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https://github.com/labring/FastGPT.git
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4.6.2-production (#518)
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@@ -3,126 +3,184 @@ import { countPromptTokens } from './tiktoken';
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/**
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* text split into chunks
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* maxLen - one chunk len. max: 3500
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* chunkLen - one chunk len. max: 3500
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* overlapLen - The size of the before and after Text
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* maxLen > overlapLen
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* chunkLen > overlapLen
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* markdown
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*/
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export const splitText2Chunks = (props: { text: string; maxLen: number; overlapLen?: number }) => {
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const { text = '', maxLen, overlapLen = Math.floor(maxLen * 0.2) } = props;
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const tempMarker = 'SPLIT_HERE_SPLIT_HERE';
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export const splitText2Chunks = (props: {
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text: string;
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chunkLen: number;
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overlapRatio?: number;
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}): {
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chunks: string[];
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tokens: number;
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} => {
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const { text = '', chunkLen, overlapRatio = 0.2 } = props;
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const splitMarker = 'SPLIT_HERE_SPLIT_HERE';
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const overlapLen = Math.round(chunkLen * overlapRatio);
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const stepReg: Record<number, RegExp> = {
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0: /^(#\s[^\n]+)\n/gm,
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1: /^(##\s[^\n]+)\n/gm,
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2: /^(###\s[^\n]+)\n/gm,
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3: /^(####\s[^\n]+)\n/gm,
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// The larger maxLen is, the next sentence is less likely to trigger splitting
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const stepReges: { reg: RegExp; maxLen: number }[] = [
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{ reg: /^(#\s[^\n]+)\n/gm, maxLen: chunkLen * 1.4 },
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{ reg: /^(##\s[^\n]+)\n/gm, maxLen: chunkLen * 1.4 },
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{ reg: /^(###\s[^\n]+)\n/gm, maxLen: chunkLen * 1.4 },
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{ reg: /^(####\s[^\n]+)\n/gm, maxLen: chunkLen * 1.4 },
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4: /(\n\n)/g,
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5: /([\n])/g,
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6: /([。]|(?!<[^a-zA-Z])\.\s)/g,
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7: /([！？]|!\s|\?\s)/g,
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8: /([；]|;\s)/g,
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9: /([，]|,\s)/g
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{ reg: /([\n]{2})/g, maxLen: chunkLen * 1.4 },
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{ reg: /([\n](?![\*\-|>`0-9]))/g, maxLen: chunkLen * 1.8 }, // (?![\*\-|>`0-9]): markdown special char
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{ reg: /([\n])/g, maxLen: chunkLen * 1.4 },
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{ reg: /([。]|([a-zA-Z])\.\s)/g, maxLen: chunkLen * 1.4 },
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{ reg: /([！]|!\s)/g, maxLen: chunkLen * 1.4 },
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{ reg: /([？]|\?\s)/g, maxLen: chunkLen * 1.6 },
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{ reg: /([；]|;\s)/g, maxLen: chunkLen * 1.8 },
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{ reg: /([，]|,\s)/g, maxLen: chunkLen * 2 }
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];
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const getSplitTexts = ({ text, step }: { text: string; step: number }) => {
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if (step >= stepReges.length) {
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return [text];
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}
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const isMarkdownSplit = step <= 3;
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const { reg } = stepReges[step];
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const splitTexts = text
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.replace(reg, isMarkdownSplit ? `${splitMarker}$1` : `$1${splitMarker}`)
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.split(`${splitMarker}`)
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.filter((part) => part.trim());
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return splitTexts;
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};
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const getOneTextOverlapText = ({ text, step }: { text: string; step: number }): string => {
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const forbidOverlap = step <= 6;
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const maxOverlapLen = chunkLen * 0.4;
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// step >= stepReges.length: Do not overlap incomplete sentences
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if (forbidOverlap || overlapLen === 0 || step >= stepReges.length) return '';
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const splitTexts = getSplitTexts({ text, step });
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let overlayText = '';
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for (let i = splitTexts.length - 1; i >= 0; i--) {
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const currentText = splitTexts[i];
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const newText = currentText + overlayText;
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const newTextLen = newText.length;
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if (newTextLen > overlapLen) {
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if (newTextLen > maxOverlapLen) {
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const text = getOneTextOverlapText({ text: newText, step: step + 1 });
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return text || overlayText;
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}
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return newText;
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}
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overlayText = newText;
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}
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return overlayText;
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};
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const splitTextRecursively = ({
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text = '',
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step,
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lastChunk,
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overlayChunk
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lastText
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}: {
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text: string;
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step: number;
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lastChunk: string;
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overlayChunk: string;
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}) => {
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if (text.length <= maxLen) {
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lastText: string;
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}): string[] => {
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// mini text
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if (text.length <= chunkLen) {
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return [text];
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}
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const reg = stepReg[step];
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const isMarkdownSplit = step < 4;
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if (!reg) {
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// use slice-maxLen to split text
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// oversize
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if (step >= stepReges.length) {
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if (text.length < chunkLen * 3) {
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return [text];
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}
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// use slice-chunkLen to split text
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const chunks: string[] = [];
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let chunk = '';
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for (let i = 0; i < text.length; i += maxLen - overlapLen) {
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chunk = text.slice(i, i + maxLen);
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chunks.push(chunk);
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for (let i = 0; i < text.length; i += chunkLen - overlapLen) {
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chunks.push(text.slice(i, i + chunkLen));
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}
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return chunks;
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}
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const { maxLen } = stepReges[step];
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const minChunkLen = chunkLen * 0.7;
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// split text by special char
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const splitTexts = (() => {
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if (!reg.test(text)) {
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return [text];
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}
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return text
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.replace(reg, isMarkdownSplit ? `${tempMarker}$1` : `$1${tempMarker}`)
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.split(`${tempMarker}`)
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.filter((part) => part);
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})();
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const splitTexts = getSplitTexts({ text, step });
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let chunks: string[] = [];
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const chunks: string[] = [];
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for (let i = 0; i < splitTexts.length; i++) {
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let text = splitTexts[i];
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let chunkToken = lastChunk.length;
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const textToken = text.length;
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const currentText = splitTexts[i];
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const currentTextLen = currentText.length;
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const lastTextLen = lastText.length;
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const newText = lastText + currentText;
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const newTextLen = lastTextLen + currentTextLen;
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// next chunk is too large / new chunk is too large(The current chunk must be smaller than maxLen)
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if (textToken >= maxLen || chunkToken + textToken > maxLen * 1.4) {
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// last chunk is too large, push it to chunks, not add to next chunk
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if (chunkToken > maxLen * 0.7) {
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chunks.push(lastChunk);
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lastChunk = '';
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overlayChunk = '';
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// newText is too large(now, The lastText must be smaller than chunkLen)
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if (newTextLen > maxLen) {
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// lastText greater minChunkLen, direct push it to chunks, not add to next chunk. (large lastText)
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if (lastTextLen > minChunkLen) {
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chunks.push(lastText);
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lastText = getOneTextOverlapText({ text: lastText, step }); // next chunk will start with overlayText
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i--;
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continue;
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}
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// chunk is small, insert to next chunks
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// split new Text, split chunks must will greater 1 (small lastText)
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const innerChunks = splitTextRecursively({
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text,
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text: newText,
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step: step + 1,
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lastChunk,
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overlayChunk
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lastText: ''
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});
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if (innerChunks.length === 0) continue;
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chunks = chunks.concat(innerChunks);
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lastChunk = '';
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overlayChunk = '';
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const lastChunk = innerChunks[innerChunks.length - 1];
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// last chunk is too small, concat it to lastText
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if (lastChunk.length < minChunkLen) {
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chunks.push(...innerChunks.slice(0, -1));
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lastText = lastChunk;
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} else {
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chunks.push(...innerChunks);
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// compute new overlapText
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lastText = getOneTextOverlapText({
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text: lastChunk,
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step
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});
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}
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continue;
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}
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// size less than maxLen, push text to last chunk
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lastChunk += text;
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chunkToken += textToken; // Definitely less than 1.4 * maxLen
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// size less than chunkLen, push text to last chunk. now, text definitely less than maxLen
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lastText = newText;
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// size over lapLen, push it to next chunk
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if (
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overlapLen !== 0 &&
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!isMarkdownSplit &&
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chunkToken >= maxLen - overlapLen &&
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textToken < overlapLen
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) {
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overlayChunk += text;
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}
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if (chunkToken >= maxLen) {
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chunks.push(lastChunk);
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lastChunk = overlayChunk;
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overlayChunk = '';
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// If the chunk size reaches, add a chunk
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if (newTextLen >= chunkLen) {
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chunks.push(lastText);
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lastText = getOneTextOverlapText({ text: lastText, step });
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}
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}
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/* If the last chunk is independent, it needs to be push chunks. */
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if (lastChunk && chunks[chunks.length - 1] && !chunks[chunks.length - 1].endsWith(lastChunk)) {
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chunks.push(lastChunk);
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if (lastText && chunks[chunks.length - 1] && !chunks[chunks.length - 1].endsWith(lastText)) {
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if (lastText.length < chunkLen * 0.4) {
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chunks[chunks.length - 1] = chunks[chunks.length - 1] + lastText;
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} else {
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chunks.push(lastText);
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}
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}
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return chunks;
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};
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try {
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const chunks = splitTextRecursively({ text, step: 0, lastChunk: '', overlayChunk: '' });
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const chunks = splitTextRecursively({
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text,
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step: 0,
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lastText: ''
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});
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const tokens = chunks.reduce((sum, chunk) => sum + countPromptTokens(chunk, 'system'), 0);
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@@ -102,13 +102,13 @@ export function responseWriteController({
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readStream: any;
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}) {
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res.on('drain', () => {
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readStream.resume();
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readStream?.resume?.();
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});
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return (text: string | Buffer) => {
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const writeResult = res.write(text);
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if (!writeResult) {
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readStream?.pause();
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readStream?.pause?.();
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}
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};
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}
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