xhLiu/PMRL_data

Principled Multimodal Representation Learning (PMRL)

A Novel Framework for Representation Learning Across Multiple Modalities

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✨ Overview

Principled Multimodal Representation Learning (PMRL) addresses the fundamental challenges in multimodal representation learning by proposing a novel framework that achieves simultaneous alignment of multiple modalities without anchor dependency.

💡 Our Solution

PMRL introduces a principled approach grounded in theoretical insights:

Key Insight: Full alignment corresponds to a rank-1 Gram matrix

Our framework optimizes the dominant singular value of the representation matrix to align modalities along a shared leading direction.

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🎯 Key Features

🔄 Simultaneous Multi-Modal Alignment

• No predefined anchor modality required
• Unified representation space for all modalities

🧮 Softmax-based Loss Function

• Treats singular values as logits
• Prioritizes the largest singular value for stable optimization

🎯 Instance-wise Contrastive Regularization

• Maintains inter-instance separability
• Prevents representation collapse

⚡ Distributed Training Support

• Multi-GPU training capabilities
• Efficient data parallel processing

📊 Comprehensive Evaluation

• Extensive benchmarking across diverse tasks
• Quantitative and qualitative analysis tools

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🏗️ Architecture

The PMRL framework consists of three main components:

1. 🔧 Multi-Modal Encoder: Processes different input modalities
2. 🎯 Singular Value Optimization: Aligns representations via dominant singular value
3. 🔄 Principled Regularization: Maintains instance-level discrimination

Citation

If you find this work useful, please consider citing:

@article{liu2026principled,
  title={Principled multimodal representation learning},
  author={Liu, Xiaohao and Xia, Xiaobo and Ng, See-Kiong and Chua, Tat-Seng},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence},
  year={2026},
  publisher={IEEE}
}

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