NIRVLab — Unigram Tokenizer for Vietnamese XNLI
A Unigram Language Model tokenizer trained from scratch on the Vietnamese (vi) subset
of the facebook/xnli dataset.
Training Details
| Parameter | Value |
|---|---|
| Algorithm | Unigram LM (SentencePiece-style) |
| Vocabulary size | 8,000 |
| Special tokens | <s>, <pad>, </s>, <unk>, <mask> |
| Corpus | facebook/xnli / vi — all splits |
| Corpus size | 800,404 sentences |
| Normalizer | Nmt + NFC Unicode |
| Pre-tokenizer | Metaspace (▁ prefix) |
| Shrinking factor | 0.75 |
| Max piece length | 16 |
Evaluation Metrics
| Metric | Value |
|---|---|
| Tokens / char | 0.2967 |
| Fertility (tokens / word) | 1.3142 |
| Avg sequence length | 24.81 tokens |
| Vocabulary coverage | 1.0000 |
Usage
from transformers import AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("NIRVLab/xnli-unigram-vi")
tokens = tokenizer("Xin chào thế giới!", return_tensors="pt")
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