Representation Stability of Video-JEPA with Mixed-Dataset Pretraining Under Temporal Perturbations

Abstract

Abstract: Joint-Embedding Predictive Architectures (JEPA) are a promising framework for self-supervised video representation learning, yet the behavior of auxiliary objectives in small-scale Video-JEPA training is not well characterized. We report a small-scale empirical study of 18 auxiliary objective variants for Video-JEPA across two pretraining regimes: single-dataset (UCF-101) and mixed-dataset (UCF-101 + Something-Something V2 + ImageNet-100). We evaluate frozen representations on three complementary benchmarks: Diving-48 (fine-grained motion), SomethingSomething V2 (temporal reasoning), and Image

Research Question

What is the impact of mixed-dataset pretraining on the representation stability of Video-JEPA under temporal perturbations relative to single-dataset training?

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