no code implementations • 17 Dec 2024 • Juan Del Aguila Ferrandis, João Moura, Sethu Vijayakumar
We formulate the estimator within a Bayesian deep learning framework, to model its uncertainty, and then train uncertainty-aware control policies by incorporating the pre-learned estimator into the reinforcement learning (RL) loop, both of which lead to significantly improved estimator and policy performance.
no code implementations • 19 Aug 2024 • Gen Li, Nikolaos Tsagkas, Jifei Song, Ruaridh Mon-Williams, Sethu Vijayakumar, Kun Shao, Laura Sevilla-Lara
In this paper, we present a streamlined affordance learning system that encompasses data collection, effective model training, and robot deployment.
no code implementations • 15 Mar 2024 • Namiko Saito, Joao Moura, Hiroki Uchida, Sethu Vijayakumar
Recognising the characteristics of objects while a robot handles them is crucial for adjusting motions that ensure stable and efficient interactions with containers.
no code implementations • 8 Sep 2023 • Marina Y. Aoyama, João Moura, Namiko Saito, Sethu Vijayakumar
We validate the approach on the wiping task using sponges with different stiffness and surface friction.
no code implementations • 4 Aug 2023 • Juan Del Aguila Ferrandis, João Moura, Sethu Vijayakumar
Developing robot controllers capable of achieving dexterous nonprehensile manipulation, such as pushing an object on a table, is challenging.
no code implementations • 25 Jul 2023 • Ruaridh Mon-Williams, Theodoros Stouraitis, Sethu Vijayakumar
On the basis of this framework, we developed Behaviour-Transform (BeTrans).
no code implementations • 13 Oct 2022 • Christopher E. Mower, Theodoros Stouraitis, João Moura, Christian Rauch, Lei Yan, Nazanin Zamani Behabadi, Michael Gienger, Tom Vercauteren, Christos Bergeles, Sethu Vijayakumar
However, there is a lack of software connecting reliable contact simulation with the larger robotics ecosystem (i. e. ROS, Orocos), for a more seamless application of novel approaches, found in the literature, to existing robotic hardware.
no code implementations • 14 Mar 2022 • Carlos Mastalli, Wolfgang Merkt, Guiyang Xin, Jaehyun Shim, Michael Mistry, Ioannis Havoutis, Sethu Vijayakumar
To the best of our knowledge, our predictive controller is the first to handle actuation limits, generate agile locomotion maneuvers, and execute optimal feedback policies for low level torque control without the use of a separate whole-body controller.
no code implementations • 18 Oct 2021 • Shen Li, Theodoros Stouraitis, Michael Gienger, Sethu Vijayakumar, Julie A. Shah
Consistent state estimation is challenging, especially under the epistemic uncertainties arising from learned (nonlinear) dynamic and observation models.
no code implementations • 3 Aug 2021 • Tianwei Zhang, Huayan Zhang, Xiaofei Li, Junfeng Chen, Tin Lun Lam, Sethu Vijayakumar
Dynamic objects in the environment, such as people and other agents, lead to challenges for existing simultaneous localization and mapping (SLAM) approaches.
no code implementations • 2 Aug 2021 • Huayan Zhang, Tianwei Zhang, Tin Lun Lam, Sethu Vijayakumar
Dynamic environments that include unstructured moving objects pose a hard problem for Simultaneous Localization and Mapping (SLAM) performance.
no code implementations • 1 Nov 2020 • Carlo Tiseo, Vladimir Ivan, Wolfgang Merkt, Ioannis Havoutis, Michael Mistry, Sethu Vijayakumar
In literature, there are multiple model- and learning-based approaches that require significant computational resources to be effectively deployed and they may have limited generality.
Robotics
no code implementations • 21 Oct 2020 • Ran Long, Christian Rauch, Tianwei Zhang, Vladimir Ivan, Sethu Vijayakumar
Here, we propose to treat all dynamic parts as one rigid body and simultaneously segment and track both static and dynamic components.
Robotics
no code implementations • 2 Oct 2020 • Wolfgang Merkt, Vladimir Ivan, Traiko Dinev, Ioannis Havoutis, Sethu Vijayakumar
We demonstrate our method on a cart-pole toy problem and a quadrotor avoiding obstacles, and show that clustering samples based on inherent structure improves the warm-start quality.
1 code implementation • 1 Oct 2020 • Carlos Mastalli, Wolfgang Merkt, Josep Marti-Saumell, Henrique Ferrolho, Joan Sola, Nicolas Mansard, Sethu Vijayakumar
Differential dynamic programming (DDP) is a direct single shooting method for trajectory optimization.
no code implementations • 7 Feb 2020 • Chuanyu Yang, Kai Yuan, Wolfgang Merkt, Taku Komura, Sethu Vijayakumar, Zhibin Li
This paper presents a hierarchical framework for Deep Reinforcement Learning that acquires motor skills for a variety of push recovery and balancing behaviors, i. e., ankle, hip, foot tilting, and stepping strategies.
2 code implementations • 11 Sep 2019 • Carlos Mastalli, Rohan Budhiraja, Wolfgang Merkt, Guilhem Saurel, Bilal Hammoud, Maximilien Naveau, Justin Carpentier, Ludovic Righetti, Sethu Vijayakumar, Nicolas Mansard
Additionally, we propose a novel optimal control algorithm called Feasibility-driven Differential Dynamic Programming (FDDP).
Robotics Optimization and Control
no code implementations • 6 Mar 2018 • Helen Hastie, Katrin Lohan, Mike Chantler, David A. Robb, Subramanian Ramamoorthy, Ron Petrick, Sethu Vijayakumar, David Lane
To enable this to happen, the remote operator will need a high level of situation awareness and key to this is the transparency of what the autonomous systems are doing and why.
no code implementations • NeurIPS 2014 • Luigi Acerbi, Wei Ji Ma, Sethu Vijayakumar
Bayesian observer models are very effective in describing human performance in perceptual tasks, so much so that they are trusted to faithfully recover hidden mental representations of priors, likelihoods, or loss functions from the data.
no code implementations • NeurIPS 2010 • Konrad Rawlik, Marc Toussaint, Sethu Vijayakumar
Algorithms based on iterative local approximations present a practical approach to optimal control in robotic systems.
no code implementations • NeurIPS 2008 • Jo-Anne Ting, Mrinal Kalakrishnan, Sethu Vijayakumar, Stefan Schaal
In this paper, we focus on nonparametric regression and introduce a Bayesian formulation that, with the help of variational approximations, results in an EM-like algorithm for simultaneous estimation of regression and kernel parameters.
no code implementations • NeurIPS 2008 • Adrian Haith, Carl P. Jackson, R. C. Miall, Sethu Vijayakumar
Adaptation of visually guided reaching movements in novel visuomotor environments (e. g. wearing prism goggles) comprises not only motor adaptation but also substantial sensory adaptation, corresponding to shifts in the perceived spatial location of visual and proprioceptive cues.
no code implementations • NeurIPS 2008 • Christopher Williams, Stefan Klanke, Sethu Vijayakumar, Kian M. Chai
The inverse dynamics problem for a robotic manipulator is to compute the torques needed at the joints to drive it along a given trajectory; it is beneficial to be able to learn this function for adaptive control.