Project Title

mergekit — Toolkit for Merging Pre-trained Large Language Models

Overview

mergekit is a Python-based toolkit designed to merge pre-trained language models, offering an out-of-core approach for resource-constrained environments. It supports various merging algorithms and can be executed on CPU or accelerated with minimal VRAM, making it a versatile solution for combining model strengths without additional training or computational overhead.

Key Features

Supports multiple language models including Llama, Mistral, GPT-NeoX, and StableLM
Offers various merge methods and the ability to run on both CPU and GPU
Implements lazy loading of tensors for low memory usage
Provides interpolated gradients for parameter values
Enables piecewise assembly of language models ("Frankenmerging")
Includes Mixture of Experts merging, LORA extraction, and Evolutionary merge methods

Use Cases

Researchers and developers looking to combine specialized models into a single versatile model
Teams needing to transfer capabilities between models without access to training data
Enterprises seeking to optimize model performance while maintaining inference costs

Advantages

Reduces computational overhead compared to traditional ensembling
Maintains the same inference cost as a single model while achieving superior performance
Allows for creative model combinations to create new capabilities

Limitations / Considerations

The project's license is currently unknown, which may affect its use in commercial applications
The toolkit may require significant technical expertise to effectively configure and utilize

Hugging Face Transformers: A library of pre-trained models for Natural Language Processing, differing in that it focuses on model usage rather than merging.
EleutherAI GPT-NeoX: A project that provides pre-trained models, contrasting with mergekit by offering standalone models rather than a merging toolkit.

Basic Information

GitHub: https://github.com/arcee-ai/mergekit
Stars: 6,454
License: Unknown
Last Commit: 2025-11-17

📊 Project Information

Project Name: mergekit
GitHub URL: https://github.com/arcee-ai/mergekit
Programming Language: Python
⭐ Stars: 6,454
🍴 Forks: 632
📅 Created: 2023-08-21
🔄 Last Updated: 2025-11-17

🏷️ Project Topics

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📚 Documentation

huggingface_hub

Why Merge Models?
Features
Installation
Contributing
Usage

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mergekit

Project Description