Class-Specific Knowledge-Guided Multimodal Prompt Tuning for Few-Shot Class-Incremental Learning
Fangying Xiong, Zhaoquan Yuan, Xiao Ying Wu, Changsheng Xu · IEEE Transactions on Circuits and Systems for Video Technology · 2025
Few-shot class-incremental learning (FSCIL) requires a model to learn the knowledge of new categories incrementally, using only a few samples, after being trained on a base session with ample categories and sample sizes. This task presents two major challenges: catastrophic forgetting and overfitting. Current approaches primarily enhance the model’s ability to extract knowledge during the base stage to improve adaptability to new tasks. Large-scale pre-trained models, known for their high robustness and zero-shot transfer capabilities, have demonstrated promising performance in FSCIL. The key to solving FSCIL lies in effectively fine-tuning such large models to balance the learning of new knowledge and the retention of old knowledge. Inspired by human-like knowledge retrieval mechanisms, we propose Class-specific Knowledge-Guided Prompt Tuning (CKGPT), which leverages class-specific prompts to guide the model in learning targeted knowledge reuse and integration effectively. When faced with novel tasks, the model selectively activates previously learned knowledge that is the most relevant, improving performance on new tasks while minimizing updates to irrelevant knowledge to reduce forgetting. By incorporating mechanisms that balance knowledge retention and transfer, CKGPT ensures a more robust adaptation to sequential tasks. Extensive experiments on multiple benchmarks validate the effectiveness of our method in achieving superior performance.