gpt-tokenizer/esm/encodingParams/o200k_base.js

A pure JavaScript implementation of a BPE tokenizer (Encoder/Decoder) for GPT-2 / GPT-3 / GPT-4 and other OpenAI models

import { EndOfPrompt, EndOfText, FimMiddle, FimPrefix, FimSuffix, ImEnd, ImSep, ImStart, } from '../specialTokens.js';
import { CL_AND_O_TOKEN_SPLIT_PATTERN } from './constants.js';
export function O200KBase(bytePairRankDecoder) {
    const specialTokenMapping = new Map([
        [EndOfText, 199_999],
        [FimPrefix, 200_000],
        [FimMiddle, 200_001],
        [FimSuffix, 200_002],
        [ImStart, 200_003],
        [ImEnd, 200_004],
        [ImSep, 200_005],
        [EndOfPrompt, 200_006],
    ]);
    return {
        tokenSplitRegex: CL_AND_O_TOKEN_SPLIT_PATTERN,
        bytePairRankDecoder,
        specialTokensEncoder: specialTokenMapping,
    };
}
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