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416 lines
13 KiB
Python
416 lines
13 KiB
Python
"""Client class."""
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import asyncio
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import copy
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import logging
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import math
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from abc import ABC, abstractmethod
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from typing import Any, Dict, List, Optional, Tuple, Union, cast
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import aiohttp
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import requests
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from tenacity import RetryCallState, retry, stop_after_attempt, wait_random_exponential
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from manifest.request import (
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DEFAULT_REQUEST_KEYS,
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NOT_CACHE_KEYS,
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LMScoreRequest,
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Request,
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)
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from manifest.response import (
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RESPONSE_CONSTRUCTORS,
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ArrayModelChoice,
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LMModelChoice,
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ModelChoices,
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Response,
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Usage,
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Usages,
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)
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logger = logging.getLogger(__name__)
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def retry_if_ratelimit(retry_base: RetryCallState) -> bool:
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"""Return whether to retry if ratelimited."""
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try:
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if isinstance(retry_base.outcome.exception(), requests.exceptions.HTTPError):
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exception = cast(
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requests.exceptions.HTTPError, retry_base.outcome.exception()
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)
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if exception.response.status_code == 429: # type: ignore
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return True
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except Exception:
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pass
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return False
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class Client(ABC):
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"""Client class."""
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# Must be overridden by child class
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PARAMS: Dict[str, Tuple[str, Any]] = {}
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REQUEST_CLS = Request
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NAME: str = None
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def __init__(
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self, connection_str: Optional[str] = None, client_args: Dict[str, Any] = {}
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):
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"""
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Initialize client.
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kwargs are passed to client as default parameters.
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For clients like OpenAI that do not require a connection,
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the connection_str can be None.
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Args:
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connection_str: connection string for client.
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client_args: client arguments.
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"""
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self.connect(connection_str, client_args)
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@abstractmethod
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def connect(
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self, connection_str: Optional[str], client_args: Dict[str, Any]
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) -> None:
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"""
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Connect to client.
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Args:
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connection_str: connection string.
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"""
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raise NotImplementedError()
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@abstractmethod
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def close(self) -> None:
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"""Close the client."""
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raise NotImplementedError()
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@abstractmethod
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def get_generation_url(self) -> str:
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"""Get generation URL."""
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raise NotImplementedError()
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@abstractmethod
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def get_generation_header(self) -> Dict[str, str]:
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"""
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Get generation header.
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Returns:
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header.
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"""
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raise NotImplementedError()
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@abstractmethod
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def supports_batch_inference(self) -> bool:
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"""Return whether the client supports batch inference."""
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raise NotImplementedError()
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@abstractmethod
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def get_model_params(self) -> Dict:
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"""
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Get model params.
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By getting model params from the server, we can add to request
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and make sure cache keys are unique to model.
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Returns:
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model params.
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"""
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raise NotImplementedError()
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def get_model_inputs(self) -> List:
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"""
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Get allowable model inputs.
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Returns:
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model inputs.
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"""
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return list(self.PARAMS.keys())
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def get_request(
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self, prompt: Union[str, List[str]], request_args: Dict[str, Any]
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) -> Request:
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"""
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Parse model kwargs to request.
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Args:
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prompt: prompt.
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request_args: request arguments.
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Returns:
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request.
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"""
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params = {"prompt": prompt}
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# Adds default values from self.PARAMS if not in request_args
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for key in self.PARAMS:
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params[key] = request_args.pop(key, getattr(self, key))
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# Allows for overriding DEFAULT_REQUEST_KEYS even if they are not
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# in self.PARAMS. Note that DEFAULT_REQUEST_KEYS match the default
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# values in Request.
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for key in DEFAULT_REQUEST_KEYS:
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if key not in params and key in request_args:
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params[key] = request_args.pop(key)
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return self.REQUEST_CLS(**params) # type: ignore
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def get_request_params(self, request: Request) -> Dict[str, Any]:
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"""Get request params.
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Add default keys that we need for requests such as batch_size.
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We drop these before sending to the model.
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"""
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params_to_add = DEFAULT_REQUEST_KEYS.copy()
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# This will override DEFAULT_REQUEST_KEYS with those in PARAMS
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params_to_add.update(self.PARAMS)
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# to_dict will handle parameter renaming but not any
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# default value handling - that is done in get_request()
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request_params = request.to_dict(params_to_add)
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return request_params
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def get_cache_key(self, request: Request) -> Dict[str, Any]:
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"""Get cache key for request.
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Skip keys that are not cache keys such as batch_size.
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"""
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request_params = self.get_request_params(request)
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for key in NOT_CACHE_KEYS:
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request_params.pop(key, None)
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# Make sure to add model params and request class
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request_params.update(self.get_model_params())
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request_params["request_cls"] = request.__class__.__name__
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return request_params
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def split_usage(self, request: Dict, choices: List[str]) -> List[Dict[str, int]]:
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"""Split usage into list of usages for each prompt."""
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return []
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def get_model_choices(self, response: Dict) -> ModelChoices:
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"""Format response to ModelChoices."""
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# Array or text response
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response_type = RESPONSE_CONSTRUCTORS[self.REQUEST_CLS]["response_type"]
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if response_type == "array":
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choices: List[Union[LMModelChoice, ArrayModelChoice]] = [
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ArrayModelChoice(**choice) for choice in response["choices"]
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]
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else:
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choices = [LMModelChoice(**choice) for choice in response["choices"]]
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return ModelChoices(choices=choices)
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def validate_response(self, response: Dict, request: Dict) -> Dict[str, Any]:
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"""
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Validate response as dict.
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Args:
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response: response
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request: request
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Return:
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response as dict
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"""
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if "choices" not in response:
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raise ValueError(f"Invalid response: {response}")
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if "usage" in response:
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# Handle splitting the usages for batch requests
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if len(response["choices"]) == 1:
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if isinstance(response["usage"], list):
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response["usage"] = response["usage"][0]
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response["usage"] = [response["usage"]]
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else:
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# Try to split usage
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split_usage = self.split_usage(request, response["choices"])
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if split_usage:
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response["usage"] = split_usage
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return response
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def split_requests(
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self, request_params: Dict[str, Any], batch_size: int, key: str = "prompt"
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) -> List[Dict[str, Any]]:
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"""Split request into batch_sized request.
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Args:
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request_params: request params.
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batch_size: batch size for requests.
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key: key to batch over
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Returns:
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list of request params.
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"""
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data = copy.deepcopy(request_params[key])
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data_size = len(request_params[key])
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request_params_list = []
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for i in range(0, data_size, batch_size):
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params = copy.deepcopy(request_params)
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params[key] = data[i] if batch_size == 1 else data[i : i + batch_size]
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request_params_list.append(params)
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return request_params_list
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@retry(
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reraise=True,
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retry=retry_if_ratelimit,
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wait=wait_random_exponential(min=1, max=60),
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stop=stop_after_attempt(10),
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)
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def _run_completion(
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self, request_params: Dict[str, Any], retry_timeout: int
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) -> Dict:
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"""Execute completion request.
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Args:
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request_params: request params.
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retry_timeout: retry timeout.
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Returns:
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response as dict.
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"""
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post_str = self.get_generation_url()
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res = requests.post(
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post_str,
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headers=self.get_generation_header(),
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json=request_params,
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timeout=retry_timeout,
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)
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try:
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res.raise_for_status()
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except requests.exceptions.HTTPError:
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logger.error(res.json())
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raise requests.exceptions.HTTPError(res.json())
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return self.validate_response(res.json(), request_params)
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@retry(
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reraise=True,
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retry=retry_if_ratelimit,
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wait=wait_random_exponential(min=1, max=60),
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stop=stop_after_attempt(10),
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)
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async def _arun_completion(
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self, request_params: Dict[str, Any], retry_timeout: int, batch_size: int
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) -> Dict:
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"""Async execute completion request.
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Args:
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request_params: request params.
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retry_timeout: retry timeout.
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batch_size: batch size for requests.
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Returns:
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response as dict.
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"""
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post_str = self.get_generation_url()
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async with aiohttp.ClientSession(timeout=retry_timeout) as session:
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async with session.post(
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post_str,
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headers=self.get_generation_header(),
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json=request_params,
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timeout=retry_timeout,
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) as res:
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res.raise_for_status()
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res_json = await res.json(content_type=None)
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return self.validate_response(res_json, request_params)
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def run_request(self, request: Request) -> Response:
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"""
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Get request string function.
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Args:
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request: request.
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Returns:
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response.
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"""
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if isinstance(request.prompt, list) and not self.supports_batch_inference():
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raise ValueError(
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f"{self.__class__.__name__} does not support batch inference."
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)
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request_params = self.get_request_params(request)
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# Take the default keys we need and drop the rest as they
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# are not part of the model request.
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retry_timeout = request_params.pop("client_timeout")
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for key in DEFAULT_REQUEST_KEYS:
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request_params.pop(key, None)
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response_dict = self._run_completion(request_params, retry_timeout)
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usages = None
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if "usage" in response_dict:
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usages = [Usage(**usage) for usage in response_dict["usage"]]
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return Response(
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response=self.get_model_choices(response_dict),
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cached=False,
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request=request,
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usages=Usages(usages=usages) if usages else None,
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**RESPONSE_CONSTRUCTORS[self.REQUEST_CLS], # type: ignore
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)
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async def arun_batch_request(self, request: Request) -> Response:
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"""
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Get async request string function.
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Args:
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request: request.
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Returns:
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response.
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"""
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required_batch_size = None
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if not self.supports_batch_inference():
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required_batch_size = 1
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if not isinstance(request.prompt, list):
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raise AssertionError(
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"request.prompt must be a list for async batch inference."
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)
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request_params = self.get_request_params(request)
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# Take the default keys we need and drop the rest as they
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# are not part of the model request.
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retry_timeout = request_params.pop("client_timeout")
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batch_size = request_params.pop("batch_size")
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batch_size = required_batch_size or batch_size
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for key in DEFAULT_REQUEST_KEYS:
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request_params.pop(key, None)
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num_batches = len(request.prompt) // batch_size
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if len(request.prompt) % batch_size != 0:
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batch_size = int(math.ceil(len(request.prompt) / (num_batches + 1)))
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request_batches = self.split_requests(request_params, batch_size)
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all_tasks = [
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asyncio.create_task(self._arun_completion(batch, retry_timeout, batch_size))
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for batch in request_batches
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]
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responses = await asyncio.gather(*all_tasks)
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# Flatten responses
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choices = []
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usages = []
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for res_dict in responses:
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choices.extend(res_dict["choices"])
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if "usage" in res_dict:
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usages.extend(res_dict["usage"])
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final_response_dict = {"choices": choices}
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final_usages = None
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if usages:
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final_usages = Usages(usages=[Usage(**usage) for usage in usages])
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return Response(
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self.get_model_choices(final_response_dict),
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cached=False,
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request=request,
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usages=final_usages,
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**RESPONSE_CONSTRUCTORS[self.REQUEST_CLS], # type: ignore
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)
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def get_score_prompt_request(
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self,
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request: LMScoreRequest,
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) -> Response:
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"""
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Get the logit score of the prompt via a forward pass of the model.
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Args:
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request: request.
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Returns:
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request function that takes no input.
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request parameters as dict.
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"""
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raise NotImplementedError(
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f"{self.__class__.__name__} does not support prompt scoring request."
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)
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