MoRAL: MoE Augmented LoRA for LLMs' Lifelong Learning
<|reference_start|>MoRAL: MoE Augmented LoRA for LLMs' Lifelong Learning: Adapting large language models (LLMs) to new domains/tasks and enabling them to be efficient lifelong learners is a pivotal challenge. In this paper, we propose MoRAL, i.e., Mixture-of-Experts augmented Low-Rank Adaptation for Lifelong Learning. MoRAL combines the multi-tasking abilities of MoE with the fine-tuning abilities of LoRA for effective life-long learning of LLMs. In contrast to the conventional approaches that use factual triplets as inputs MoRAL relies on simple question-answer pairs, which is a more practical and effective strategy for robust and efficient learning. Owing to new data settings, we introduce a new evaluation benchmark namely: Life Long Learning of LLM (5L-bench) encompassing a newly curated dataset of question-answer pairs, and a set of evaluation metrics for rigorous evaluation of MoRAL in open-book and closed-book settings. Experimental evaluation shows (i) LLMs learn fast in open-book settings with up to 30.15% improvement in "RA" for Phi-2-2.7B compared to closed-book (for models fine-tuned with MoRAL); (ii) MoRAL shows higher performance improvement for models with a greater number of parameters; (iii) MoRAL is robust to catastrophic forgetting offering better knowledge retention compared to baselines.<|reference_end|>
@article{yang2024moral:,
    title={MoRAL: MoE Augmented LoRA for LLMs' Lifelong Learning},
    author={Shu Yang, Muhammad Asif Ali, Cheng-Long Wang, Lijie Hu, and Di Wang},
    journal={arXiv preprint arXiv:2402.11260},
    year={2024},
    archivePrefix={arXiv},
    eprint={2402.11260},
    primaryClass={cs.CL cs.AI}
}