【vLLM 学习】Mistral-small

vLLM 是一款专为大语言模型推理加速而设计的框架，实现了 KV 缓存内存几乎零浪费，解决了内存管理瓶颈问题。

更多 vLLM 中文文档及教程可访问 →https://vllm.hyper.ai/

*在线运行 vLLM 入门教程：零基础分步指南

源码 examples/offline_inference/mistral-small.py

# SPDX-License-Identifier: Apache-2.0

# ruff: noqa
import argparse

from vllm import LLM
from vllm.sampling_params import SamplingParams

# 此脚本是用于运行 Mistral-Small-3.1的脱机演示。
#
# 如果要运行服务器/客户端设置，请按以下代码:
#
#  - 服务器:
#
# ```bash
# vllm serve mistralai/Mistral-Small-3.1-24B-Instruct-2503 \
#   --tokenizer-mode mistral --config-format mistral --load-format mistral \
#   --limit-mm-per-prompt 'image=4' --max-model-len 16384
# ```
#
#  - 服务器:
#
# ```bash
# curl --location 'http://<your-node-url>:8000/v1/chat/completions' \
# --header 'Content-Type: application/json' \
# --header 'Authorization: Bearer token' \
# --data '{
#     "model": "mistralai/Mistral-Small-3.1-24B-Instruct-2503",
#     "messages": [
#       {
#         "role": "user",
#         "content": [
#             {"type" : "text", "text": "Describe this image in detail please."},
#             {"type": "image_url", "image_url": {"url": "https://s3.amazonaws.com/cms.ipressroom.com/338/files/201808/5b894ee1a138352221103195_A680%7Ejogging-edit/A680%7Ejogging-edit_hero.jpg"}},
#             {"type" : "text", "text": "and this one as well. Answer in French."},
#             {"type": "image_url", "image_url": {"url": "https://www.wolframcloud.com/obj/resourcesystem/images/a0e/a0ee3983-46c6-4c92-b85d-059044639928/6af8cfb971db031b.png"}}
#         ]
#       }
#     ]
#   }'
# ```
#
# 用法:
#     python demo.py simple
#     python demo.py advanced

def run_simple_demo(args: argparse.Namespace):
    model_name = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"
    sampling_params = SamplingParams(max_tokens=8192)

    # Lower max_model_len and/or max_num_seqs on low-VRAM GPUs.
    # 低 VRAM GPU 上的 lower max_model_len 和/或 max_num_seqs。
    llm = LLM(
        model=model_name,
        tokenizer_mode="mistral",
        config_format="mistral",
        load_format="mistral",
        max_model_len=4096,
        max_num_seqs=2,
        disable_mm_preprocessor_cache=args.disable_mm_preprocessor_cache,
    )

    prompt = "Describe this image in one sentence."
    image_url = "https://picsum.photos/id/237/200/300"

    messages = [
        {
            "role":
            "user",
            "content": [
                {
                    "type": "text",
                    "text": prompt
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": image_url
                    }
                },
            ],
        },
    ]
    outputs = llm.chat(messages, sampling_params=sampling_params)

    print(outputs[0].outputs[0].text)


def run_advanced_demo(args: argparse.Namespace):
    model_name = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"
    max_img_per_msg = 5
    max_tokens_per_img = 4096

    sampling_params = SamplingParams(max_tokens=8192, temperature=0.7)
    llm = LLM(
        model=model_name,
        tokenizer_mode="mistral",
        config_format="mistral",
        load_format="mistral",
        limit_mm_per_prompt={"image": max_img_per_msg},
        max_model_len=max_img_per_msg * max_tokens_per_img,
        disable_mm_preprocessor_cache=args.disable_mm_preprocessor_cache,
    )

    prompt = "Describe the following image."

    url_1 = "https://huggingface.co/datasets/patrickvonplaten/random_img/resolve/main/yosemite.png"
    url_2 = "https://picsum.photos/seed/picsum/200/300"
    url_3 = "https://picsum.photos/id/32/512/512"

    messages = [
        {
            "role":
            "user",
            "content": [
                {
                    "type": "text",
                    "text": prompt
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": url_1
                    }
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": url_2
                    }
                },
            ],
        },
        {
            "role": "assistant",
            "content": "The images show nature.",
        },
        {
            "role": "user",
            "content": "More details please and answer only in French!.",
        },
        {
            "role": "user",
            "content": [
                {
                    "type": "image_url",
                    "image_url": {
                        "url": url_3
                    }
                },
            ],
        },
    ]

    outputs = llm.chat(messages=messages, sampling_params=sampling_params)
    print(outputs[0].outputs[0].text)


def main():
    parser = argparse.ArgumentParser(
        description="Run a demo in simple or advanced mode.")

    parser.add_argument(
        "mode",
        choices=["simple", "advanced"],
        help="Specify the demo mode: 'simple' or 'advanced'",
    )

    parser.add_argument(
        '--disable-mm-preprocessor-cache',
        action='store_true',
        help='If True, disables caching of multi-modal preprocessor/mapper.')

    args = parser.parse_args()

    if args.mode == "simple":
        print("Running simple demo...")
        run_simple_demo(args)
    elif args.mode == "advanced":
        print("Running advanced demo...")
        run_advanced_demo(args)


if __name__ == "__main__":
    main()