mT5-large Dhivehi→English (sentence-level)
mT5-large (1.2B, encoder-decoder) for Dhivehi→English translation, trained on a sentence-level Dhivehi–English corpus (machine-translated).
Sentence-level variant. For multi-sentence input, see the paragraph models: Qwen-para / mT5-para. Suited for single-sentence input.
Scores (chrF / chrF++ / BLEU)
| Benchmark | chrF | chrF++ | BLEU |
|---|---|---|---|
| gold (human references, article-level, N=500) | 53.67 | 50.01 | 13.91 |
| held-out chunk (in-distribution) | 66.33 | 64.53 | 40.76 |
| held-out sentence (in-distribution) | 63.94 | 62.15 | 39.45 |
chrF is the metric to trust for Thaana; BLEU is unreliable (word segmentation / morphology).
Example
Input (dv): އެއީ، މިދިޔަ އަހަރުގެ މި މުއްދަތާ ބަލާއިރު، 7.6 އިންސައްތައިގެ ކުރިއެރުމެއް ކަމަށްވާއިރު، ދުވާލަކަށް 7،778 ފަތުރުވެރިން ރާއްޖެ ޒިޔާރަތްކުރެއެވެ.
Output (en): That is, while there is an increase of 7.6 percent compared to the same period last year, 7,778 tourists visit the Maldives per day.
Real held-out sample and this model's own output.
Usage
import torch
from transformers import AutoModelForSeq2SeqLM, AutoTokenizer
m = "Neobe/dhivehi-en-mt5-large-sentence"
tok = AutoTokenizer.from_pretrained(m)
model = AutoModelForSeq2SeqLM.from_pretrained(m, torch_dtype=torch.float32).eval().cuda() # fp32
src = "ދިވެހިރާއްޖޭގެ ރައީސް މިއަދު ކެބިނެޓާ ބައްދަލުކުރެއްވި އެވެ."
inp = tok(src, return_tensors="pt", truncation=True, max_length=1024).to("cuda")
out = model.generate(**inp, max_new_tokens=256, num_beams=4)
print(tok.decode(out[0], skip_special_tokens=True))
Run in fp32 — the T5 family produces garbage in bf16/fp16. ~5–6 GB VRAM.
Training
Base google/mt5-large; fp32; Adafactor; LR 1e-4 cosine; max_length 512; 1 epoch; effective batch ~32; gradient checkpointing.
Limitations
Domain = Maldivian news / press / Wikipedia; technical or informal English is out of distribution. Non-human references are machine-generated (distillation).
Citation
@misc{neobe_dhivehi_en_mt5_large_sentence_2026,
title = {mT5-large Dhivehi→English (sentence-level)},
author = {Neobe},
year = {2026},
howpublished = {\url{https://huggingface.co/Neobe/dhivehi-en-mt5-large-sentence}}
}