Optimizing LLM Adaptation for Low-Resource Contexts

Adapting large language models (LLMs) to low-resource languages—specifically Roman Urdu—presents a significant challenge due to data scarcity and the linguistic nuances of informal, code-mixed text. The core research objective is to identify the most efficient fine-tuning strategies that enable accurate hate speech detection without requiring the computational intensity of full-parameter fine-tuning.

Comparative Efficacy of Fine-Tuning Strategies

The study evaluates various parameter-efficient fine-tuning (PEFT) methods against traditional full-parameter approaches. By leveraging techniques like LoRA (Low-Rank Adaptation), the research demonstrates that it is possible to achieve competitive performance metrics in hate speech classification while updating only a small fraction of the model's total parameters. This approach is critical for practitioners working with limited hardware or datasets where overfitting is a high risk. The findings suggest that for low-resource languages, the choice of adapter rank and the selection of base model architecture are more impactful than simply increasing the volume of training data, which is often noisy or unavailable in these linguistic domains.

Addressing Linguistic Nuance in Roman Urdu

Roman Urdu presents unique obstacles, including non-standardized orthography, code-switching between Urdu and English, and the absence of formal grammatical structures. The research highlights that effective detection models must be robust to these variations. By comparing different model architectures, the authors provide a framework for selecting base models that possess sufficient cross-lingual transfer capabilities to handle Romanized scripts. The study concludes that targeted fine-tuning on domain-specific, annotated datasets significantly outperforms zero-shot or few-shot prompting approaches, which often struggle with the cultural and linguistic context inherent in hate speech detection tasks.