Multilingual Large Language Models (LLMs) have recently shown great capabilities in a wide range of tasks, exhibiting state-of-the-art performance through zero-shot or few-shot prompting methods. While there have been extensive studies on their abilities in monolingual tasks, the investigation of their potential in the context of code-switching (CSW), the practice of alternating languages within an utterance, remains relatively uncharted. In this paper, we provide a comprehensive empirical analysis of various multilingual LLMs, benchmarking their performance across four tasks: sentiment analysis, machine translation, summarization and word-level language identification. Our results indicate that despite multilingual LLMs exhibiting promising outcomes in certain tasks using zero or few-shot prompting, they still underperform in comparison to fine-tuned models of much smaller scales. We argue that current "multilingualism" in LLMs does not inherently imply proficiency with code-switching texts, calling for future research to bridge this discrepancy.
@article{arxiv.2305.14235,
title = {Multilingual Large Language Models Are Not (Yet) Code-Switchers},
author = {Ruochen Zhang and Samuel Cahyawijaya and Jan Christian Blaise Cruz and Genta Indra Winata and Alham Fikri Aji},
journal= {arXiv preprint arXiv:2305.14235},
year = {2023}
}