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296 lines
11 KiB
Python
296 lines
11 KiB
Python
import asyncio
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import collections
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import time
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from asyncio import exceptions
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from typing import Optional
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import aiohttp
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import numpy as np
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import openai
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from openai.types.chat.chat_completion import ChatCompletion
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from openai.types.completion import Completion
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from pydantic import BaseModel, Field
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from tenacity import retry, stop_after_attempt, wait_random_exponential
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class OpenaiConfig(BaseModel):
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"""
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Configuration for the server manager.
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"""
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api_key: Optional[str] = Field(
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default=None, description="API key for OpenAI API. Use 'x' for local servers."
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)
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base_url: Optional[str] = Field(
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default=None,
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description="URL of the API endpoint. None if using official OpenAI API, otherwise local server URL.",
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)
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timeout: int = Field(
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default=1200, description="Timeout for the request in seconds."
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)
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num_max_requests_at_once: int = Field(
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default=512,
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description="Maximum number of concurrent requests. Note: You should divide this by the n kwarg.",
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)
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num_requests_for_eval: int = Field(
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default=64, description="Maximum number of concurrent requests for evaluation."
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)
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model_name: str = Field(
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default="default",
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description="The model name to use. Required for both OpenAI and local models.",
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)
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rolling_buffer_length: int = Field(
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default=1000, description="Length of the rolling buffer to store metrics."
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)
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class AsyncSemWithAdaptiveWeight(asyncio.Semaphore):
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def __init__(self, value: int):
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super().__init__(value=value)
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self.max_val = value
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self.weight = 1.0
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def update_weight(self, weight: float) -> None:
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self.weight = weight
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def min_val(self):
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return self.max_val * (1.0 - self.weight)
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def release(self):
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"""Release a semaphore, incrementing the internal counter by one.
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When it was zero on entry and another coroutine is waiting for it to
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become larger than zero again, wake up that coroutine.
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If weight is set, it'll only wake up next if the value is greater than the max_val * weight
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"""
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self._value += 1
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if self._value > self.min_val():
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self._wake_up_next()
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def locked(self):
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"""Returns True if semaphore cannot be acquired immediately."""
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return self._value <= self.min_val() or (
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any(not w.cancelled() for w in (self._waiters or ()))
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)
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async def acquire(self):
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"""Acquire a semaphore.
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If the internal counter is larger than zero on entry,
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decrement it by one and return True immediately. If it is
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zero on entry, block, waiting until some other coroutine has
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called release() to make it larger than 0, and then return
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True.
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"""
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if not self.locked():
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self._value -= 1
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return True
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if self._waiters is None:
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self._waiters = collections.deque()
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fut = self._get_loop().create_future()
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self._waiters.append(fut)
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# Finally block should be called before the CancelledError
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# handling as we don't want CancelledError to call
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# _wake_up_first() and attempt to wake up itself.
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try:
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try:
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await fut
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finally:
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self._waiters.remove(fut)
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except exceptions.CancelledError:
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if not fut.cancelled():
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self._value += 1
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self._wake_up_next()
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raise
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if self._value > self.min_val():
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self._wake_up_next()
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return True
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class OpenAIServer:
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def __init__(self, config: OpenaiConfig):
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self.config = config
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self.openai = openai.AsyncClient(
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api_key=config.api_key,
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base_url=config.base_url,
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timeout=config.timeout,
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)
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self.sem = AsyncSemWithAdaptiveWeight(config.num_max_requests_at_once)
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self.eval_sem = AsyncSemWithAdaptiveWeight(config.num_requests_for_eval)
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self.server_healthy = True
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self.attempts_list = []
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self.request_timings = []
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# in case eval is much different, we should keep different buffers
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self.eval_attempts_list = []
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self.eval_request_timings = []
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self.check_task = None
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self.initialized = False
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async def update_weight(self, weight: float) -> None:
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# need to update sems
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self.sem.update_weight(weight)
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self.eval_sem.update_weight(weight)
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async def check_server_status_task(self):
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while True:
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try:
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await self.openai.completions.create(
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model=self.config.model_name,
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prompt="hi",
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max_tokens=1,
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)
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self.server_healthy = True
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except (
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aiohttp.ClientError,
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openai.OpenAIError,
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openai.APITimeoutError,
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Exception,
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):
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self.server_healthy = False
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await asyncio.sleep(1)
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async def wandb_metrics(
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self, metrics_dict: Optional[dict], server_name: Optional[str]
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):
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if server_name is None:
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server_name = "server"
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if len(self.request_timings) > 0:
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metrics_dict[f"server/{server_name}_request_time_avg"] = np.mean(
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self.request_timings
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)
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metrics_dict[f"server/{server_name}_request_time_std"] = np.std(
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self.request_timings
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)
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metrics_dict[f"server/{server_name}_request_time_99p"] = np.percentile(
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self.request_timings, 99
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)
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if len(self.eval_request_timings) > 0:
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metrics_dict[f"server/{server_name}_eval_request_time_avg"] = np.mean(
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self.eval_request_timings
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)
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metrics_dict[f"server/{server_name}_eval_request_time_std"] = np.std(
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self.eval_request_timings
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)
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metrics_dict[f"server/{server_name}_eval_request_time_99p"] = np.percentile(
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self.eval_request_timings, 99
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)
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if len(self.attempts_list) > 0:
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metrics_dict[f"server/{server_name}_average_num_attempts"] = np.mean(
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self.attempts_list
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)
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if len(self.eval_attempts_list) > 0:
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metrics_dict[f"server/{server_name}_eval_retry_rate"] = np.mean(
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self.eval_attempts_list
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)
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return metrics_dict
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@retry(
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stop=stop_after_attempt(3), wait=wait_random_exponential(multiplier=1, max=10)
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)
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async def _chat_comp(self, stat_dict, **kwargs) -> ChatCompletion:
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while not self.server_healthy:
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await asyncio.sleep(1)
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async with self.sem:
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if stat_dict.get("start", None) is None:
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stat_dict["start"] = time.time()
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stat_dict["attempts"] += 1
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completions = await self.openai.chat.completions.create(**kwargs)
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stat_dict["end"] = time.time()
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return completions
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@retry(
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stop=stop_after_attempt(3), wait=wait_random_exponential(multiplier=1, max=10)
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)
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async def _chat_eval(self, stat_dict, **kwargs) -> ChatCompletion:
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while not self.server_healthy:
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await asyncio.sleep(1)
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async with self.eval_sem:
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if stat_dict.get("start", None) is None:
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stat_dict["start"] = time.time()
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stat_dict["attempts"] += 1
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completions = await self.openai.chat.completions.create(**kwargs)
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stat_dict["end"] = time.time()
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return completions
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@retry(
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stop=stop_after_attempt(3), wait=wait_random_exponential(multiplier=1, max=10)
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)
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async def chat_completion(self, **kwargs) -> ChatCompletion:
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if not self.initialized:
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if (
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self.config.base_url is not None
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): # skip health check if using OpenAI API
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self.check_task = asyncio.create_task(self.check_server_status_task())
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else:
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self.server_healthy = True
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self.initialized = True
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kwargs["model"] = self.config.model_name
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split = kwargs.pop("split", "train")
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stat_dict = {}
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stat_dict["attempts"] = 0
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if split == "train":
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ret_data = await self._chat_comp(stat_dict, **kwargs)
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self.request_timings.append(stat_dict["end"] - stat_dict["start"])
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self.attempts_list.append(stat_dict["attempts"])
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else:
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# Give separate eval workers, if desired, gotta go fast for those evals
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ret_data = await self._chat_eval(stat_dict, **kwargs)
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self.eval_request_timings.append(stat_dict["end"] - stat_dict["start"])
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self.eval_attempts_list.append(stat_dict["attempts"])
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return ret_data
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@retry(
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stop=stop_after_attempt(3), wait=wait_random_exponential(multiplier=1, max=10)
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)
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async def _comp(self, stat_dict, **kwargs) -> Completion:
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while not self.server_healthy:
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await asyncio.sleep(1)
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async with self.sem:
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if stat_dict.get("start", None) is None:
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stat_dict["start"] = time.time()
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stat_dict["attempts"] += 1
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completions = await self.openai.completions.create(**kwargs)
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stat_dict["end"] = time.time()
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return completions
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@retry(
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stop=stop_after_attempt(3), wait=wait_random_exponential(multiplier=1, max=10)
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)
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async def _comp_eval(self, stat_dict, **kwargs) -> Completion:
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while not self.server_healthy:
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await asyncio.sleep(1)
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async with self.eval_sem:
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if stat_dict.get("start", None) is None:
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stat_dict["start"] = time.time()
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stat_dict["attempts"] += 1
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completions = await self.openai.completions.create(**kwargs)
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stat_dict["end"] = time.time()
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return completions
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async def completion(self, **kwargs) -> Completion:
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if not self.initialized:
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if (
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self.config.base_url is not None
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): # skip health check if using OpenAI API
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self.check_task = asyncio.create_task(self.check_server_status_task())
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else:
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self.server_healthy = True
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self.initialized = True
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kwargs["model"] = self.config.model_name
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split = kwargs.pop("split", "train")
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stat_dict = {}
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stat_dict["attempts"] = 0
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if split == "train":
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ret_data = await self._comp(stat_dict, **kwargs)
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self.request_timings.append(stat_dict["end"] - stat_dict["start"])
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self.attempts_list.append(stat_dict["attempts"])
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else:
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# Give separate eval workers, if desired, gotta go fast for those evals
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ret_data = await self._comp_eval(stat_dict, **kwargs)
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self.eval_request_timings.append(stat_dict["end"] - stat_dict["start"])
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self.eval_attempts_list.append(stat_dict["attempts"])
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return ret_data
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