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Roger Girgis

5 accepted papers

2025

Scenario Dreamer: Vectorized Latent Diffusion for Generating Driving Simulation Environments

CVPR 2025poster

We introduce Scenario Dreamer, a fully data-driven generative simulator for autonomous vehicle planning that generates both the initial traffic scene--comprising a lane graph and agent bounding boxes--and closed-loop agent behaviours. Existing methods for generating driving simulation environments e…

Cited by 3Source ↗PDF ↗Scholar ↗
2024

CtRL-Sim: Reactive and Controllable Driving Agents with Offline Reinforcement Learning

CoRL 2024poster

Evaluating autonomous vehicle stacks (AVs) in simulation typically involves replaying driving logs from real-world recorded traffic. However, agents replayed from offline data are not reactive and hard to intuitively control. Existing approaches address these challenges by proposing methods that rel…

Cited by 6Source ↗Scholar ↗
2022

Direct Behavior Specification via Constrained Reinforcement Learning

ICML 2022spotlight

The standard formulation of Reinforcement Learning lacks a practical way of specifying what are admissible and forbidden behaviors. Most often, practitioners go about the task of behavior specification by manually engineering the reward function, a counter-intuitive process that requires several ite…

2022

Latent Variable Sequential Set Transformers for Joint Multi-Agent Motion Prediction

ICLR 2022spotlight

Robust multi-agent trajectory prediction is essential for the safe control of robotic systems. A major challenge is to efficiently learn a representation that approximates the true joint distribution of contextual, social, and temporal information to enable planning. We propose Latent Variable Seque…

2019

Navigation Agents for the Visually Impaired: A Sidewalk Simulator and Experiments

CoRL 2019

Millions of blind and visually-impaired (BVI) people navigate urban environments everyday, using smartphones for high-level path-planning and white canes or guide dogs for local information. However, many BVI people still struggle to travel to new places. In our endeavour to create a navigation assi