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Rares Andrei Ambrus

12 accepted papers

2025

Can We Detect Failures Without Failure Data? Uncertainty-Aware Runtime Failure Detection for Imitation Learning Policies

RSS 2025poster

Recent years have witnessed impressive robotic manipulation systems driven by advances in imitation learning and generative modeling, such as diffusion- and flow-based approaches. As robot policy performance increases, so does the complexity and time horizon of achievable tasks, inducing unexpected…

Cited by 1PDFScholar
2025

Is Your Imitation Learning Policy Better than Mine? Policy Comparison with Near-Optimal Stopping

RSS 2025poster

Imitation learning has enabled robots to perform complex, long-horizon tasks in challenging dexterous manipulation settings. As new methods are developed, they must be rigorously evaluated and compared against corresponding baselines through repeated evaluation trials. However, policy comparison is…

Cited by 1PDFScholar
2025

Real2Render2Real: Scaling Robot Data Without Dynamics Simulation or Robot Hardware

CoRL 2025oral

Scaling robot learning requires vast and diverse datasets. Yet the prevailing data collection paradigm—human teleoperation—remains costly and constrained by manual effort and physical robot access. We introduce Real2Render2Real (R2R2R), a novel approach for generating robot training data without rel…

Cited by 0SourceScholar
2025

SplArt: Articulation Estimation and Part-Level Reconstruction with 3D Gaussian Splatting

ICCV 2025poster

Reconstructing articulated objects prevalent in daily environments is crucial for applications in augmented/virtual reality and robotics. However, existing methods face scalability limitations (requiring 3D supervision or costly annotations), robustness issues (being susceptible to local optima), an…

2025

Understanding Complexity in VideoQA via Visual Program Generation

ICML 2025poster

We propose a data-driven approach to analyzing query complexity in Video Question Answering (VideoQA). Previous efforts in benchmark design have relied on human expertise to design challenging questions, yet we experimentally show that humans struggle to predict which questions are difficult for mac…

Cited by 0SourcePDFScholar
2024

$SE(3)$ Equivariant Ray Embeddings for Implicit Multi-View Depth Estimation

NeurIPS 2024poster

Incorporating inductive bias by embedding geometric entities (such as rays) as input has proven successful in multi-view learning. However, the methods adopting this technique typically lack equivariance, which is crucial for effective 3D learning. Equivariance serves as a valuable inductive prior,…

Cited by 1SourcePDFScholar
2023

CARTO: Category and Joint Agnostic Reconstruction of ARTiculated Objects

CVPR 2023poster

We present CARTO, a novel approach for reconstructing multiple articulated objects from a single stereo RGB observation. We use implicit object-centric representations and learn a single geometry and articulation decoder for multiple object categories. Despite training on multiple categories, our de…

2023

Neural Groundplans: Persistent Neural Scene Representations from a Single Image

ICLR 2023poster

We present a method to map 2D image observations of a scene to a persistent 3D scene representation, enabling novel view synthesis and disentangled representation of the movable and immovable components of the scene. Motivated by the bird’s-eye-view (BEV) representation commonly used in vision and r…

Cited by 13SourcePDFScholar
2023

Viewpoint Equivariance for Multi-View 3D Object Detection

CVPR 2023poster

3D object detection from visual sensors is a cornerstone capability of robotic systems. State-of-the-art methods focus on reasoning and decoding object bounding boxes from multi-view camera input. In this work we gain intuition from the integral role of multi-view consistency in 3D scene understandi…

2022

ROAD: Learning an Implicit Recursive Octree Auto-Decoder to Efficiently Encode 3D Shapes

CoRL 2022poster

Compact and accurate representations of 3D shapes are central to many perception and robotics tasks. State-of-the-art learning-based methods can reconstruct single objects but scale poorly to large datasets. We present a novel recursive implicit representation to efficiently and accurately encode la…

Cited by 5SourceScholar
2022

Representation Learning for Object Detection from Unlabeled Point Cloud Sequences

CoRL 2022poster

Although unlabeled 3D data is easy to collect, state-of-the-art machine learning techniques for 3D object detection still rely on difficult-to-obtain manual annotations. To reduce dependence on the expensive and error-prone process of manual labeling, we propose a technique for representation learni…

Cited by 7SourceScholar
2021

Single-Shot Scene Reconstruction

CoRL 2021poster

We introduce a novel scene reconstruction method to infer a fully editable and re-renderable model of a 3D road scene from a single image. We represent movable objects separately from the immovable background, and recover a full 3D model of each distinct object as well as their spatial relations in…

Cited by 18SourceScholar