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91269c91a1
* fix: 修复最后一个流为[xxxx]格式时会重复输出1次 issue #5292 当最后一个流中包含[xxxx]格式时，会输出2次。第一次在parseCite方法中if (isStreamEnd) {分支内输出，第二次在调用getResponseData时会输出buffer中的内容，导致重复。 * add test case --------- Co-authored-by: archer <545436317@qq.com>
320 lines
10 KiB
TypeScript
320 lines
10 KiB
TypeScript
import { type LLMModelItemType } from '@fastgpt/global/core/ai/model.d';
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import type { CompletionFinishReason, CompletionUsage } from '@fastgpt/global/core/ai/type';
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import { getLLMDefaultUsage } from '@fastgpt/global/core/ai/constants';
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import { removeDatasetCiteText } from '@fastgpt/global/core/ai/llm/utils';
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/*
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Count response max token
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*/
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export const computedMaxToken = ({
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maxToken,
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model,
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min
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}: {
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maxToken?: number;
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model: LLMModelItemType;
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min?: number;
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}) => {
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if (maxToken === undefined) return;
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maxToken = Math.min(maxToken, model.maxResponse);
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return Math.max(maxToken, min || 0);
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};
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// FastGPT temperature range: [0,10], ai temperature:[0,2],{0,1]……
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export const computedTemperature = ({
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model,
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temperature
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}: {
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model: LLMModelItemType;
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temperature: number;
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}) => {
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if (typeof model.maxTemperature !== 'number') return undefined;
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temperature = +(model.maxTemperature * (temperature / 10)).toFixed(2);
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temperature = Math.max(temperature, 0.01);
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return temperature;
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};
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// LLM utils
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// Parse <think></think> tags to think and answer - unstream response
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export const parseReasoningContent = (text: string): [string, string] => {
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const regex = /<think>([\s\S]*?)<\/think>/;
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const match = text.match(regex);
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if (!match) {
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return ['', text];
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}
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const thinkContent = match[1].trim();
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// Add answer (remaining text after think tag)
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const answerContent = text.slice(match.index! + match[0].length);
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return [thinkContent, answerContent];
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};
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// Parse llm stream part
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export const parseLLMStreamResponse = () => {
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let isInThinkTag: boolean | undefined = undefined;
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let startTagBuffer = '';
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let endTagBuffer = '';
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const thinkStartChars = '<think>';
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const thinkEndChars = '</think>';
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let citeBuffer = '';
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const maxCiteBufferLength = 32; // [Object](CITE)总长度为32
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// Buffer
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let buffer_finishReason: CompletionFinishReason = null;
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let buffer_usage: CompletionUsage = getLLMDefaultUsage();
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let buffer_reasoningContent = '';
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let buffer_content = '';
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/*
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parseThinkTag - 只控制是否主动解析 <think></think>，如果接口已经解析了，则不再解析。
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retainDatasetCite -
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*/
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const parsePart = ({
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part,
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parseThinkTag = true,
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retainDatasetCite = true
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}: {
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part: {
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choices: {
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delta: {
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content?: string | null;
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reasoning_content?: string;
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};
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finish_reason?: CompletionFinishReason;
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}[];
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usage?: CompletionUsage;
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};
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parseThinkTag?: boolean;
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retainDatasetCite?: boolean;
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}): {
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reasoningContent: string;
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content: string; // 原始内容，不去掉 cite
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responseContent: string; // 响应的内容，会去掉 cite
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finishReason: CompletionFinishReason;
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} => {
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const data = (() => {
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buffer_usage = part.usage || buffer_usage;
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const finishReason = part.choices?.[0]?.finish_reason || null;
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buffer_finishReason = finishReason || buffer_finishReason;
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const content = part.choices?.[0]?.delta?.content || '';
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// @ts-ignore
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const reasoningContent = part.choices?.[0]?.delta?.reasoning_content || '';
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const isStreamEnd = !!buffer_finishReason;
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// Parse think
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const { reasoningContent: parsedThinkReasoningContent, content: parsedThinkContent } =
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(() => {
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if (reasoningContent || !parseThinkTag) {
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isInThinkTag = false;
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return { reasoningContent, content };
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}
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// 如果不在 think 标签中，或者有 reasoningContent(接口已解析），则返回 reasoningContent 和 content
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if (isInThinkTag === false) {
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return {
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reasoningContent: '',
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content
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};
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}
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// 检测是否为 think 标签开头的数据
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if (isInThinkTag === undefined) {
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// Parse content think and answer
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startTagBuffer += content;
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// 太少内容时候，暂时不解析
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if (startTagBuffer.length < thinkStartChars.length) {
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if (isStreamEnd) {
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const tmpContent = startTagBuffer;
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startTagBuffer = '';
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return {
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reasoningContent: '',
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content: tmpContent
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};
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}
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return {
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reasoningContent: '',
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content: ''
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};
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}
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if (startTagBuffer.startsWith(thinkStartChars)) {
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isInThinkTag = true;
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return {
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reasoningContent: startTagBuffer.slice(thinkStartChars.length),
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content: ''
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};
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}
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// 如果未命中 think 标签，则认为不在 think 标签中，返回 buffer 内容作为 content
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isInThinkTag = false;
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return {
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reasoningContent: '',
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content: startTagBuffer
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};
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}
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// 确认是 think 标签内容，开始返回 think 内容，并实时检测 </think>
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/*
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检测 </think> 方案。
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存储所有疑似 </think> 的内容，直到检测到完整的 </think> 标签或超出 </think> 长度。
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content 返回值包含以下几种情况:
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abc - 完全未命中尾标签
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abc<th - 命中一部分尾标签
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abc</think> - 完全命中尾标签
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abc</think>abc - 完全命中尾标签
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</think>abc - 完全命中尾标签
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k>abc - 命中一部分尾标签
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*/
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// endTagBuffer 专门用来记录疑似尾标签的内容
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if (endTagBuffer) {
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endTagBuffer += content;
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if (endTagBuffer.includes(thinkEndChars)) {
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isInThinkTag = false;
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const answer = endTagBuffer.slice(thinkEndChars.length);
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return {
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reasoningContent: '',
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content: answer
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};
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} else if (endTagBuffer.length >= thinkEndChars.length) {
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// 缓存内容超出尾标签长度，且仍未命中 </think>，则认为本次猜测 </think> 失败，仍处于 think 阶段。
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const tmp = endTagBuffer;
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endTagBuffer = '';
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return {
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reasoningContent: tmp,
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content: ''
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};
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}
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return {
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reasoningContent: '',
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content: ''
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};
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} else if (content.includes(thinkEndChars)) {
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// 返回内容，完整命中</think>，直接结束
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isInThinkTag = false;
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const [think, answer] = content.split(thinkEndChars);
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return {
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reasoningContent: think,
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content: answer
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};
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} else {
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// 无 buffer，且未命中 </think>，开始疑似 </think> 检测。
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for (let i = 1; i < thinkEndChars.length; i++) {
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const partialEndTag = thinkEndChars.slice(0, i);
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// 命中一部分尾标签
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if (content.endsWith(partialEndTag)) {
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const think = content.slice(0, -partialEndTag.length);
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endTagBuffer += partialEndTag;
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return {
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reasoningContent: think,
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content: ''
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};
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}
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}
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}
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// 完全未命中尾标签，还是 think 阶段。
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return {
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reasoningContent: content,
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content: ''
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};
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})();
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// Parse datset cite
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if (retainDatasetCite) {
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return {
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reasoningContent: parsedThinkReasoningContent,
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content: parsedThinkContent,
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responseContent: parsedThinkContent,
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finishReason: buffer_finishReason
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};
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}
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// 缓存包含 [ 的字符串，直到超出 maxCiteBufferLength 再一次性返回
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const parseCite = (text: string) => {
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// 结束时，返回所有剩余内容
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if (isStreamEnd) {
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const content = citeBuffer + text;
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citeBuffer = ''; // 清空缓冲区，避免重复输出
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return {
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content: removeDatasetCiteText(content, false)
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};
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}
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// 新内容包含 [，初始化缓冲数据
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if (text.includes('[') || text.includes('【')) {
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const index = text.indexOf('[') !== -1 ? text.indexOf('[') : text.indexOf('【');
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const beforeContent = citeBuffer + text.slice(0, index);
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citeBuffer = text.slice(index);
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// beforeContent 可能是：普通字符串，带 [ 的字符串
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return {
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content: removeDatasetCiteText(beforeContent, false)
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};
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}
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// 处于 Cite 缓冲区，判断是否满足条件
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else if (citeBuffer) {
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citeBuffer += text;
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// 检查缓冲区长度是否达到完整Quote长度或已经流结束
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if (citeBuffer.length >= maxCiteBufferLength) {
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const content = removeDatasetCiteText(citeBuffer, false);
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citeBuffer = '';
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return {
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content
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};
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} else {
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// 暂时不返回内容
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return { content: '' };
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}
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}
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return {
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content: text
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};
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};
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const { content: pasedCiteContent } = parseCite(parsedThinkContent);
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return {
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reasoningContent: parsedThinkReasoningContent,
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content: parsedThinkContent,
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responseContent: pasedCiteContent,
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finishReason: buffer_finishReason
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};
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})();
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buffer_reasoningContent += data.reasoningContent;
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buffer_content += data.content;
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return data;
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};
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const getResponseData = () => {
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return {
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finish_reason: buffer_finishReason,
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usage: buffer_usage,
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reasoningContent: buffer_reasoningContent,
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content: buffer_content
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};
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};
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const updateFinishReason = (finishReason: CompletionFinishReason) => {
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buffer_finishReason = finishReason;
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};
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return {
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parsePart,
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getResponseData,
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updateFinishReason
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};
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};
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