Direct Robot Configuration Space Construction using Convolutional Encoder-Decoders

Abstract

Intelligent robots must be able to perform safe and efficient motion planning in their environments. Central to modern motion planning is the configuration space. Configuration spaces define the set of configurations of a robot that result in collisions with obstacles in the workspace, ${\text{C}}_{\text{clsn}}$, and the set of configurations that do not, ${\text{C}}_{\text{free}}$. Modern approaches to motion planning first compute the configuration space and then perform motion planning using the calculated configuration space. Real-time motion planning requires accurate and efficient construction of configuration spaces. We are the first to apply a convolutional encoder-decoder framework for calculating highly accurate approximations to configuration spaces, essentially learning how the robot and physical world interact. Our model achieves an average 97.5% F1-score for predicting ${\text{C}}_{\text{free}}$ and ${\text{C}}_{\text{clsn}}$ for 2-D robotic workspaces with a dual-arm robot. Our method limits undetected collisions to less than 2.5% on robotic workspaces that involve translation, rotation, and removal of obstacles. Our model learns highly transferable features between robotic workspaces, requiring little to no fine-tuning to adapt to new transformations of obstacles in the workspace.

8 pages, 7 figures, 4 tables; Appeared at the ICML 2025 Workshop on Building Physically Plausible World Models