Kokborok-MT

Neural machine translation model for Kokborok (Tripuri), a Tibeto-Burman language spoken primarily in Tripura, India. Fine-tuned from facebook/nllb-200-distilled-600M with a custom Kokborok language token (trp_Latn).

Model Details

• Base Model: facebook/nllb-200-distilled-600M
• Language Pair: English ↔ Kokborok (Roman script)
• Developed by: MWire Labs
• License: CC-BY-4.0

Performance

System	Direction	BLEU	chrF	ROUGE-L	METEOR	TER	Cos Sim	COMET
Zero-Shot NLLB	EN→TRP	0.50	11.89	0.0261	0.0132	139.51	0.1939	0.2697
Zero-Shot NLLB	TRP→EN	0.63	17.07	0.0675	0.0526	130.30	0.1872	0.2880
MWirelabs/kokborok-mt	EN→TRP	17.30	47.67	0.4332	0.3483	74.26	0.7596	0.7064
MWirelabs/kokborok-mt	TRP→EN	38.56	53.92	0.5919	0.5602	50.15	0.8171	0.6926

Fine-tuning provides 30x improvement over zero-shot NLLB baseline. Full evaluation details and ablation studies in the accompanying paper (forthcoming).

Usage

from transformers import AutoModelForSeq2SeqLM, AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("MWirelabs/kokborok-mt")
model = AutoModelForSeq2SeqLM.from_pretrained("MWirelabs/kokborok-mt")

# English → Kokborok
tokenizer.src_lang = "eng_Latn"
tokenizer.tgt_lang = "trp_Latn"
inputs = tokenizer("Hello, how are you?", return_tensors="pt")
outputs = model.generate(**inputs, forced_bos_token_id=tokenizer.convert_tokens_to_ids("trp_Latn"))
print(tokenizer.decode(outputs[0], skip_special_tokens=True))

# Kokborok → English
tokenizer.src_lang = "trp_Latn"
tokenizer.tgt_lang = "eng_Latn"
inputs = tokenizer("Chwng khwbai tamo?", return_tensors="pt")
outputs = model.generate(**inputs, forced_bos_token_id=tokenizer.convert_tokens_to_ids("eng_Latn"))
print(tokenizer.decode(outputs[0], skip_special_tokens=True))

Citation

@misc{mwirelabs_kokborok_mt_2026,
  title={Kokborok-MT: Neural Machine Translation for Kokborok (Tripuri)},
  author={MWire Labs},
  year={2026},
  howpublished={\url{https://huggingface.co/MWirelabs/kokborok-mt}},
}

About MWire Labs

MWire Labs builds foundational language technology for Northeast Indian indigenous languages.