Recent progress in Sign Language Translation has focussed primarily on improving the representational capacity of large language models to incorporate sign-language features. This work explores an alternative direction: enhancing the geometric properties of skeletal representations themselves. We propose Geo-Sign, a method that leverages the properties of hyperbolic geometry to model the hierarchical structure inherent in sign language kinematics. By projecting skeletal features derived from Spatio-Temporal Graph Convolutional Networks (ST-GCNs) into the Poincaré ball model, we aim to create more discriminative embeddings, particularly for fine-grained motions like finger articulations. We introduce a hyperbolic projection layer, a weighted Fréchet mean aggregation scheme, and a geometric contrastive loss operating directly in hyperbolic space. These components are integrated into an end-to-end translation framework as a regularisation function, to enhance the representations within the language model. This work demonstrates the potential of hyperbolic geometry to improve skeletal representations for Sign Language Translation, improving on SOTA RGB methods while preserving privacy and improving computational efficiency.

Movie genre classification is an active research area in machine learning; however, the content of movies can vary widely within a single genre label. We expand these ‘coarse’ genre labels by identifying ‘fine-grained’ contextual relationships within the multi-modal content of videos. By leveraging pre-trained ‘expert’ networks, we learn the influence of different combinations of modes for multi-label genre classification. Then, we continue to fine-tune this ‘coarse’ genre classification network self-supervised to sub-divide the genres based on the multi-modal content of the videos. Our approach is demonstrated on a new multi-moda137,866,450 frame, 8,800 movie trailer dataset, MMX-Trailer-20, which includes pre-computed audio, location, motion, and image embeddings.