Multimodal Machine Learning Course Notes (11-777 / 18-777), Paul Pu Liang, Ruslan Salakhutdinov, et al., 2023 (Carnegie Mellon University) - Provides detailed course materials covering various multimodal learning topics and methods, including early fusion techniques.
Multimodal Deep Learning, Jiquan Ngiam, Aditya Khosla, Mingyu Kim, Juhan Nam, Honglak Lee, Andrew Y. Ng, 2011Proceedings of the 28th International Conference on Machine Learning (ICML) (Omnipress) - An early work showcasing the effectiveness of combining different modalities using deep learning, with discussion on early integration.