Machine Heart

Sep 27, 2026 · Artificial Intelligence

LIFT: Teaching VLA Models Force Perception via Post-Training Without Force Pretraining

Shanghai Jiao Tong University's LIFT method enables Vision-Language-Action models to learn force perception through post-training alone, achieving significant performance gains on contact-rich tasks with only 20-30 force-labeled demonstrations while preserving pretrained knowledge via weight copying and shifted causal attention.