Predicting Event Memorability using Personalized Federated Learning

Lifelog images are very useful as memory cues for recalling past events. Estimating the level of event memory recall induced by a given lifelog image (event memorability) is useful for selecting images for cognitive interventions. Previous works for predicting event memorability follow a centralized model training paradigm that requires several users to share their lifelog images. This risks violating the privacy of individual lifeloggers. Alternatively a personal model trained with a lifelogger's own data guarantees privacy. However it imposes significant effort on the lifelogger to provide a large enough sample of self-rated images to develop a well-performing model for event memorability. Therefore we propose a clustered personalized federated learning setup FedMEM that avoids sharing raw images but still enables collaborative learning via model sharing. For an enhanced learning performance in the presence of data heterogeneity FedMEM evaluates similarity among users to group them into clusters. We demonstrate that our approach furnishes high-performing personalized models compared to the state-of-the-art.