Enable qwen2vl video

[drbh]

This PR is a work in progress that explores adding support for video inputs with Qwen2-VL. Thank you @mfarre for getting this effort started.

TODOS

• suport video_urls
• fetch video contents in router
• update protobufs to support video chunks
• handle padding video token inputs
• tokenize video bytes
• integrate video logic with vision model (update position ids)
• ensure tokenization process is correct
• add tests
• refactor/improve

update*

start server

text-generation-launcher \
--model-id Qwen/Qwen2-VL-7B-Instruct \
--max-batch-prefill-tokens 10000 \
--max-input-tokens 10000 \
--max-total-tokens 10001

send request

import requests
import json

def chat_completion(url="http://127.0.0.1:3000", video_url=None, prompt=None):
    messages = [{
        "role": "user",
        "content": [
            {
                "type": "video_url",
                "video_url": { 
                    "url": video_url
                }
            },
            {
                "type": "text",
                "text": prompt
            }
        ]
    }]

    payload = {
        "messages": messages,
        "seed": 42,
        "max_tokens": 30
    }

    response = requests.post(
        f"{url}/v1/chat/completions",
        json=payload,
        headers={"Content-Type": "application/json"}
    )

    return response.json()

video_url = "https://test-videos.co.uk/vids/bigbuckbunny/mp4/h264/360/Big_Buck_Bunny_360_10s_1MB.mp4"
result = chat_completion(
    video_url=video_url,
    prompt="Describe this video."
)
print(json.dumps(result, indent=2))
# {
#     "object": "chat.completion",
#     "id": "",
#     "created": 1731964042,
#     "model": "Qwen/Qwen2-VL-7B-Instruct",
#     "system_fingerprint": "2.4.1-dev0-native",
#     "choices": [
#         {
#             "index": 0,
#             "message": {
#                 "role": "assistant",
#                 "content": "The video showcases lush green trees with vibrant shades of green and various shades of yellow and brown, as well as moss-covered stumps and piles of moss",
#             },
#             "logprobs": null,
#             "finish_reason": "length",
#         }
#     ],
#     "usage": {"prompt_tokens": 9593, "completion_tokens": 30, "total_tokens": 9623},
# }

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