Cross-Task Affinity Learning for Multitask Dense Scene Predictions

Multitask learning (MTL) has become prominent for its ability to predict multiple tasks jointly achieving better per-task performance with fewer parameters than single-task learning. Recently decoder-focused architectures have significantly improved multitask performance by refining task predictions using features from related tasks. However most refinement methods struggle to efficiently capture both local and long-range dependencies between task-specific representations and cross-task patterns. In this paper we introduce the Cross-Task Affinity Learning (CTAL) module a lightweight framework that enhances task refinement in multitask networks. CTAL effectively captures local and long-range cross-task interactions by optimizing task affinity matrices for parameter-efficient grouped convolutions without concern for information loss. Our results demonstrate state-of-the-art MTL performance for both CNN and transformer backbones using significantly fewer parameters than single-task learning.