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TokenizerJsonLoader

Reads a HuggingFace tokenizer.json: the WordPiece, Unigram or BPE model it declares, with the settings that change tokenization.

public static class TokenizerJsonLoader

Example — one file, three models, and you pick which one you expect.

using Lodestar.Embeddings.Persistence;
using Lodestar.Embeddings.Tokenization;

WordPieceVocabulary wordPiece = TokenizerJsonLoader.LoadWordPiece("tokenizer.json");
SentencePieceVocabulary unigram = TokenizerJsonLoader.LoadUnigram("tokenizer.json");
BpeVocabulary bpe = TokenizerJsonLoader.LoadBpe("tokenizer.json");

Remarks — tokenizer.json is the modern format and carries the whole pipeline, not just the vocabulary. That is why there are three entry points rather than one returning a common type: you say which model you expect, and a file declaring another is refused rather than coerced.

This is the vocabulary side of tokenizers.Tokenizer.from_file. Each tokenizer in this package implements one fixed pipeline, so a file describing a different one is refused by name — the guide's "Models that are refused" lists them. Stock BERT is among them, and its route is VocabTxtLoader.

An unknown top-level property is accepted in silence, which is deliberate: the format grows, and refusing a file for carrying a key this loader has never heard of would break on every new version of tokenizers. Properties that change tokenization are read; the rest are not this loader's business.

Applies to — net10.0, netstandard2.0.

See also — VocabTxtLoader, BpeFilesLoader, the persistence index, the embeddings guide.

Members

Member	What it does
TokenizerJsonLoader.LoadBpe	The BPE model a tokenizer.json declares.
TokenizerJsonLoader.LoadBpeAsync	The same, asynchronously.
TokenizerJsonLoader.LoadUnigram	The Unigram model a tokenizer.json declares.
TokenizerJsonLoader.LoadUnigramAsync	The same, asynchronously.
TokenizerJsonLoader.LoadWordPiece	The WordPiece model a tokenizer.json declares.
TokenizerJsonLoader.LoadWordPieceAsync	The same, asynchronously.