Multimodal Learning: Transformers and Boltzmann Machines

Multimodal learning overview and motivation

Multimodal learning is a deep learning approach that integrates multiple data modalities—such as text, audio, images, and video—so a model can capture complementary information that appears across different forms of input. The motivation is that real-world data is often inherently multimodal, and each modality can express different aspects of the same underlying concept. For example, captions can convey information not directly visible in an image, and visual patterns can help disambiguate meaning suggested by text. Jointly representing and fusing these modalities can therefore improve performance on tasks that require understanding across media. The topic also highlights how multimodal models are commonly built using transformer-based methods. A frequent strategy is to adapt modalities into a token-like representation (e.g., turning image features into “image tokens” that can be interleaved with text tokens) and then fine-tune on paired multimodal datasets. Integration can be done via early fusion (fusing embeddings early) or intermediate fusion (processing each modality separately before fusing), often using cross-attention to connect information from different modalities. Multimodal learning has been proposed since the early deep-learning era and has grown rapidly with large multimodal models, enabling applications such as visual question answering, cross-modal retrieval, text-to-image generation, and image captioning.

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Modalities and joint representation learning

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