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Lanor-and-Nick/
twi-english-nllb-lora

Name: twi-english-nllb-lora
Availability: InStock

facebook/nllb-200-distilled-600M

adapter

apache-2.0

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Twi to English NLLB LoRA Adapter

This repository contains a LoRA adapter fine-tuned for Twi to English translation. It was trained from facebook/nllb-200-distilled-600M using the local Ghana NLP Twi-English parallel text dataset included in the Sukuupath project.

Model Details

Task: Twi to English translation
Base model: facebook/nllb-200-distilled-600M
Adapter type: LoRA / PEFT
Source language tag: twi_Latn
Target language tag: eng_Latn
Training hardware: NVIDIA RTX 2060, 6 GB VRAM
Trainable parameters: 2,359,296 of 617,433,088 total parameters

Training Data

The adapter was fine-tuned on:

TWI_ENGLISH_PARALLEL_TEXT
3,888 training examples
431 validation examples

The original CSV used text as the Twi source column and label as the English target/reference column.

Evaluation

Best validation checkpoint: checkpoint-900

Metric	Value	Interpretation
BLEU	27.18	Decent/useful translation quality for a low-resource language pair.
chrF	48.36	Good character-level similarity; useful for spelling/morphology variation.
Eval loss	1.5420	Lower is better; improved from 1.9584 at step 100.

Translation does not use ordinary classification accuracy because many different English translations can be valid for the same Twi sentence.

Usage

python

from peft import PeftConfig, PeftModel
from transformers import AutoModelForSeq2SeqLM, AutoTokenizer
import torch

model_id = "Lanor-and-Nick/twi-english-nllb-lora"
source_lang = "twi_Latn"
target_lang = "eng_Latn"

def normalize_twi_keyboard_text(text: str) -> str:
    return text.replace("C", "Ɔ").replace("c", "ɔ").replace("3", "ɛ")

config = PeftConfig.from_pretrained(model_id)
tokenizer = AutoTokenizer.from_pretrained(model_id, src_lang=source_lang, tgt_lang=target_lang)
base_model = AutoModelForSeq2SeqLM.from_pretrained(config.base_model_name_or_path)
model = PeftModel.from_pretrained(base_model, model_id)

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model.to(device)
model.eval()

text = normalize_twi_keyboard_text("3he na wowc? M'ani gye w'as3m ho")
inputs = tokenizer(text, return_tensors="pt").to(device)
forced_bos_token_id = tokenizer.convert_tokens_to_ids(target_lang)

with torch.no_grad():
    output = model.generate(
        **inputs,
        forced_bos_token_id=forced_bos_token_id,
        max_new_tokens=192,
        num_beams=5,
        no_repeat_ngram_size=3,
    )

print(tokenizer.batch_decode(output, skip_special_tokens=True)[0])

Sample Outputs

Twi input	Model output
`me dc wo`	`i love you`
`3he na wowc?`	`where are you?`
`3he na wowc? M'ani gye w'as3m ho`	`where are you? I love your story`
`Yei nti, ama nnipa pii ani agye ho pa ara.`	`For this reason, it has made it very popular among many people.`

Limitations

This is a useful fine-tuned model, not a perfect translator. It may struggle with slang, idioms, informal Twi, spelling variation, names, or sentences far outside the training distribution. Human review is recommended for high-stakes use.