Language Model Adaptation for Low-Resource African Languages 🌍

This repository contains code used in the Language Model Adaptation for Low-Resource African Languages project.

[📄 Dissertation]

The corresponding trained and adapted tokenizers as well as models can be found on the HuggingFace site of the project.

Structure of the repository:

• evaluation/ - Code used for model evaluation on downstream tasks. In addition contains processed results.
• modelling/ - Functions for model embedding matrix modifications.
• scripts/ - Bash scripts for dataset processing, tokenizer and model training and model adaptation. Scripts come with SGE scheduler flags.
• tokenization/ - Functions for tokenizer adaptation.
• training/ - Functions for training dataset pre-processing and model training.
• fertility_analysis/ - Fertility evaluation results of selected tokenizers.
• add_tokens.py - Tokenizer adaptation through token addition.
• replace_tokens.py - Tokenizer adaptation through token replacement.
• add_embeddings.py- Model embedding matrix modification through embedding addition.
• replace_embeddings.py - Model embedding matrix modification through embedding replacement.
• fertility_evaluation.py - Script used for tokenizer fertility evaluation on WURA validation sets.
• train_model.py - Model training script.
• train_wura_tokenizer.py - Script used for training language-dedicated tokenizers using the WURA dataset.
• requirements.txt - A file containing a list of Python pip packages.
• README.md - This file :)

Results reproduction

Download data:

1. WURA dataset and place it in a ./data/wura directory.

To reproduce the tokenizer fertility results, run the following scripts:

1. Train language-dedicated tokenizers using scripts/train_wura_tokenizers_opt.qsub.sh.
2. Run add_tokens.py and replace_tokens.py to produce adapted tokenizers.
3. Specify paths to desired tokenizers and run fertility_evaluation.py.

To reproduce model adaptation results, run the above and the following:

1. Run add_embeddings.py and replace_embeddings.py to create models with modified embeddings.
2. Run all scripts from scripts/dataset_processing to pre-process, tokenize and group training samples.
3. Train models using scripts from scripts/model_training.
4. Run scripts/download_evaluation_data_repos.sh to download evaluation datasets.
5. Evaluate models
   1. Generate model answers by running scripts in scripts/model_evaluation.
   2. Aggregate and compute metrics using scripts from scripts/evaluation_results_processing.