AI

Video understanding has reached a critical juncture with the rise of Large Multimodal Models. A groundbreaking survey from the University of Rochester explores how post-training methods transform basic video perception into advanced reasoning systems. The research identifies three key pillars: Supervised Fine-Tuning with chain-of-thought reasoning, Reinforcement Learning using Group Relative Policy Optimization, and Test-Time Scaling for improved reliability. These techniques address unique challenges in video processing, including temporal localization, spatiotemporal grounding, and multimodal integration. The survey curates essential benchmarks and evaluation protocols, emphasizing standardized reporting. Looking ahead, researchers highlight promising directions such as structured reasoning interfaces, compositional rewards, and confidence-aware systems. This comprehensive examination provides a unified framework and roadmap for advancing video understanding capabilities.

Behavior Best-of-N (bBoN) revolutionizes computer-use agents by generating multiple solution attempts and intelligently selecting the best one. This “wide scaling” approach, developed by Simular Research, dramatically improves task success rates, reaching 69.9% accuracy on benchmarks—nearly matching human performance at 72%. The framework’s key components, the Behavior Narrative Generator and Best-of-N Judge, efficiently summarize and compare solution trajectories. Built upon Agent S2 and introducing Agent S3, bBoN demonstrates consistent improvements with increased rollouts and model diversity. It shows strong generalization across different operating systems and suggests a promising direction for deploying reliable computer-use agents in real-world applications, despite some limitations in shared resource management.