[Quality] Add CI for formatting (#343)

.github/workflows/pylint.yml

+name: pylint
+
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  pylint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10"]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pylint==2.8.2
+    - name: Analysing the code with pylint
+      run: |
+        pylint vllm

.github/workflows/yapf.yml

+name: yapf
+
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  yapf:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10"]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install yapf==0.32.0
+        pip install toml==0.10.2
+    - name: Running yapf
+      run: |
+        yapf --diff --recursive vllm --exclude 'vllm/model_executor/parallel_utils/**'

vllm/engine/async_llm_engine.py

@@ -2,6 +2,7 @@ import asyncio
 import time
 from typing import Dict, List, Optional
 
+from vllm.config import ModelConfig
 from vllm.engine.arg_utils import AsyncEngineArgs
 from vllm.engine.llm_engine import LLMEngine
 from vllm.engine.ray_utils import initialize_cluster, ray
@@ -206,6 +207,13 @@ class AsyncLLMEngine:
             self.is_engine_running = False
             self.kicking_request_id = None
 
+    async def get_model_config(self) -> ModelConfig:
+        """Get the model configuration of the vLLM engine."""
+        if self.engine_use_ray:
+            return await self.engine.get_model_config.remote()
+        else:
+            return self.engine.get_model_config()
+
     @classmethod
     def from_engine_args(cls,
                          engine_args: AsyncEngineArgs) -> "AsyncLLMEngine":

vllm/engine/llm_engine.py

@@ -210,6 +210,10 @@ class LLMEngine:
         """
         self.scheduler.abort_seq_group(request_id)
 
+    def get_model_config(self) -> ModelConfig:
+        """Gets the model configuration."""
+        return self.model_config
+
     def get_num_unfinished_requests(self) -> int:
         """Gets the number of unfinished requests."""
         return self.scheduler.get_num_unfinished_seq_groups()

vllm/entrypoints/openai/api_server.py

@@ -2,16 +2,19 @@
 # https://github.com/lm-sys/FastChat/blob/168ccc29d3f7edc50823016105c024fe2282732a/fastchat/serve/openai_api_server.py
 
 import argparse
+import asyncio
 from http import HTTPStatus
 import json
 import time
-from typing import AsyncGenerator, Dict, List, Optional, Union, Any
+from typing import AsyncGenerator, Dict, List, Optional
 
 import fastapi
 from fastapi import BackgroundTasks, Request
 from fastapi.exceptions import RequestValidationError
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse, StreamingResponse
+from fastchat.conversation import (Conversation, SeparatorStyle,
+                                   get_conv_template)
 import uvicorn
 
 from vllm.engine.arg_utils import AsyncEngineArgs
@@ -19,11 +22,10 @@ from vllm.engine.async_llm_engine import AsyncLLMEngine
 from vllm.entrypoints.openai.protocol import (
     CompletionRequest, CompletionResponse, CompletionResponseChoice,
     CompletionResponseStreamChoice, CompletionStreamResponse,
-    ChatCompletionRequest, ChatCompletionResponse, ChatCompletionResponseChoice,
-    ChatCompletionResponseStreamChoice, ChatCompletionStreamResponse,
-    ChatMessage, DeltaMessage, ErrorResponse, LogProbs,
-    ModelCard, ModelList, ModelPermission, UsageInfo)
-from fastchat.conversation import Conversation, SeparatorStyle, get_conv_template
+    ChatCompletionRequest, ChatCompletionResponse,
+    ChatCompletionResponseChoice, ChatCompletionResponseStreamChoice,
+    ChatCompletionStreamResponse, ChatMessage, DeltaMessage, ErrorResponse,
+    LogProbs, ModelCard, ModelList, ModelPermission, UsageInfo)
 from vllm.logger import init_logger
 from vllm.outputs import RequestOutput
 from vllm.sampling_params import SamplingParams
@@ -95,15 +97,15 @@ async def get_gen_prompt(request) -> str:
     return prompt
 
 
-async def check_length(request, prompt, engine):
-    if hasattr(engine.engine.model_config.hf_config, "max_sequence_length"):
-        context_len = engine.engine.model_config.hf_config.max_sequence_length
-    elif hasattr(engine.engine.model_config.hf_config, "seq_length"):
-        context_len = engine.engine.model_config.hf_config.seq_length
-    elif hasattr(engine.engine.model_config.hf_config, "max_position_embeddings"):
-        context_len = engine.engine.model_config.hf_config.max_position_embeddings
-    elif hasattr(engine.engine.model_config.hf_config, "seq_length"):
-        context_len = engine.engine.model_config.hf_config.seq_length
+async def check_length(request, prompt, model_config):
+    if hasattr(model_config.hf_config, "max_sequence_length"):
+        context_len = model_config.hf_config.max_sequence_length
+    elif hasattr(model_config.hf_config, "seq_length"):
+        context_len = model_config.hf_config.seq_length
+    elif hasattr(model_config.hf_config, "max_position_embeddings"):
+        context_len = model_config.hf_config.max_position_embeddings
+    elif hasattr(model_config.hf_config, "seq_length"):
+        context_len = model_config.hf_config.seq_length
     else:
         context_len = 2048
 
@@ -182,7 +184,7 @@ async def create_chat_completion(raw_request: Request):
                                      "logit_bias is not currently supported")
 
     prompt = await get_gen_prompt(request)
-    error_check_ret = await check_length(request, prompt, engine)
+    error_check_ret = await check_length(request, prompt, engine_model_config)
     if error_check_ret is not None:
         return error_check_ret
 
@@ -206,15 +208,16 @@ async def create_chat_completion(raw_request: Request):
     except ValueError as e:
         return create_error_response(HTTPStatus.BAD_REQUEST, str(e))
 
-    result_generator = engine.generate(prompt, sampling_params,
-                                       request_id)
+    result_generator = engine.generate(prompt, sampling_params, request_id)
 
     async def abort_request() -> None:
         await engine.abort(request_id)
 
-    def create_stream_response_json(index: int,
-                                    text: str,
-                                    finish_reason: Optional[str] = None) -> str:
+    def create_stream_response_json(
+        index: int,
+        text: str,
+        finish_reason: Optional[str] = None,
+    ) -> str:
         choice_data = ChatCompletionResponseStreamChoice(
             index=index,
             delta=DeltaMessage(content=text),
@@ -238,10 +241,11 @@ async def create_chat_completion(raw_request: Request):
                 delta=DeltaMessage(role="assistant"),
                 finish_reason=None,
             )
-            chunk = ChatCompletionStreamResponse(
-                id=request_id, choices=[choice_data], model=model_name
-            )
-            yield f"data: {chunk.json(exclude_unset=True, ensure_ascii=False)}\n\n"
+            chunk = ChatCompletionStreamResponse(id=request_id,
+                                                 choices=[choice_data],
+                                                 model=model_name)
+            data = chunk.json(exclude_unset=True, ensure_ascii=False)
+            yield f"data: {data}\n\n"
 
         previous_texts = [""] * request.n
         previous_num_tokens = [0] * request.n
@@ -295,8 +299,8 @@ async def create_chat_completion(raw_request: Request):
         choices.append(choice_data)
 
     num_prompt_tokens = len(final_res.prompt_token_ids)
-    num_generated_tokens = sum(len(output.token_ids)
-                               for output in final_res.outputs)
+    num_generated_tokens = sum(
+        len(output.token_ids) for output in final_res.outputs)
     usage = UsageInfo(
         prompt_tokens=num_prompt_tokens,
         completion_tokens=num_generated_tokens,
@@ -314,9 +318,11 @@ async def create_chat_completion(raw_request: Request):
         # When user requests streaming but we don't stream, we still need to
         # return a streaming response with a single event.
         response_json = response.json(ensure_ascii=False)
+
         async def fake_stream_generator() -> AsyncGenerator[str, None]:
             yield f"data: {response_json}\n\n"
             yield "data: [DONE]\n\n"
+
         return StreamingResponse(fake_stream_generator(),
                                  media_type="text/event-stream")
 
@@ -367,9 +373,9 @@ async def create_completion(raw_request: Request):
             return create_error_response(HTTPStatus.BAD_REQUEST,
                                          "please provide at least one prompt")
         if len(request.prompt) > 1:
-            return create_error_response(HTTPStatus.BAD_REQUEST,
-                                         "multiple prompts in a batch is not "
-                                         "currently supported")
+            return create_error_response(
+                HTTPStatus.BAD_REQUEST,
+                "multiple prompts in a batch is not currently supported")
         prompt = request.prompt[0]
     else:
         prompt = request.prompt
@@ -571,6 +577,7 @@ if __name__ == "__main__":
 
     engine_args = AsyncEngineArgs.from_cli_args(args)
     engine = AsyncLLMEngine.from_engine_args(engine_args)
+    engine_model_config = asyncio.run(engine.get_model_config())
 
     # A separate tokenizer to map token IDs to strings.
     tokenizer = get_tokenizer(engine_args.tokenizer,

vllm/model_executor/models/bloom.py

 # coding=utf-8
-# Adapted from https://github.com/huggingface/transformers/blob/v4.28.0/src/transformers/models/bloom/modeling_bloom.py
+# Adapted from
+# https://github.com/huggingface/transformers/blob/v4.28.0/src/transformers/models/bloom/modeling_bloom.py
 # Copyright 2023 The CacheFlow team.
 # Copyright 2022 HuggingFace Inc. team and BigScience workshop.
 #