PRILoRA: Pruned and Rank-Increasing Low-Rank Adaptation
This addresses parameter-efficient fine-tuning for NLP practitioners, offering incremental improvements over existing methods like LoRA.
The paper tackled the inefficiency of fine-tuning large pre-trained language models by introducing PRILoRA, a method that allocates different ranks per layer and prunes weights during training, achieving new state-of-the-art results on eight GLUE benchmarks.
With the proliferation of large pre-trained language models (PLMs), fine-tuning all model parameters becomes increasingly inefficient, particularly when dealing with numerous downstream tasks that entail substantial training and storage costs. Several approaches aimed at achieving parameter-efficient fine-tuning (PEFT) have been proposed. Among them, Low-Rank Adaptation (LoRA) stands out as an archetypal method, incorporating trainable rank decomposition matrices into each target module. Nevertheless, LoRA does not consider the varying importance of each layer. To address these challenges, we introduce PRILoRA, which linearly allocates a different rank for each layer, in an increasing manner, and performs pruning throughout the training process, considering both the temporary magnitude of weights and the accumulated statistics of the input to any given layer. We validate the effectiveness of PRILoRA through extensive experiments on eight GLUE benchmarks, setting a new state of the art.