.Native.Gpu.Rocm # Linux x64 only
$ dotnet add package Faiss.NET.Windows
$ dotnet add package Faiss.NET.MacOS

Usage

Basic

using Faiss.NET;

int dimensions = 4;
using var index = new FaissIndex<FaissIndexFlatL2>(new FaissIndexFlatL2(dimensions));

float[] vectors = { 1.0f, 2.0f, 3.0f, 4.0f };

index.Add(vectors);

using var searchResult = index.Search(vectors, 1);

float distance = searchResult.Distances[0]; // 0.0f
long label = searchResult.Labels[0]; // 0

Examples

Low-Level index usage
using Faiss.NET;

int dimensions = 2;
using var index = new FaissIndexFlatIP(dimensions);

float[] vectors = { 2.0f, 3.0f };
index.Add(1, vectors);

float[] distances = new float[1];
long[] labels = new long[1];

index.Search(1, vectors, 1, distances, labels);

long foundLabel = labels[0]; // 0
float foundDistance = distances[0]; // 13
There are no supported framework assets in this package.

Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.0.0-preview.3 28 3/31/2026
1.0.0-preview.2 40 3/30/2026
1.0.0-preview.1 43 3/27/2026