LLaMA C#/.NET 库

Installation

To gain high performance, LLamaSharp interacts with native libraries compiled from c++, these are called backends. We provide backend packages for Windows, Linux and Mac with CPU, CUDA, Metal and Vulkan. You don't need to compile any c++, just install the backend packages.

If no published backend matches your device, please open an issue to let us know. If compiling c++ code is not difficult for you, you could also follow this guide to compile a backend and run LLamaSharp with it.

1. Install LLamaSharp package on NuGet:

PM> Install-Package LLamaSharp

1. Install one or more of these backends, or use a self-compiled backend.

• LLamaSharp.Backend.Cpu: Pure CPU for Windows, Linux & Mac. Metal (GPU) support for Mac.
• LLamaSharp.Backend.Cuda11: CUDA 11 for Windows & Linux.
• LLamaSharp.Backend.Cuda12: CUDA 12 for Windows & Linux.
• LLamaSharp.Backend.Vulkan: Vulkan for Windows & Linux.

1. (optional) For Microsoft semantic-kernel integration, install the LLamaSharp.semantic-kernel package.
2. (optional) To enable RAG support, install the LLamaSharp.kernel-memory package (this package only supports net6.0 or higher yet), which is based on Microsoft kernel-memory integration.

🔗Integrations & Examples

There are integrations for the following libraries, making it easier to develop your APP. Integrations for semantic-kernel and kernel-memory are developed in the LLamaSharp repository, while others are developed in their own repositories.

• semantic-kernel: an SDK that integrates LLMs like OpenAI, Azure OpenAI, and Hugging Face.
• kernel-memory: a multi-modal AI Service specialized in the efficient indexing of datasets through custom continuous data hybrid pipelines, with support for RAG (Retrieval Augmented Generation), synthetic memory, prompt engineering, and custom semantic memory processing.
• BotSharp: an open source machine learning framework for AI Bot platform builder.
• Langchain: a framework for developing applications powered by language models.
• MaIN.NET: simplistic approach to orchestrating agents/chats from different (llm) providers

The following examples show how to build APPs with LLamaSharp.

• Official Console Examples
• Unity Demo
• LLamaStack (with WPF and Web demo)
• Blazor Demo (with Model Explorer)
• ASP.NET Demo
• LLamaWorker (ASP.NET Web API like OAI and Function Calling Support)
• VirtualPet (Desktop Application)
• KaiROS AI (Local AI Assistant for Windows & Android)

Example of LLaMA chat session

Here is a simple example to chat with a bot based on a LLM in LLamaSharp. Please replace the model path with yours.

using LLama;
using LLama.Common;
using LLama.Sampling;

string modelPath = @"<Your Model Path>"; // change it to your own model path.

var parameters = new ModelParams(modelPath)
{
    ContextSize = 1024, // The longest length of chat as memory.
    GpuLayerCount = 5 // How many layers to offload to GPU. Please adjust it according to your GPU memory.
};
using var model = LLamaWeights.LoadFromFile(parameters);
using var context = model.CreateContext(parameters);
var executor = new InteractiveExecutor(context);

// Add chat histories as prompt to tell AI how to act.
var chatHistory = new ChatHistory();
chatHistory.AddMessage(AuthorRole.System, "Transcript of a dialog, where the User interacts with an Assistant named Bob. Bob is helpful, kind, honest, good at writing, and never fails to answer the User's requests immediately and with precision.");
chatHistory.AddMessage(AuthorRole.User, "Hello, Bob.");
chatHistory.AddMessage(AuthorRole.Assistant, "Hello. How may I help you today?");

ChatSession session = new(executor, chatHistory);

InferenceParams inferenceParams = new InferenceParams()
{
    MaxTokens = 256, // No more than 256 tokens should appear in answer. Remove it if antiprompt is enough for control.
    AntiPrompts = new List<string> { "User:" }, // Stop generation once antiprompts appear.

    SamplingPipeline = new DefaultSamplingPipeline(),
};

Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write("The chat session has started.\nUser: ");
Console.ForegroundColor = ConsoleColor.Green;
string userInput = Console.ReadLine() ?? "";

while (userInput != "exit")
{
    await foreach ( // Generate the response streamingly.
        var text
        in session.ChatAsync(
            new ChatHistory.Message(AuthorRole.User, userInput),
            inferenceParams))
    {
        Console.ForegroundColor = ConsoleColor.White;
        Console.Write(text);
    }
    Console.ForegroundColor = ConsoleColor.Green;
    userInput = Console.ReadLine() ?? "";
}

For more examples, please refer to LLamaSharp.Examples.

📌Console Demo

LLaMA	Multimodal

💡FAQ

Why is my GPU not used when I have installed CUDA?

1. If you are using backend packages, please make sure you have installed the CUDA backend package which matches the CUDA version installed on your system.
2. Add the following line to the very beginning of your code. The log will show which native library file is loaded. If the CPU library is loaded, please try to compile the native library yourself and open an issue for that. If the CUDA library is loaded, please check if GpuLayerCount > 0 when loading the model weight.

    NativeLibraryConfig.All.WithLogCallback(delegate (LLamaLogLevel level, string message) { Console.Write($"{level}: {message}"); } )

Why is the inference so slow?

Firstly, due to the large size of LLM models, it requires more time to generate output than other models, especially when you are using models larger than 30B parameters.

To see if that's a LLamaSharp performance issue, please follow the two tips below.

1. If you are using CUDA, Metal or Vulkan, please set GpuLayerCount as large as possible.
2. If it's still slower than you expect it to be, please try to run the same model with same setting in llama.cpp examples. If llama.cpp outperforms LLamaSharp significantly, it's likely a LLamaSharp BUG and please report that to us.

Why does the program crash before any output is generated?

Generally, there are two possible cases for this problem:

1. The native library (backend) you are using is not compatible with the LLamaSharp version. If you compiled the native library yourself, please make sure you have checked-out llama.cpp to the corresponding commit of LLamaSharp, which can be found at the bottom of README.
2. The model file you are using is not compatible with the backend. If you are using a GGUF file downloaded from huggingface, please check its publishing time.

Why is my model generating output infinitely?

Please set anti-prompt or max-length when executing the inference.