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Ids only, without building the token strings.

public IReadOnlyList<int> EncodeToIds(string text)

Parameters — text is the string to encode.

Returns — IReadOnlyList<int>, the same ids Encode would give.

Example — the same ids, one allocation fewer.

using Lodestar.Embeddings.Tokenization;

var vocab = new Dictionary<string, int>(StringComparer.Ordinal)
{
    ["[UNK]"] = 0, ["token"] = 1, ["##ize"] = 2, ["text"] = 3,
};
var tokenizer = new WordPieceTokenizer(
    vocab, unkToken: "[UNK]", continuationPrefix: "##", maxCharsPerWord: 100, lowercase: true);

IReadOnlyList<int> ids = tokenizer.EncodeToIds("tokenize text");

int count = ids.Count;  // => 3
int first = ids[0];  // => 1

Remarks — the token strings are what make a tokenization readable, and building them costs a list of strings per call. When the ids go straight to a model and nobody will look at them, this skips that — which is the hot path for encoding a corpus.

Reach for Encode while developing and this once it works. The ids are identical; only the debuggability differs.

Applies to — net10.0, netstandard2.0.

See also — WordPieceTokenizer.Encode.