Merge pull request #835 from BITcyman/fix-openai_chat_completion

[fix] support openai chat completion api

ktransformers/server/api/ollama/completions.py

@@ -13,6 +13,8 @@ from ktransformers.server.utils.create_interface import get_interface
 from ktransformers.server.schemas.assistants.streaming import check_link_response
 from ktransformers.server.backend.base import BackendInterfaceBase
 
+from ktransformers.server.schemas.endpoints.chat import RawUsage
+
 router = APIRouter(prefix='/api')
 
 # https://github.com/ollama/ollama/blob/main/docs/api.md#generate-a-completion
@@ -58,7 +60,11 @@ async def generate(request: Request, input: OllamaGenerateCompletionRequest):
 
     if input.stream:
         async def inner():
-            async for token in interface.inference(input.prompt, id):
+            async for res in interface.inference(input.prompt, id):
+                if isinstance(res, RawUsage):
+                    raw_usage = res
+                else: 
+                    token, finish_reason = res
                     d = OllamaGenerationStreamResponse(
                         model=config.model_name,
                         created_at=str(datetime.now()),
@@ -123,7 +129,11 @@ async def chat(request: Request, input: OllamaChatCompletionRequest):
             eval_count = 0  # 统计生成的 token 数量
             tokens = []
 
-            async for token in interface.inference(prompt, id):
+            async for res in interface.inference(prompt, id):
+                if isinstance(res, RawUsage):
+                    raw_usage = res
+                else: 
+                    token, finish_reason = res
                     d = OllamaChatCompletionStreamResponse(
                         model=config.model_name,
                         created_at=str(datetime.now()),

ktransformers/server/api/openai/endpoints/chat.py

@@ -5,10 +5,16 @@ from fastapi import APIRouter
 from fastapi.requests import Request
 from ktransformers.server.utils.create_interface import get_interface
 from ktransformers.server.schemas.assistants.streaming import chat_stream_response
-from ktransformers.server.schemas.endpoints.chat import ChatCompletionCreate,ChatCompletionChunk,ChatCompletionObject, Usage
+from ktransformers.server.schemas.endpoints.chat import ChatCompletionCreate
+from ktransformers.server.schemas.endpoints.chat import RawUsage
 from ktransformers.server.backend.base import BackendInterfaceBase
 from ktransformers.server.config.config import Config
 
+from ktransformers.server.schemas.endpoints.chat import ChatCompletionChunk
+from openai.types.chat import ChatCompletion
+from openai.types.completion_usage import  CompletionUsage
+
+
 router = APIRouter()
 
 @router.get('/models', tags=['openai'])
@@ -29,15 +35,76 @@ async def chat_completion(request:Request,create:ChatCompletionCreate):
         assert request.headers.get('Authorization', '').split()[-1] == Config().api_key
 
     if create.stream:
+        from openai.types.chat.chat_completion_chunk import Choice, ChoiceDelta
+        
         async def inner():
-            chunk = ChatCompletionChunk(id=id,object='chat.completion.chunk',created=int(time()))
+            chunk = ChatCompletionChunk(
-            async for token in interface.inference(input_message,id,create.temperature,create.top_p):
+                id = id,
-                chunk.set_token(token)
+                choices = [],
+                object = 'chat.completion.chunk',
+                created = int(time()),
+                model = Config().model_name,
+            )
+            
+            async for res in interface.inference(input_message,id, create.temperature, create.top_p):
+                if isinstance(res, RawUsage):
+                    # at the end of inference, interface.inference() will return the usage of inference
+                    raw_usage = res
+                    chunk.choices = []
+                    chunk.usage = CompletionUsage(
+                        prompt_tokens = raw_usage.prefill_count,
+                        completion_tokens = raw_usage.decode_count,
+                        total_tokens = raw_usage.prefill_count + raw_usage.decode_count
+                    )
+
                     yield chunk
+
+                else:
+                    token, finish_reason = res
+                    choice = Choice(
+                        index = 0,
+                        delta = ChoiceDelta(content=token, role=None, tool_calls=None),
+                        finish_reason = finish_reason,
+                        logprobs = None,
+                    )
+                    chunk.choices = [choice]
+                    yield chunk
+
         return chat_stream_response(request, inner())
     else:
-        comp = ChatCompletionObject(id=id,object='chat.completion',created=int(time()))
+        from openai.types.chat.chat_completion import Choice
-        comp.usage = Usage(completion_tokens=1, prompt_tokens=1, total_tokens=2)
+        from openai.types.chat.chat_completion_message import ChatCompletionMessage
-        async for token in interface.inference(input_message,id,create.temperature,create.top_p):
+
-            comp.append_token(token)
+        content = ""
-        return comp
+        finish_reason = None
+        async for res in interface.inference(input_message,id,create.temperature,create.top_p):
+            if isinstance(res, RawUsage):
+                raw_usage = res
+                usage = CompletionUsage(
+                    prompt_tokens = raw_usage.prefill_count,
+                    completion_tokens = raw_usage.decode_count,
+                    total_tokens = raw_usage.prefill_count + raw_usage.decode_count
+                )
+            else:
+                token, finish_reason = res
+                content = content + token
+                finish_reason = finish_reason
+
+        choice = Choice(
+            index = 0,
+            finish_reason = finish_reason,
+            message = ChatCompletionMessage(
+                content=content,
+                role="assistant"
+            ))
+
+        chat_completion = ChatCompletion(
+            id = id,
+            choices = [choice],
+            created = int(time()),
+            model = Config().model_name,
+            object = 'chat.completion',
+            usage = usage
+        )
+
+        return chat_completion

ktransformers/server/api/openai/legacy/completions.py

@@ -6,6 +6,7 @@ from fastapi.requests import Request
 from ktransformers.server.utils.create_interface import get_interface
 from ktransformers.server.schemas.assistants.streaming import stream_response
 from ktransformers.server.schemas.legacy.completions import CompletionCreate,CompletionObject
+from ktransformers.server.schemas.endpoints.chat import RawUsage
 
 router = APIRouter()
 
@@ -17,10 +18,13 @@ async def create_completion(request:Request,create:CompletionCreate):
     print(f'COMPLETION INPUT:----\n{create.prompt}\n----')
 
    
-
     if create.stream:
         async def inner():
-            async for token in interface.inference(create.prompt,id,create.temperature,create.top_p):     
+            async for res in interface.inference(create.prompt,id,create.temperature,create.top_p):     
+                if isinstance(res, RawUsage):
+                    raw_usage = res
+                else: 
+                    token, finish_reason = res
                     d = {'choices':[{'delta':{'content':token}}]}
                     yield f"data:{json.dumps(d)}\n\n"
             d = {'choices':[{'delta':{'content':''},'finish_reason':''}]}
@@ -28,6 +32,10 @@ async def create_completion(request:Request,create:CompletionCreate):
         return stream_response(request,inner())
     else:
         comp = CompletionObject(id=id,object='text_completion',created=int(time()))
-        async for token in interface.inference(create.prompt,id,create.temperature,create.top_p):     
+        async for res in interface.inference(create.prompt,id,create.temperature,create.top_p):     
+            if isinstance(res, RawUsage):
+                raw_usage = res
+            else: 
+                token, finish_reason = res
                 comp.append_token(token) 
         return comp

ktransformers/server/backend/base.py

@@ -142,7 +142,7 @@ class ThreadContext:
         yield reply_message.stream_response_with_event(MessageObject.Status.in_progress)
         yield self.run.stream_response_with_event(RunObject.Status.in_progress)
 
-        async for token in self.interface.inference(local_messages,self.thread.id):     
+        async for token, finish_reason in self.interface.inference(local_messages,self.thread.id):     
             if self.run.status == RunObject.Status.cancelling:
                 logger.warn(f'Run {self.run.id} cancelling')
                 break

ktransformers/server/backend/interfaces/ktransformers.py

@@ -16,6 +16,7 @@ from ktransformers.local_chat import custom_models, default_optimize_rules
 from ktransformers.util.utils import get_device
 from typing import Optional
 from ktransformers.operators.flashinfer_wrapper import flashinfer_enabled, MLAWrapperSingleton
+from ktransformers.server.schemas.endpoints.chat import RawUsage
 
 warm_uped = False
 
@@ -231,3 +232,12 @@ class KTransformersInterface(TransformersInterface):
         async with self._infer_lock:
             async for v in super().inference(local_messages, thread_id, temperature, top_p):
                 yield v
+            
+            # return this inference raw usage
+            yield RawUsage(
+                tokenize_time = self.profiler.get_timer_sec('tokenize'),
+                prefill_time = self.profiler.get_timer_sec('prefill'),
+                decode_time = self.profiler.get_timer_sec('decode'),
+                prefill_count = self.profiler.get_counter('prefill'),
+                decode_count = self.profiler.get_counter('decode'),
+            )

ktransformers/server/backend/interfaces/transformers.py

@@ -333,7 +333,7 @@ class TransformersInterface(BackendInterfaceBase):
         logger.info(f"args.max_new_tokens: {self.args.max_new_tokens}, cache_lens: {self.args.cache_lens}, seq_length: {self.seq_length}")
         if(self.max_new_tokens <= 0):
             logger.warning("max_new_tokens is less than 0")
-            yield self.streamer.end()
+            yield self.streamer.end(), "length"
             return
         logger.info(f"max_new_tokens: {self.max_new_tokens}")
         self.profiler.set_counter("decode", 0)
@@ -348,10 +348,17 @@ class TransformersInterface(BackendInterfaceBase):
                 next_token = self.decode_one_tokens()
                 self.profiler.inc("decode")
                 if next_token == self.tokenizer.eos_token_id or "<|im_end|>" == self.tokenizer.decode(next_token):
+                    yield self.streamer.end(), None
+                    yield "", "stop"
                     assert self.args.batch_size == 1
                     break
-                yield self.append_new_tokens(next_token)
+                yield self.append_new_tokens(next_token), None
-        yield self.streamer.end()
+
+        else:   # for's else, if output get max new tokens
+            yield self.streamer.end(), None
+            yield "", "length"
+        
+        
 
     def check_is_new(self, thread_id: str):
         if not self.use_static_cache:
@@ -391,20 +398,20 @@ class TransformersInterface(BackendInterfaceBase):
         if Config().user_force_think:
             think = '<think>\n'
             print(think, end="",flush=True)
-            yield think
+            yield think, None
         
         for t in self.prefill(input_ids, self.check_is_new(thread_id), temperature, top_p):
             # output think token after prefill done
             if t is not None:
                 print(t, end="",flush=True)
-                yield t
+                yield t, None
         self.profiler.pause_timer("prefill")
 
         self.profiler.create_and_start_timer("decode")
-        for t in self.generate():
+        for t, finish_reason in self.generate():
             if t is not None:
                 print(t, end="",flush=True)
-                yield t 
+                yield t, finish_reason
         print("")
         self.profiler.pause_timer("decode")
         self.report_last_time_performance()

ktransformers/server/requirements.txt

@@ -5,6 +5,7 @@ langchain >= 0.2.0
 blessed >= 1.20.0
 accelerate >= 0.31.0
 sentencepiece >= 0.1.97
+openai
 setuptools
 build
 ninja

ktransformers/server/schemas/endpoints/chat.py

@@ -1,10 +1,15 @@
 from typing import List, Optional
+from typing_extensions import Literal
 from enum import Enum
 
 from pydantic import BaseModel
 
 from ktransformers.server.schemas.base import Object
 
+from openai.types.completion_usage import CompletionUsage
+from openai.types.chat.chat_completion_chunk import Choice
+
+
 class Role(Enum):
     system = 'system'
     user = 'user'
@@ -31,50 +36,25 @@ class ChatCompletionCreate(BaseModel):
     def get_tokenizer_messages(self):
         return [m.to_tokenizer_message() for m in self.messages]
 
-class FinishReason(Enum):
-    stop = 'stop'
-    length = 'length'
 
-class Choice(BaseModel):
+class ChatCompletionChunk(BaseModel):
-    index: int
+    id: str
-    message: Message
+    choices: List[Choice]
-    logprobs: Optional[str] = None
-    finish_reason: FinishReason = None
-
-class DeltaChoice(BaseModel):
-    index: int
-    delta: Message
-    logprobs: Optional[str] = None
-    finish_reason: FinishReason = None
-
-
-class Usage(BaseModel):
-    completion_tokens:int
-    prompt_tokens:int
-    total_tokens:int
-
-
-class ChatCompletionBase(Object):
     created: int
-    model:str = 'not implmented'
+    model: str
-    system_fingerprint:str = 'not implmented'
+    object: Literal["chat.completion.chunk"]
-    usage: Optional[Usage] = None
+    service_tier: Optional[Literal["scale", "default"]] = None
+    system_fingerprint: Optional[str] = None
+    usage: Optional[CompletionUsage] = None
 
-class ChatCompletionObject(ChatCompletionBase):
-    choices:List[Choice] = []
-
-    def append_token(self,token:str):
-        if len(self.choices) == 0:
-            self.choices.append(Choice(index=0,message=Message(content='',role=Role.assistant)))
-        self.choices[0].message.content += token
-
-class ChatCompletionChunk(ChatCompletionBase):
-    choices:List[DeltaChoice] = []
-
-    def set_token(self,token:str):
-        self.choices = [
-            DeltaChoice(index=0,delta=Message(content=token,role=Role.assistant))
-        ]
 
     def to_stream_reply(self):
         return f"data: {self.model_dump_json()}\n\n"
+
+
+class RawUsage(BaseModel):
+    tokenize_time: float
+    prefill_time: float
+    decode_time: float
+    prefill_count: int
+    decode_count: int