Dual-Stream Cross-Modal Representation Learning via Residual Semantic Decorrelation

TL;DR

This paper introduces DSRSD-Net, a dual-stream framework that disentangles and decorrelates shared and private modality features to improve cross-modal learning, robustness, and interpretability.

Contribution

The paper proposes a novel dual-stream residual semantic decorrelation network that explicitly separates and aligns shared and private features across modalities, addressing redundancy and dominance issues.

Findings

Improves prediction accuracy on educational benchmarks.

Effectively disentangles modality-specific and shared information.

Reduces cross-modal redundancy and enhances robustness.

Abstract

Cross-modal learning has become a fundamental paradigm for integrating heterogeneous information sources such as images, text, and structured attributes. However, multimodal representations often suffer from modality dominance, redundant information coupling, and spurious cross-modal correlations, leading to suboptimal generalization and limited interpretability. In particular, high-variance modalities tend to overshadow weaker but semantically important signals, while na\"ive fusion strategies entangle modality-shared and modality-specific factors in an uncontrolled manner. This makes it difficult to understand which modality actually drives a prediction and to maintain robustness when some modalities are noisy or missing. To address these challenges, we propose a Dual-Stream Residual Semantic Decorrelation Network (DSRSD-Net), a simple yet effective framework that disentangles modality-specific and modality-shared information through residual decomposition and explicit semantic decorrelation constraints. DSRSD-Net introduces: (1) a dual-stream representation learning module that separates intra-modal (private) and inter-modal (shared) latent factors via residual projection; (2) a residual semantic alignment head that maps shared factors from different modalities into a common space using a combination of contrastive and regression-style objectives; and (3) a decorrelation and orthogonality loss that regularizes the covariance structure of the shared space while enforcing orthogonality between shared and private streams, thereby suppressing cross-modal redundancy and preventing feature collapse. Experimental results on two large-scale educational benchmarks demonstrate that DSRSD-Net consistently improves next-step prediction and final outcome prediction over strong single-modality, early-fusion, late-fusion, and co-attention baselines.