EXPO-FT: Sample-Efficient Reinforcement Learning Fine-Tuning for Vision-Language-Action Models

Extends the EXPO method with real-world RL post-training for VLAs using image observations, action chunking, DAgger, and on-the-fly Q-value maximization. Achieves 30/30 success on 8 challenging manipulation tasks with only ~19 min of RL data on average.