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nanochat-german-tokenizer
stefan-it/nanochat-german-tokenizer
nanochat-german-tokenizer is a machine learning model from stefan-it. Use it for the machine learning task on the model card, and read the license before you ship it in a product. The card lists the license as apache-2.0.
This repository hosts a tokenizer, trained on the German nanochat dataset.
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At a glance
- License
- apache-2.0
- Model type
- nanochat
- Access
- Public
- Created
- Oct 19, 2025
- Updated
- Oct 24, 2025
- SHA
- 0049e292
Datasets
Model card
From the Hugging Face model README
nanochat German: Tokenizer
This repository hosts a tokenizer, trained on the German nanochat dataset.
Following the original nanochat tokenizer training process, we trained the tokenizer on 2B chars:
python -m scripts.tok_train --max_chars=2000000000
Stats
- max_chars: 2,000,000,000
- doc_cap: 10,000
- vocab_size: 65,536
- train_time: 117.8557
- num_special_tokens: 9
- token_bytes_min: 1
- token_bytes_max: 66
- token_bytes_mean: 7.5642
- token_bytes_std: 3.6434
Evaluation
Using:
python -m scripts.tok_eval
Comparison with GPT-2
| Text Type | Bytes | GPT-2 Tokens | GPT-2 Ratio | Ours Tokens | Ours Ratio | Relative Diff % |
|---|---|---|---|---|---|---|
| news | 1883 | 731 | 2.58 | 385 | 4.89 | +47.3% |
| korean | 893 | 745 | 1.20 | 802 | 1.11 | -7.7% |
| code | 1259 | 576 | 2.19 | 662 | 1.90 | -14.9% |
| math | 9172 | 4627 | 1.98 | 4062 | 2.26 | +12.2% |
| science | 1698 | 643 | 2.64 | 334 | 5.08 | +48.1% |
| fwe-train | 4555564 | 1694319 | 2.69 | 926779 | 4.92 | +45.3% |
| fwe-val | 4063797 | 1520703 | 2.67 | 841356 | 4.83 | +44.7% |
Comparison with GPT-4
| Text Type | Bytes | GPT-4 Tokens | GPT-4 Ratio | Ours Tokens | Ours Ratio | Relative Diff % |
|---|---|---|---|---|---|---|
| news | 1883 | 541 | 3.48 | 385 | 4.89 | +28.8% |
| korean | 893 | 364 | 2.45 | 802 | 1.11 | -120.3% |
| code | 1259 | 309 | 4.07 | 662 | 1.90 | -114.2% |
| math | 9172 | 3573 | 2.57 | 4062 | 2.26 | -13.7% |
| science | 1698 | 467 | 3.64 | 334 | 5.08 | +28.5% |
| fwe-train | 4555564 | 1296818 | 3.51 | 926779 | 4.92 | +28.5% |
| fwe-val | 4063797 | 1166775 | 3.48 | 841356 | 4.83 | +27.9% |
Notice: The original tokenizer evaluation scripts contain English examples. We did not simply "translate" these examples to German. Instead, we used proper German examples from newspaper articles, lecture notes, and theses. The modificed evaluation script can be found here.
- Type
- nanochat
- License
- apache-2.0
- Languages
- de
- Created
- Oct 19, 2025
- Updated
- Oct 24, 2025