---
license: mit
language:
- arb
- ces
- cmn
- dan
- deu
- ell
- fra
- fw_
- hun
- ind
- ita
- jpn
- nld
- pol
- por
- rus
- spa
- swe
- tur
- vie

tags:
- tokenizer
- bpe
- flexitok
- fineweb2
---

# Byte-Level BPE Tokenizer: ['arb_Arab', 'ces_Latn', 'cmn_Hani', 'dan_Latn', 'deu_Latn', 'ell_Grek', 'fra_Latn', 'fw_edu', 'hun_Latn', 'ind_Latn', 'ita_Latn', 'jpn_Jpan', 'nld_Latn', 'pol_Latn', 'por_Latn', 'rus_Cyrl', 'spa_Latn', 'swe_Latn', 'tur_Latn', 'vie_Latn'] (128K)

A **Byte-Level BPE** tokenizer trained on **['arb_Arab', 'ces_Latn', 'cmn_Hani', 'dan_Latn', 'deu_Latn', 'ell_Grek', 'fra_Latn', 'fw_edu', 'hun_Latn', 'ind_Latn', 'ita_Latn', 'jpn_Jpan', 'nld_Latn', 'pol_Latn', 'por_Latn', 'rus_Cyrl', 'spa_Latn', 'swe_Latn', 'tur_Latn', 'vie_Latn']** data from Fineweb-2-HQ.

## Training Details

| Parameter | Value |
|-----------|-------|
| Algorithm | Byte-Level BPE |
| Language | `['arb_Arab', 'ces_Latn', 'cmn_Hani', 'dan_Latn', 'deu_Latn', 'ell_Grek', 'fra_Latn', 'fw_edu', 'hun_Latn', 'ind_Latn', 'ita_Latn', 'jpn_Jpan', 'nld_Latn', 'pol_Latn', 'por_Latn', 'rus_Cyrl', 'spa_Latn', 'swe_Latn', 'tur_Latn', 'vie_Latn']` |
| Target Vocab Size | 128,000 |
| Final Vocab Size | 128,353 |
| Pre-tokenizer | custom:SCRIPT_AWARE_CHAR_PATTERN |
| Number handling | ltr_3digit |
| Contraction handling | True |
| Normalizer | NFC |
| Special Tokens | `<s>`, `</s>`, `<pad>`, `<unk>` |
| Training Shards | 40, ['fineweb_2_hq.arb_Arab.chunk.00.jsonl', 'fineweb_2_hq.arb_Arab.chunk.01.jsonl', 'fineweb_2_hq.ces_Latn.chunk.00.jsonl', 'fineweb_2_hq.ces_Latn.chunk.01.jsonl', 'fineweb_2_hq.cmn_Hani.chunk.00.jsonl', 'fineweb_2_hq.cmn_Hani.chunk.01.jsonl', 'fineweb_2_hq.dan_Latn.chunk.00.jsonl', 'fineweb_2_hq.dan_Latn.chunk.01.jsonl', 'fineweb_2_hq.deu_Latn.chunk.00.jsonl', 'fineweb_2_hq.deu_Latn.chunk.01.jsonl', 'fineweb_2_hq.ell_Grek.chunk.00.jsonl', 'fineweb_2_hq.ell_Grek.chunk.01.jsonl', 'fineweb_2_hq.fra_Latn.chunk.00.jsonl', 'fineweb_2_hq.fra_Latn.chunk.01.jsonl', 'fineweb_edu_100bt.chunk.00.jsonl', 'fineweb_edu_100bt.chunk.01.jsonl', 'fineweb_2_hq.hun_Latn.chunk.00.jsonl', 'fineweb_2_hq.hun_Latn.chunk.01.jsonl', 'fineweb_2_hq.ind_Latn.chunk.00.jsonl', 'fineweb_2_hq.ind_Latn.chunk.01.jsonl', 'fineweb_2_hq.ita_Latn.chunk.00.jsonl', 'fineweb_2_hq.ita_Latn.chunk.01.jsonl', 'fineweb_2_hq.jpn_Jpan.chunk.00.jsonl', 'fineweb_2_hq.jpn_Jpan.chunk.01.jsonl', 'fineweb_2_hq.nld_Latn.chunk.00.jsonl', 'fineweb_2_hq.nld_Latn.chunk.01.jsonl', 'fineweb_2_hq.pol_Latn.chunk.00.jsonl', 'fineweb_2_hq.pol_Latn.chunk.01.jsonl', 'fineweb_2_hq.por_Latn.chunk.00.jsonl', 'fineweb_2_hq.por_Latn.chunk.01.jsonl', 'fineweb_2_hq.rus_Cyrl.chunk.00.jsonl', 'fineweb_2_hq.rus_Cyrl.chunk.01.jsonl', 'fineweb_2_hq.spa_Latn.chunk.00.jsonl', 'fineweb_2_hq.spa_Latn.chunk.01.jsonl', 'fineweb_2_hq.swe_Latn.chunk.00.jsonl', 'fineweb_2_hq.swe_Latn.chunk.01.jsonl', 'fineweb_2_hq.tur_Latn.chunk.00.jsonl', 'fineweb_2_hq.tur_Latn.chunk.01.jsonl', 'fineweb_2_hq.vie_Latn.chunk.00.jsonl', 'fineweb_2_hq.vie_Latn.chunk.01.jsonl'] |

## Usage

```python
from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("flexitok/bpe_script_aware_charr_AllL_128000")
tokens = tokenizer.encode("Hello, world!")
```

## Files

- `tokenizer.json` — Full HuggingFace tokenizer
- `vocab.json` — Vocabulary mapping
- `merges.txt` — BPE merge rules

## Sample Encoding
| Text | Tokens | Token IDs |
|------|--------|-----------|
| `Hello, world! 12345 This is a test. こんにちは` | `Hello, ,, Ġworld, !, Ġ, 123, 45, ĠThis, Ġis, Ġa, Ġtest, ., Ġãģĵ, ãĤĵ, ãģ«, ãģ¡, ãģ¯` | `105324, 14, 6289, 3, 223, 22942, 4306, 4128, 580, 266, 2392, 16, 17920, 1728, 616, 2729, 701` |

Command used to create this tokenizer:
```bash
['/home/gsa/tokenizers2/flexitok/tokenizer_training/train_tokenizers.py', 'algorithm=bpe', 'vocab_size=128000', 'langs=[arb_Arab,ces_Latn,cmn_Hani,dan_Latn,deu_Latn,ell_Grek,fra_Latn,fw_edu,hun_Latn,ind_Latn,ita_Latn,jpn_Jpan,nld_Latn,pol_Latn,por_Latn,rus_Cyrl,spa_Latn,swe_Latn,tur_Latn,vie_Latn]', 'data_dir=/scratch/gsa/data/flexitok/', 'output_dir=/scratch/gsa/trained_tokenizers', 'pretokenizer=custom:SCRIPT_AWARE_CHAR_PATTERN', 'number_handling=ltr_3digit', 'add_numbers=true', 'handle_contractions=true', 'unicode_normalization=nfc', 'use_byte_level_regex=false', 'byte_fallback=false', 'strip_zero_width=false', 'cjk_char_split=false', 'cjk_char_coverage=0.999', 'add_cjk_chars=true', 'max_lines=500_000', 'hf.publish_to_hf=true', 'hf_repo_prefix=flexitok/', 'hf.hf_repo_id=flexitok/bpe_script_aware_charr_AllL_128000', 'hf.collections=[flexitok/script-based-tokenizers]']