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Alexander Sax

13 accepted papers

2025

Fast3R: Towards 3D Reconstruction of 1000+ Images in One Forward Pass

CVPR 2025poster

Multi-view 3D reconstruction remains a core challenge in computer vision, particularly in applications requiring accurate and scalable representations across diverse perspectives. Current leading methods such as DUSt3R employ a fundamentally pairwise approach, processing images in pairs and necessit…

2025

From Thousands to Billions: 3D Visual Language Grounding via Render-Supervised Distillation from 2D VLMs

ICML 2025poster

3D vision-language grounding faces a fundamental data bottleneck: while 2D models train on billions of images, 3D models have access to only thousands of labeled scenes--a six-order-of-magnitude gap that severely limits performance. We introduce \textbf{\emph{LIFT-GS}}, a practical distillation tech…

2025

LOCATE 3D: Real-World Object Localization via Self-Supervised Learning in 3D

ICML 2025spotlight

We present LOCATE 3D, a model for localizing objects in 3D scenes from referring expressions like "the small coffee table between the sofa and the lamp." LOCATE 3D sets a new state-of-the-art on standard referential grounding benchmarks and showcases robust generalization capabilities. Notably, LOCA…

Cited by 0SourcePDFScholar
2025

Unifying 2D and 3D Vision-Language Understanding

ICML 2025poster

Progress in 3D vision-language learning has been hindered by the scarcity of large-scale 3D datasets. We introduce UniVLG, a unified architecture for 2D and 3D vision-language understanding that bridges the gap between existing 2D-centric models and the rich 3D sensory data available in embodied sys…

2024

OpenEQA: Embodied Question Answering in the Era of Foundation Models

CVPR 2024poster

We present a modern formulation of Embodied Question Answering (EQA) as the task of understanding an environment well enough to answer questions about it in natural language. An agent can achieve such an understanding by either drawing upon episodic memory exemplified by agents on smart glasses or b…

Cited by 118SourcePDFScholar
2021

Omnidata: A Scalable Pipeline for Making Multi-Task Mid-Level Vision Datasets From 3D Scans

ICCV 2021poster

Computer vision now relies on data, but we know surprisingly little about what factors in the data affect performance. We argue that this stems from the way data is collected. Designing and collecting static datasets of images (or videos) locks us in to specific design choices and limits us to post-…

Cited by 299PDFcodeScholar
2020

Robust Learning Through Cross-Task Consistency

CVPR 2020oral

Visual perception entails solving a wide set of tasks (e.g., object detection, depth estimation, etc). The predictions made for different tasks out of one image are not independent, and therefore, are expected to be 'consistent'. We propose a flexible and fully computational framework for learning w…

Cited by 187PDFcodeScholar
2020

Robust Policies via Mid-Level Visual Representations: An Experimental Study in Manipulation and Navigation

CoRL 2020

Vision-based robotics often factors the control loop into separate components for perception and control. Conventional perception components usually extract hand-engineered features from the visual input that are then used by the control component in an explicit manner. In contrast, recent advances

Cited by 0SourcePDFScholar
2020

Side-Tuning: A Baseline for Network Adaptation via Additive Side Networks

ECCV 2020poster

When training a neural network for a desired task, one may prefer to adapt a pre-trained network rather than starting from randomly initialized weights. Adaptation can be useful in cases when training data is scarce, when a single learner needs to perform multiple tasks, or when one wishes to encode…

Cited by 257SourcePDFScholar
2019

Learning to Navigate Using Mid-Level Visual Priors

CoRL 2019

How much does having visual priors about the world (e.g. the fact that the world is 3D) assist in learning to perform downstream motor tasks (e.g. navigating a complex environment)? What are the consequences of not utilizing such visual priors in learning? We study these questions by integrating a g

2018

Gibson Env: Real-World Perception for Embodied Agents

CVPR 2018poster

Perception and being active (having a certain level of motion freedom) are closely tied. Learning active perception and sensorimotor control in the physical world is cumbersome as existing algorithms are too slow to efficiently learn in real-time and robots are fragile and costly. This has given ris…

2018

Taskonomy: Disentangling Task Transfer Learning

CVPR 2018poster

Do visual tasks have a relationship, or are they unrelated? For instance, could having surface normals simplify estimating the depth of an image? Intuition answers these questions positively, implying existence of a structure among visual tasks. Knowing this structure has notable uses; it is the con…