Unified HuggingFace Checkpoint

We support exporting modelopt-optimized Huggingface models and Megatron Core models to a unified checkpoint format that can be deployed in various inference frameworks such as TensorRT-LLM, vLLM, and SGLang.

The workflow is as follows:

1. Load the Huggingface models or Megatron Core models, optimize/quantize with modelopt, and export to the unified checkpoint format, where the layer structures and tensor names are aligned with the original checkpoint.

2. Load the unified checkpoint in the supported inference framework for accelerated inference.

Export Quantized Model

The modelopt quantized model can be exported to the unified checkpoint format stored as

1. A group of safetensors files, containing quantized model weights and scaling factors.

2. A hf_quant_config.json file containing quantization configurations.

3. Other json files that store the model structure information, tokenizer information, and metadata.

The export API (export_hf_checkpoint) can be used as follows:

from modelopt.torch.export import export_hf_checkpoint

with torch.inference_mode():
    export_hf_checkpoint(
        model,  # The quantized model.
        export_dir,  # The directory where the exported files will be stored.
    )

Deployment with Selected Inference Frameworks

TensorRT-LLM

Follow the TensorRT-LLM installation instructions.

Currently we support fp8 and nvfp4 quantized models for TensorRT-LLM deployment, you need v0.17.0 or later version of TensorRT-LLM.

To run modelopt quantized model from Huggingface model hub, e.g., nvidia/Llama-3.1-8B-Instruct-FP8, refer to the sample code below:

from tensorrt_llm import LLM, SamplingParams

def main():

    prompts = [
        "Hello, my name is",
        "The president of the United States is",
        "The capital of France is",
        "The future of AI is",
    ]
    sampling_params = SamplingParams(temperature=0.8, top_p=0.95)

    llm = LLM(model="nvidia/Llama-3.1-8B-Instruct-FP8")

    outputs = llm.generate(prompts, sampling_params)

    for output in outputs:
        prompt = output.prompt
        generated_text = output.outputs[0].text
        print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")

if __name__ == '__main__':
    main()

vLLM

Follow vLLM installation instructions.

Currently we support fp8 quantized models (without fp8 kv cache) for vLLM deployment, you need v0.6.5 or later version of vLLM.

To run modelopt quantized model from Huggingface model hub, e.g., nvidia/Llama-3.1-8B-Instruct-FP8, refer to the sample code below:

from vllm import LLM, SamplingParams

def main():

    model_id = "nvidia/Llama-3.1-8B-Instruct-FP8"
    sampling_params = SamplingParams(temperature=0.8, top_p=0.9)

    prompts = [
        "Hello, my name is",
        "The president of the United States is",
        "The capital of France is",
        "The future of AI is",
    ]

    llm = LLM(model=model_id, quantization="modelopt")
    outputs = llm.generate(prompts, sampling_params)

    for output in outputs:
        prompt = output.prompt
        generated_text = output.outputs[0].text
        print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")

if __name__ == "__main__":
    main()

SGLang

Follow the SGLang installation instructions.

Currently we support fp8 quantized models (without fp8 kv cache) for SGLang deployment, you need to use the main branch of SGLang (since Jan 6, 2025) and build it from source.

To run modelopt quantized model from Huggingface model hub, e.g., nvidia/Llama-3.1-8B-Instruct-FP8, refer to the sample code below:

import sglang as sgl

def main():

    prompts = [
        "Hello, my name is",
        "The president of the United States is",
        "The capital of France is",
        "The future of AI is",
    ]
    sampling_params = {"temperature": 0.8, "top_p": 0.95}
    llm = sgl.Engine(model_path="nvidia/Llama-3.1-8B-Instruct-FP8", quantization="modelopt")

    outputs = llm.generate(prompts, sampling_params)
    for prompt, output in zip(prompts, outputs):
        print("===============================")
        print(f"Prompt: {prompt}\nGenerated text: {output['text']}")

if __name__ == "__main__":
    main()