Search Results for author: Ellis Ratner

Found 5 papers, 1 papers with code

A Hamilton-Jacobi Reachability-Based Framework for Predicting and Analyzing Human Motion for Safe Planning

no code implementations29 Oct 2019 Somil Bansal, Andrea Bajcsy, Ellis Ratner, Anca D. Dragan, Claire J. Tomlin

We construct a new continuous-time dynamical system, where the inputs are the observations of human behavior, and the dynamics include how the belief over the model parameters change.

Bayesian Inference Human motion prediction +1

Efficient Iterative Linear-Quadratic Approximations for Nonlinear Multi-Player General-Sum Differential Games

1 code implementation10 Sep 2019 David Fridovich-Keil, Ellis Ratner, Anca D. Dragan, Claire J. Tomlin

We benchmark our method in a three-player general-sum simulated example, in which it takes < 0. 75 s to identify a solution and < 50 ms to solve warm-started subproblems in a receding horizon.

Systems and Control Robotics Systems and Control

Few-Shot Intent Inference via Meta-Inverse Reinforcement Learning

no code implementations ICLR 2019 Kelvin Xu, Ellis Ratner, Anca Dragan, Sergey Levine, Chelsea Finn

A significant challenge for the practical application of reinforcement learning toreal world problems is the need to specify an oracle reward function that correctly defines a task.

reinforcement-learning Reinforcement Learning (RL)

Simplifying Reward Design through Divide-and-Conquer

no code implementations7 Jun 2018 Ellis Ratner, Dylan Hadfield-Menell, Anca D. Dragan

Designing a good reward function is essential to robot planning and reinforcement learning, but it can also be challenging and frustrating.

Motion Planning

Learning a Prior over Intent via Meta-Inverse Reinforcement Learning

no code implementations31 May 2018 Kelvin Xu, Ellis Ratner, Anca Dragan, Sergey Levine, Chelsea Finn

A significant challenge for the practical application of reinforcement learning in the real world is the need to specify an oracle reward function that correctly defines a task.

reinforcement-learning Reinforcement Learning (RL)

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