Billy D.
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116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
"""
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Ray Serve deployment for vLLM with OpenAI-compatible API.
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Runs on: khelben (Strix Halo 64GB, ROCm)
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"""
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import os
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import time
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import uuid
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from typing import Any
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from ray import serve
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@serve.deployment(name="LLMDeployment", num_replicas=1)
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class LLMDeployment:
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def __init__(self):
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from vllm import SamplingParams
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from vllm.engine.arg_utils import AsyncEngineArgs
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from vllm.engine.async_llm_engine import AsyncLLMEngine
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self.model_id = os.environ.get("MODEL_ID", "meta-llama/Llama-3.1-70B-Instruct")
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self.max_model_len = int(os.environ.get("MAX_MODEL_LEN", "8192"))
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self.gpu_memory_utilization = float(os.environ.get("GPU_MEMORY_UTILIZATION", "0.9"))
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print(f"Loading vLLM model: {self.model_id}")
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print(f"Max model length: {self.max_model_len}")
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print(f"GPU memory utilization: {self.gpu_memory_utilization}")
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engine_args = AsyncEngineArgs(
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model=self.model_id,
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max_model_len=self.max_model_len,
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gpu_memory_utilization=self.gpu_memory_utilization,
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trust_remote_code=True,
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disable_log_stats=True,
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)
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self.engine = AsyncLLMEngine.from_engine_args(engine_args)
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self.SamplingParams = SamplingParams
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print(f"Model {self.model_id} async engine created")
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async def __call__(self, request: dict[str, Any]) -> dict[str, Any]:
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"""
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Handle OpenAI-compatible chat completion requests.
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Expected request format:
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{
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"model": "model-name",
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"messages": [{"role": "user", "content": "Hello"}],
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"temperature": 0.7,
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"max_tokens": 256,
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"top_p": 1.0,
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"stream": false
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}
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"""
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messages = request.get("messages", [])
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temperature = request.get("temperature", 0.7)
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max_tokens = request.get("max_tokens", 256)
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top_p = request.get("top_p", 1.0)
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stop = request.get("stop")
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# Convert messages to prompt
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prompt = self._format_messages(messages)
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sampling_params = self.SamplingParams(
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temperature=temperature,
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max_tokens=max_tokens,
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top_p=top_p,
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stop=stop,
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)
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request_id = uuid.uuid4().hex
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final_result = None
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async for result in self.engine.generate(prompt, sampling_params, request_id):
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final_result = result
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generated_text = final_result.outputs[0].text
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# Return OpenAI-compatible response
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return {
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"id": f"chatcmpl-{uuid.uuid4().hex[:8]}",
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"object": "chat.completion",
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"created": int(time.time()),
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"model": self.model_id,
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"choices": [
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{
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"index": 0,
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"message": {
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"role": "assistant",
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"content": generated_text,
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},
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"finish_reason": "stop",
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}
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],
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"usage": {
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"prompt_tokens": len(prompt.split()),
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"completion_tokens": len(generated_text.split()),
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"total_tokens": len(prompt.split()) + len(generated_text.split()),
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},
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}
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def _format_messages(self, messages: list[dict[str, str]]) -> str:
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"""Format chat messages into a prompt string."""
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formatted = ""
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for msg in messages:
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role = msg.get("role", "user")
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content = msg.get("content", "")
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if role == "system":
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formatted += f"<|begin_of_text|><|start_header_id|>system<|end_header_id|>\n\n{content}<|eot_id|>"
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elif role == "user":
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formatted += f"<|start_header_id|>user<|end_header_id|>\n\n{content}<|eot_id|>"
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elif role == "assistant":
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formatted += f"<|start_header_id|>assistant<|end_header_id|>\n\n{content}<|eot_id|>"
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formatted += "<|start_header_id|>assistant<|end_header_id|>\n\n"
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return formatted
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app = LLMDeployment.bind()
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