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Coupled Local and Global World Models for Efficient First Order RL
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Coupled Local and Global World Models for Efficient First Order RL

#World Models #Reinforcement Learning #Locomotion #arXiv #Computational Efficiency #Neural Networks #Computer Vision

📌 Key Takeaways

  • Researchers have introduced a coupled local and global world model to improve Reinforcement Learning efficiency.
  • The new model addresses the high computational cost typically associated with evaluating complex environmental dynamics.
  • Standard simulators often struggle with non-rigidity and contact physics, whereas world models excel but are traditionally slow.
  • The research aims to enable better locomotion and visual perception in robotic systems through optimized first-order RL.

📖 Full Retelling

A team of researchers submitted a groundbreaking study to the arXiv preprint server on February 10, 2025, proposing a new architecture of coupled local and global world models to overcome the computational inefficiencies currently hindering first-order Reinforcement Learning (RL). The paper aims to bridge the gap between high-fidelity environmental simulations and the practical speed required for training robots to perform complex locomotion tasks. By restructuring how models process sensory data and physical dynamics, the authors seek to solve the bottleneck where standard simulators fail to capture intricate interactions like non-rigid body contact and complex visual perception. Traditionally, world models have been lauded for their ability to mirror reality more accurately than rigid simulators, particularly when dealing with soft-body physics or nuanced optical inputs. However, the sheer mathematical complexity of evaluating these models has historically made them too slow for use with popular RL algorithms, which often require millions of iterations to converge on a solution. This technical limitation has prevented widespread adoption of world models in real-time robotic training, forcing developers to rely on simplified simulations that often lead to the 'reality gap'—where a robot fails in the real world despite succeeding in a virtual one. The proposed framework introduces a dual-layered approach that separates local dynamics from global environmental representations. This coupling allows the system to focus computational resources on immediate physical interactions while maintaining a broader understanding of the agent's surroundings. By optimizing the first-order gradients within this structure, the researchers demonstrate that RL agents can learn more efficiently without sacrificing the descriptive power of the world model. This advancement could significantly impact the development of autonomous systems, making them more adaptable to unpredictable physical environments.

🏷️ Themes

Artificial Intelligence, Robotics, Machine Learning

📚 Related People & Topics

Locomotion

Topics referred to by the same term

Locomotion means the act or ability of something to transport or move itself from place to place.

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Neural network

Structure in biology and artificial intelligence

A neural network is a group of interconnected units called neurons that send signals to one another. Neurons can be either biological cells or mathematical models. While individual neurons are simple, many of them together in a network can perform complex tasks.

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Reinforcement learning

Reinforcement learning

Field of machine learning

In machine learning and optimal control, reinforcement learning (RL) is concerned with how an intelligent agent should take actions in a dynamic environment in order to maximize a reward signal. Reinforcement learning is one of the three basic machine learning paradigms, alongside supervised learnin...

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📄 Original Source Content
arXiv:2602.06219v1 Announce Type: cross Abstract: World models offer a promising avenue for more faithfully capturing complex dynamics, including contacts and non-rigidity, as well as complex sensory information, such as visual perception, in situations where standard simulators struggle. However, these models are computationally complex to evaluate, posing a challenge for popular RL approaches that have been successfully used with simulators to solve complex locomotion tasks but yet struggle w

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