Neuro-Inspired Information-Theoretic Hierarchical Perception for Multimodal Learning
This addresses the problem of integrating diverse information sources for more accurate perception in autonomous and cyber-physical systems, representing a strong specific gain rather than an incremental improvement.
The paper tackles multimodal learning by proposing the Information-Theoretic Hierarchical Perception (ITHP) model, which uses an information bottleneck to designate a prime modality and treat others as detectors, resulting in compact latent representations that outperform state-of-the-art benchmarks, including surpassing human-level performance on the CMU-MOSI dataset in multimodal sentiment binary classification.
Integrating and processing information from various sources or modalities are critical for obtaining a comprehensive and accurate perception of the real world in autonomous systems and cyber-physical systems. Drawing inspiration from neuroscience, we develop the Information-Theoretic Hierarchical Perception (ITHP) model, which utilizes the concept of information bottleneck. Different from most traditional fusion models that incorporate all modalities identically in neural networks, our model designates a prime modality and regards the remaining modalities as detectors in the information pathway, serving to distill the flow of information. Our proposed perception model focuses on constructing an effective and compact information flow by achieving a balance between the minimization of mutual information between the latent state and the input modal state, and the maximization of mutual information between the latent states and the remaining modal states. This approach leads to compact latent state representations that retain relevant information while minimizing redundancy, thereby substantially enhancing the performance of multimodal representation learning. Experimental evaluations on the MUStARD, CMU-MOSI, and CMU-MOSEI datasets demonstrate that our model consistently distills crucial information in multimodal learning scenarios, outperforming state-of-the-art benchmarks. Remarkably, on the CMU-MOSI dataset, ITHP surpasses human-level performance in the multimodal sentiment binary classification task across all evaluation metrics (i.e., Binary Accuracy, F1 Score, Mean Absolute Error, and Pearson Correlation).