Diffusion Policy: Visuomotor Policy for Robot Behavior Generation
핵심 개념
新しいロボット行動生成方法、Diffusion Policyの導入とその利点を紹介します。
초록
Abstract:
Diffusion Policy introduces a new method for generating robot behavior by representing a robot’s visuomotor policy as a conditional denoising diffusion process.
Benchmarking across various tasks shows consistent outperformance of existing methods by an average of 46.9%.
Introduction:
Policy learning from demonstration is distinct and challenging due to multimodal distributions, sequential correlation, and high precision requirements.
Diffusion Policy Formulation:
Denoising Diffusion Probabilistic Models (DDPMs) are used to model complex multimodal action distributions and ensure stable training behavior.
Key Design Decisions:
Choice of neural network architectures impacts performance, with transformer-based models showing better scalability to high-dimensional output spaces.
Benefits of Action-Sequence Prediction:
Diffusion Policy's ability to predict action sequences encourages temporal consistency and robustness against idle actions.
Training Stability:
Diffusion Policy's stability in training is attributed to sidestepping the estimation of normalization constants in energy-based models.
Realworld Evaluation:
Diffusion Policy demonstrates close-to-human performance on the real-world Push-T task, showcasing its effectiveness in practical applications.