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VocabTxtLoader.LoadAsync

Reads a vocab.txt into a WordPiece vocabulary, asynchronously.

public static Task<WordPieceVocabulary> LoadAsync(Stream source, ArtifactLoadOptions options = null, string unkToken = "[UNK]", string continuationPrefix = "##", bool lowercase = false, CancellationToken cancellationToken = default)

Parameters — source is a readable stream, never disposed here; path is the file to read. options bounds what will be accepted and defaults to ArtifactLoadOptions's own defaults. unkToken is the piece an unknown word maps to, continuationPrefix marks a word-internal piece, and lowercase says whether the model was trained on lowercased text. cancellationToken cancels the read.

Returns — Task<WordPieceVocabulary>, completing with the loaded vocabulary.

Exceptions — ArgumentNullException for a null source or path. InvalidDataException when the content is not the format expected, declares a model this loader does not read, or exceeds a bound in options — the message names both the limit and the value. OperationCanceledException when cancellationToken is signalled.

Example — the same load, awaited.

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

static async Task<WordPieceVocabulary> LoadAsync() =>
    await VocabTxtLoader.LoadAsync(File.OpenRead("vocab.txt"), lowercase: true);

WordPieceVocabulary vocab = LoadAsync().GetAwaiter().GetResult();

Remarks — Same format, same parameters and same refusals as Load; only the I/O is asynchronous, and there is no string overload because opening the file is the synchronous part.

lowercase matters exactly as much here — see Load for why getting it wrong is silent.

Applies to — net10.0, netstandard2.0.

See also — VocabTxtLoader.Load, VocabTxtLoader, the persistence index.