A multimodal machine learning approach

Modality refers to the way in which something is experienced.

For example, you are trying to build a product recommendation for an e-commerce website. There are various sources of information available about the user. Having a single model would mean all such information should be passed as feature, and then a prediction would be made. On the other hand, a multi-modal approach would have various models for different sources and combine the result. This enables a prediction even with sparser data.