impls -> inline, adapters -> remote (#381)

llama_stack/providers/remote/inference/vllm/vllm.py

@@ -0,0 +1,151 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+from typing import AsyncGenerator
+
+from llama_models.llama3.api.chat_format import ChatFormat
+from llama_models.llama3.api.datatypes import Message
+from llama_models.llama3.api.tokenizer import Tokenizer
+from llama_models.sku_list import all_registered_models, resolve_model
+
+from openai import OpenAI
+
+from llama_stack.apis.inference import *  # noqa: F403
+from llama_stack.providers.datatypes import ModelsProtocolPrivate
+
+from llama_stack.providers.utils.inference.openai_compat import (
+    get_sampling_options,
+    process_chat_completion_response,
+    process_chat_completion_stream_response,
+)
+from llama_stack.providers.utils.inference.prompt_adapter import (
+    chat_completion_request_to_prompt,
+)
+
+from .config import VLLMInferenceAdapterConfig
+
+
+class VLLMInferenceAdapter(Inference, ModelsProtocolPrivate):
+    def __init__(self, config: VLLMInferenceAdapterConfig) -> None:
+        self.config = config
+        self.formatter = ChatFormat(Tokenizer.get_instance())
+        self.client = None
+        self.huggingface_repo_to_llama_model_id = {
+            model.huggingface_repo: model.descriptor()
+            for model in all_registered_models()
+            if model.huggingface_repo
+        }
+
+    async def initialize(self) -> None:
+        self.client = OpenAI(base_url=self.config.url, api_key=self.config.api_token)
+
+    async def register_model(self, model: ModelDef) -> None:
+        raise ValueError("Model registration is not supported for vLLM models")
+
+    async def shutdown(self) -> None:
+        pass
+
+    async def list_models(self) -> List[ModelDef]:
+        models = []
+        for model in self.client.models.list():
+            repo = model.id
+            if repo not in self.huggingface_repo_to_llama_model_id:
+                print(f"Unknown model served by vllm: {repo}")
+                continue
+
+            identifier = self.huggingface_repo_to_llama_model_id[repo]
+            models.append(
+                ModelDef(
+                    identifier=identifier,
+                    llama_model=identifier,
+                )
+            )
+        return models
+
+    async def completion(
+        self,
+        model: str,
+        content: InterleavedTextMedia,
+        sampling_params: Optional[SamplingParams] = SamplingParams(),
+        response_format: Optional[ResponseFormat] = None,
+        stream: Optional[bool] = False,
+        logprobs: Optional[LogProbConfig] = None,
+    ) -> Union[CompletionResponse, CompletionResponseStreamChunk]:
+        raise NotImplementedError()
+
+    async def chat_completion(
+        self,
+        model: str,
+        messages: List[Message],
+        sampling_params: Optional[SamplingParams] = SamplingParams(),
+        response_format: Optional[ResponseFormat] = None,
+        tools: Optional[List[ToolDefinition]] = None,
+        tool_choice: Optional[ToolChoice] = ToolChoice.auto,
+        tool_prompt_format: Optional[ToolPromptFormat] = ToolPromptFormat.json,
+        stream: Optional[bool] = False,
+        logprobs: Optional[LogProbConfig] = None,
+    ) -> AsyncGenerator:
+        request = ChatCompletionRequest(
+            model=model,
+            messages=messages,
+            sampling_params=sampling_params,
+            tools=tools or [],
+            tool_choice=tool_choice,
+            tool_prompt_format=tool_prompt_format,
+            stream=stream,
+            logprobs=logprobs,
+        )
+        if stream:
+            return self._stream_chat_completion(request, self.client)
+        else:
+            return await self._nonstream_chat_completion(request, self.client)
+
+    async def _nonstream_chat_completion(
+        self, request: ChatCompletionRequest, client: OpenAI
+    ) -> ChatCompletionResponse:
+        params = self._get_params(request)
+        r = client.completions.create(**params)
+        return process_chat_completion_response(r, self.formatter)
+
+    async def _stream_chat_completion(
+        self, request: ChatCompletionRequest, client: OpenAI
+    ) -> AsyncGenerator:
+        params = self._get_params(request)
+
+        # TODO: Can we use client.completions.acreate() or maybe there is another way to directly create an async
+        #  generator so this wrapper is not necessary?
+        async def _to_async_generator():
+            s = client.completions.create(**params)
+            for chunk in s:
+                yield chunk
+
+        stream = _to_async_generator()
+        async for chunk in process_chat_completion_stream_response(
+            stream, self.formatter
+        ):
+            yield chunk
+
+    def _get_params(self, request: ChatCompletionRequest) -> dict:
+        options = get_sampling_options(request.sampling_params)
+        if "max_tokens" not in options:
+            options["max_tokens"] = self.config.max_tokens
+
+        model = resolve_model(request.model)
+        if model is None:
+            raise ValueError(f"Unknown model: {request.model}")
+
+        return {
+            "model": model.huggingface_repo,
+            "prompt": chat_completion_request_to_prompt(request, self.formatter),
+            "stream": request.stream,
+            **options,
+        }
+
+    async def embeddings(
+        self,
+        model: str,
+        contents: List[InterleavedTextMedia],
+    ) -> EmbeddingsResponse:
+        raise NotImplementedError()