perf: 压缩上下文

This commit is contained in:
archer
2023-04-07 01:11:23 +08:00
parent 1409916bd0
commit 9c8ca7dd25
3 changed files with 18 additions and 180 deletions

View File

@@ -60,10 +60,9 @@ export const chatProblem = `
`;
export const versionIntro = `
## Fast GPT V2.4
* 优化文件拆分功能,可自定义提示词
* 优化文件拆分和索引生成的速度
* 定制知识库:创建模型时可以选择【知识库】模型, 可以手动导入知识点或者直接导入一个文件自动学习。
## Fast GPT V2.5
* 内容压缩替换中文标点符号和多余符号减少一些上下文tokens
* 优化 QA 拆分记账
`;
export const shareHint = `

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@@ -1,170 +0,0 @@
import type { NextApiRequest, NextApiResponse } from 'next';
import { createParser, ParsedEvent, ReconnectInterval } from 'eventsource-parser';
import { connectToDatabase } from '@/service/mongo';
import { getOpenAIApi, authChat } from '@/service/utils/chat';
import { httpsAgent } from '@/service/utils/tools';
import { ChatItemType } from '@/types/chat';
import { jsonRes } from '@/service/response';
import type { ModelSchema } from '@/types/mongoSchema';
import { PassThrough } from 'stream';
import { modelList } from '@/constants/model';
import { pushChatBill } from '@/service/events/pushBill';
/* 发送提示词 */
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
let step = 0; // step=1时表示开始了流响应
const stream = new PassThrough();
stream.on('error', () => {
console.log('error: ', 'stream error');
stream.destroy();
});
res.on('close', () => {
stream.destroy();
});
res.on('error', () => {
console.log('error: ', 'request error');
stream.destroy();
});
try {
const { chatId, prompt } = req.body as {
prompt: ChatItemType;
chatId: string;
};
const { authorization } = req.headers;
if (!chatId || !prompt) {
throw new Error('缺少参数');
}
await connectToDatabase();
const { chat, userApiKey, systemKey, userId } = await authChat(chatId, authorization);
const model: ModelSchema = chat.modelId;
// 读取对话内容
const prompts = [...chat.content, prompt];
// 上下文长度过滤
const maxContext = model.security.contextMaxLen;
const filterPrompts =
prompts.length > maxContext ? prompts.slice(prompts.length - maxContext) : prompts;
// 格式化文本内容
const formatPrompts: string[] = filterPrompts.map((item: ChatItemType) => item.value);
// 如果有系统提示词,自动插入
if (model.systemPrompt) {
formatPrompts.unshift(`${model.systemPrompt}`);
}
const promptText = formatPrompts.join('</s>');
// 计算温度
const modelConstantsData = modelList.find((item) => item.model === model.service.modelName);
if (!modelConstantsData) {
throw new Error('模型异常,请用 chatgpt 模型');
}
const temperature = modelConstantsData.maxTemperature * (model.temperature / 10);
// 获取 chatAPI
const chatAPI = getOpenAIApi(userApiKey || systemKey);
let startTime = Date.now();
// console.log({
// model: model.service.chatModel,
// temperature: temperature,
// prompt: promptText,
// stream: true,
// max_tokens:
// model.trainingTimes > 0 ? modelConstantsData.trainedMaxToken : modelConstantsData.maxToken,
// presence_penalty: -0.5, // 越大,越容易出现新内容
// frequency_penalty: 0.5, // 越大,重复内容越少
// stop: [`###`]
// });
// 发出请求
const chatResponse = await chatAPI.createCompletion(
{
model: model.service.chatModel,
temperature: temperature,
prompt: promptText,
stream: true,
max_tokens: modelConstantsData.maxToken,
presence_penalty: -0.5, // 越大,越容易出现新内容
frequency_penalty: 0.5, // 越大,重复内容越少
stop: [`###`, '。!?.!.']
},
{
timeout: 40000,
responseType: 'stream',
httpsAgent
}
);
console.log('api response time:', `${(Date.now() - startTime) / 1000}s`);
// 创建响应流
res.setHeader('Content-Type', 'text/event-stream;charset-utf-8');
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('X-Accel-Buffering', 'no');
res.setHeader('Cache-Control', 'no-cache, no-transform');
step = 1;
let responseContent = '';
stream.pipe(res);
const onParse = async (event: ParsedEvent | ReconnectInterval) => {
if (event.type !== 'event') return;
const data = event.data;
if (data === '[DONE]') return;
try {
const json = JSON.parse(data);
const content: string = json?.choices?.[0].text || '';
// console.log('content:', content);
if (!content || (responseContent === '' && content === '\n')) return;
responseContent += content;
!stream.destroyed && stream.push(content.replace(/\n/g, '<br/>'));
} catch (error) {
error;
}
};
const decoder = new TextDecoder();
try {
for await (const chunk of chatResponse.data as any) {
if (stream.destroyed) {
// 流被中断了,直接忽略后面的内容
break;
}
const parser = createParser(onParse);
parser.feed(decoder.decode(chunk));
}
} catch (error) {
console.log('pipe error', error);
}
// close stream
!stream.destroyed && stream.push(null);
stream.destroy();
// 只有使用平台的 key 才计费
pushChatBill({
isPay: !userApiKey,
modelName: model.service.modelName,
userId,
chatId,
text: promptText + responseContent
});
} catch (err: any) {
// console.log(err?.response);
if (step === 1) {
// 直接结束流
console.log('error结束');
stream.destroy();
} else {
res.status(500);
jsonRes(res, {
code: 500,
error: err
});
}
}
}

View File

@@ -54,21 +54,30 @@ export const httpsAgent =
/* tokens 截断 */
export const openaiChatFilter = (prompts: ChatItemType[], maxTokens: number) => {
const formatPrompts = prompts.map((item) => ({
obj: item.obj,
value: item.value
.replace(/[\u3000\u3001\uff01-\uff5e\u3002]/g, ' ') // 中文标点改空格
.replace(/\n+/g, '\n') // 连续空行
.replace(/[^\S\r\n]+/g, ' ') // 连续空白内容
.trim()
}));
let res: ChatItemType[] = [];
let systemPrompt: ChatItemType | null = null;
// System 词保留
if (prompts[0]?.obj === 'SYSTEM') {
systemPrompt = prompts.shift() as ChatItemType;
maxTokens -= encode(prompts[0].value).length;
if (formatPrompts[0]?.obj === 'SYSTEM') {
systemPrompt = formatPrompts.shift() as ChatItemType;
maxTokens -= encode(formatPrompts[0].value).length;
}
// 从后往前截取
for (let i = prompts.length - 1; i >= 0; i--) {
const tokens = encode(prompts[i].value).length;
for (let i = formatPrompts.length - 1; i >= 0; i--) {
const tokens = encode(formatPrompts[i].value).length;
if (maxTokens >= tokens) {
res.unshift(prompts[i]);
res.unshift(formatPrompts[i]);
maxTokens -= tokens;
} else {
break;