Faiss.NET.Interop 1.0.0-preview.3

.NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher.
This is a prerelease version of Faiss.NET.Interop. 
dotnet add package Faiss.NET.Interop --version 1.0.0-preview.3
                    


                    

                
NuGet\Install-Package Faiss.NET.Interop -Version 1.0.0-preview.3
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.Interop" Version="1.0.0-preview.3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Faiss.NET.Interop" Version="1.0.0-preview.3" />
                    


                            Directory.Packages.props
                        

                    

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


                            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.Interop --version 1.0.0-preview.3
                    


                    

                
#r "nuget: Faiss.NET.Interop, 1.0.0-preview.3"
#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.Interop@1.0.0-preview.3
#: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.Interop&version=1.0.0-preview.3&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Faiss.NET.Interop&version=1.0.0-preview.3&prerelease
                    


                            Install as a Cake Tool

License Build and Package Faiss NuGet

Faiss.NET

High-performance C#/.NET bindings for Faiss.

Faiss.NET gives you near-native performance with clean, idiomatic C# wrappers while staying as close as possible to the original Faiss API.

This library is under active development. Core indexes and functionality are usable, but the API may still evolve and not every feature is complete yet.

Features

  • Thin, "bare-metal" bindings with minimal overhead
  • Strongly-typed wrappers + generic factory for all Faiss indexes
  • Currently implemented indexes:
    • IndexFlatIP
    • IndexFlatL2
    • IndexHNSW
  • Full index serialization / deserialization
  • GPU acceleration (CUDA & ROCm) + GPU sharding
  • Cross-platform support (Windows, Linux, macOS — x64 & arm64)

Table of Contents

Supported Platforms

Platform x64 arm64
Windows ✅ ✅
Linux ✅ ✅
macOS ✅ ✅

GPU Acceleration

Backend Platform x64 arm64
CUDA Linux ✅ ✅
ROCm Linux ✅ ❌

Supported CUDA GPUs

Compute Capability Architecture Example GPUs
75 Turing RTX 20-series, Tesla T4
80 Ampere A100
86 Ampere RTX 30-series, A40, A10, A16, A30
89 Ada Lovelace RTX 40-series, L40, L40S, L4
90 Hopper H100, H200
120 Blackwell RTX 50-series, B100, B200, GB200

Supported ROCm GPUs

GFX Architecture Architecture Example GPUs
gfx90a CDNA2 AMD Instinct MI210, MI250, MI250X
gfx942 CDNA3 AMD Instinct MI300A, MI300X, MI325X
gfx950 CDNA4 AMD Instinct MI355X, MI350 series
gfx1030 / 1031 / 1032 RDNA2 Radeon RX 6600–6900 series
gfx1100 / 1101 / 1102 RDNA3 Radeon RX 7700–7900 series
gfx1200 / 1201 RDNA4 Radeon RX 9060 series and RX 9070 series

Installation

Prerequisites

Windows

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

Linux

sudo apt-get install -y libopenblas0 libgomp1 libgfortran5

macOS

brew install libomp

NuGet Package

CPU only
dotnet add package Faiss.NET.Native
CPU+GPU
CUDA
dotnet add package Faiss.NET.Native.Gpu.Cuda # Linux only
dotnet add package Faiss.NET.Native.Windows
dotnet add package Faiss.NET.Native.MacOS
ROCm
dotnet add package Faiss.NET.Native.Gpu.Rocm # Linux x64 only
dotnet add package Faiss.NET.Native.Windows
dotnet add package Faiss.NET.Native.MacOS

Usage

Basic Example

using Faiss.NET;

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

float[] vector = [1.0f, 2.0f, 3.0f, 4.0f];

index.Add(vector);

using var result = index.Search(vector, k: 1);

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

Low-Level API Example

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

License

This project is licensed under the MIT License — see the LICENSE file for details.

Faiss.NET is not affiliated with Meta or the original Faiss project.

Product Compatible and additional computed target framework versions.
.NET net9.0 is compatible.  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 was computed.  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. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • net9.0

    • No dependencies.

NuGet packages (5)

Showing the top 5 NuGet packages that depend on Faiss.NET.Interop:

Package Downloads
Faiss.NET.Gpu

GPU extension for Faiss.NET.
Faiss.NET.Native

Cross-platform native binaries meta-package for Faiss.NET. Includes Linux, Windows, and macOS runtimes.
Faiss.NET.Native.Windows

Native Windows (x64 and arm64) binaries for Faiss.NET.
Faiss.NET.Native.Linux

Native Linux (x64 and arm64) binaries for Faiss.NET.
Faiss.NET.Native.MacOS

Native MacOS (x64 and arm64) binaries for Faiss.NET.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.0.0-preview.3 31 3/31/2026
1.0.0-preview.2 43 3/30/2026