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README.md

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+---
+library_name: tokenizers
+tags:
+  - tokenizer
+  - multilingual
+  - byte-level-bpe
+  - indigenous-languages
+  - tachiwin
+---
+
+# Tachiwin multilingual tokenizer
+
+A multilingual ByteLevel-BPE tokenizer trained with Hugging Face Tokenizers.
+
+## Corpus weighting
+
+| Component | Target |
+|---|---:|
+| Modern + old exotic-language data | 70% |
+| English | 10% |
+| Spanish | 10% |
+| Code | 10% |
+
+The complete available exotic-language corpus is used as the 70% anchor.
+Its existing modern/old composition is preserved.
+
+## Tokenizer
+
+- Model: BPE, trained via `Tokenizer.train_from_iterator` over a streaming
+  line generator (constant memory regardless of corpus size)
+- Vocabulary target: 256,000
+- Initial alphabet: complete ByteLevel alphabet
+- ByteLevel GPT-2 regex: disabled
+- Unicode normalizer: none
+- Special tokens: 274
+- Human-language tags: 240
+
+## Corpus size
+
+Total materialized corpus: 360,820,186 bytes (0.336 GiB)
+
+## Evaluation
+
+The tokenizer was evaluated against the Tachiwin language catalogue.
+Languages without text samples are skipped. For each language, all
+available samples are concatenated ONLY within that language for aggregate
+fertility statistics. Metrics: characters/token, tokens/character, UTF-8
+bytes/token, tokens/UTF-8 byte, exact round-trip preservation.
+
+## Important training note
+
+The Hugging Face BPE trainer does not expose an internal resumable
+merge-state checkpoint. The recipe therefore treats the completed
+`tokenizer.json` as the training checkpoint:
+
+- corpus preparation is resumable (both the exotic streaming pass and the
+  capped external-corpus downloads reuse existing shards);
+- recipe/statistics/checksums are stored in `recipe/`;
+- if `tokenizer.json` already exists, subsequent runs skip BPE training;
+- an interrupted BPE computation itself must be restarted.
+
+## Repository evaluation artifacts
+
+- evaluation/catalogue.json
+- evaluation/language_fertility.csv
+- evaluation/language_fertility.json
+- evaluation/evaluation_summary.json