QChatGPT/pkg/openai/modelmgr.py

"""OpenAI 接口底层封装

目前使用的对话接口有：
ChatCompletion - gpt-3.5-turbo 等模型
Completion - text-davinci-003 等模型
此模块封装此两个接口的请求实现，为上层提供统一的调用方式
"""
import openai, logging, threading, asyncio
import openai.error as aiE
import tiktoken

from pkg.openai.api.model import RequestBase
from pkg.openai.api.completion import CompletionRequest
from pkg.openai.api.chat_completion import ChatCompletionRequest

COMPLETION_MODELS = {
    'text-davinci-003',
    'text-davinci-002',
    'code-davinci-002',
    'code-cushman-001',
    'text-curie-001',
    'text-babbage-001',
    'text-ada-001',
}

CHAT_COMPLETION_MODELS = {
    'gpt-3.5-turbo',
    'gpt-3.5-turbo-16k',
    'gpt-3.5-turbo-0613',
    'gpt-3.5-turbo-16k-0613',
    # 'gpt-3.5-turbo-0301',
    'gpt-4',
    'gpt-4-0613',
    'gpt-4-32k',
    'gpt-4-32k-0613'
}

EDIT_MODELS = {

}

IMAGE_MODELS = {

}


def select_request_cls(model_name: str, messages: list, args: dict) -> RequestBase:
    if model_name in CHAT_COMPLETION_MODELS:
        return ChatCompletionRequest(model_name, messages, **args)
    elif model_name in COMPLETION_MODELS:
        return CompletionRequest(model_name, messages, **args)
    raise ValueError("不支持模型[{}]，请检查配置文件".format(model_name))


def count_chat_completion_tokens(messages: list, model: str) -> int:
    """Return the number of tokens used by a list of messages."""
    try:
        encoding = tiktoken.encoding_for_model(model)
    except KeyError:
        print("Warning: model not found. Using cl100k_base encoding.")
        encoding = tiktoken.get_encoding("cl100k_base")
    if model in {
        "gpt-3.5-turbo-0613",
        "gpt-3.5-turbo-16k-0613",
        "gpt-4-0314",
        "gpt-4-32k-0314",
        "gpt-4-0613",
        "gpt-4-32k-0613",
        }:
        tokens_per_message = 3
        tokens_per_name = 1
    elif model == "gpt-3.5-turbo-0301":
        tokens_per_message = 4  # every message follows <|start|>{role/name}\n{content}<|end|>\n
        tokens_per_name = -1  # if there's a name, the role is omitted
    elif "gpt-3.5-turbo" in model:
        # print("Warning: gpt-3.5-turbo may update over time. Returning num tokens assuming gpt-3.5-turbo-0613.")
        return count_chat_completion_tokens(messages, model="gpt-3.5-turbo-0613")
    elif "gpt-4" in model:
        # print("Warning: gpt-4 may update over time. Returning num tokens assuming gpt-4-0613.")
        return count_chat_completion_tokens(messages, model="gpt-4-0613")
    else:
        raise NotImplementedError(
            f"""count_chat_completion_tokens() is not implemented for model {model}. See https://github.com/openai/openai-python/blob/main/chatml.md for information on how messages are converted to tokens."""
        )
    num_tokens = 0
    for message in messages:
        num_tokens += tokens_per_message
        for key, value in message.items():
            num_tokens += len(encoding.encode(value))
            if key == "name":
                num_tokens += tokens_per_name
    num_tokens += 3  # every reply is primed with <|start|>assistant<|message|>
    return num_tokens


def count_completion_tokens(messages: list, model: str) -> int:

    try:
        encoding = tiktoken.encoding_for_model(model)
    except KeyError:
        print("Warning: model not found. Using cl100k_base encoding.")
        encoding = tiktoken.get_encoding("cl100k_base")

    text = ""

    for message in messages:
        text += message['role'] + message['content'] + "\n"

    text += "assistant: "

    return len(encoding.encode(text))


def count_tokens(messages: list, model: str):
    if model in CHAT_COMPLETION_MODELS:
        return count_chat_completion_tokens(messages, model)
    elif model in COMPLETION_MODELS:
        return count_completion_tokens(messages, model)
    raise ValueError("不支持模型[{}]，请检查配置文件".format(model))