Search Results for author: Alex Bronstein

Found 44 papers, 19 papers with code

Classifier Robustness Enhancement Via Test-Time Transformation

1 code implementation27 Mar 2023 Tsachi Blau, Roy Ganz, Chaim Baskin, Michael Elad, Alex Bronstein

We show that the proposed method achieves state-of-the-art results and validate our claim through extensive experiments on a variety of defense methods, classifier architectures, and datasets.

Adversarial Attack

Multi PILOT: Learned Feasible Multiple Acquisition Trajectories for Dynamic MRI

1 code implementation13 Mar 2023 Tamir Shor, Tomer Weiss, Dor Noti, Alex Bronstein

Several studies have particularly focused on applying deep learning techniques to learn these acquisition trajectories in order to attain better image reconstruction, rather than using some predefined set of trajectories.

Image Reconstruction

Threat Model-Agnostic Adversarial Defense using Diffusion Models

1 code implementation17 Jul 2022 Tsachi Blau, Roy Ganz, Bahjat Kawar, Alex Bronstein, Michael Elad

Deep Neural Networks (DNNs) are highly sensitive to imperceptible malicious perturbations, known as adversarial attacks.

Adversarial Defense Denoising

Joint optimization of system design and reconstruction in MIMO radar imaging

no code implementations7 Oct 2021 Tomer Weiss, Nissim Peretz, Sanketh Vedula, Arie Feuer, Alex Bronstein

Inspired by these successes, in this work, we propose to learn MIMO acquisition parameters in the form of receive (Rx) antenna elements locations jointly with an image neural-network based reconstruction.

Image Reconstruction

GRASP: Graph Alignment through Spectral Signatures

no code implementations10 Jun 2021 Judith Hermanns, Anton Tsitsulin, Marina Munkhoeva, Alex Bronstein, Davide Mottin, Panagiotis Karras

In this paper, we transfer the shape-analysis concept of functional maps from the continuous to the discrete case, and treat the graph alignment problem as a special case of the problem of finding a mapping between functions on graphs.

Self-Supervised Classification Network

2 code implementations19 Mar 2021 Elad Amrani, Leonid Karlinsky, Alex Bronstein

To guarantee non-degenerate solutions (i. e., solutions where all labels are assigned to the same class) we propose a mathematically motivated variant of the cross-entropy loss that has a uniform prior asserted on the predicted labels.

Classification Clustering +5

ISP Distillation

no code implementations25 Jan 2021 Eli Schwartz, Alex Bronstein, Raja Giryes

We then train a model that is applied directly to the RAW data by using knowledge distillation such that the model predictions for RAW images will be aligned with the predictions of an off-the-shelf pre-trained model for processed RGB images.

Knowledge Distillation Object Recognition +1

Non-Rigid Puzzles

no code implementations26 Nov 2020 Or Litany, Emanuele Rodolà, Alex Bronstein, Michael Bronstein, Daniel Cremers

We assume to be given a reference shape and its multiple parts undergoing a non-rigid deformation.

3D FLAT: Feasible Learned Acquisition Trajectories for Accelerated MRI

1 code implementation11 Aug 2020 Jonathan Alush-Aben, Linor Ackerman-Schraier, Tomer Weiss, Sanketh Vedula, Ortal Senouf, Alex Bronstein

Magnetic Resonance Imaging (MRI) has long been considered to be among the gold standards of today's diagnostic imaging.

Image Reconstruction

Do We Need Depth in State-Of-The-Art Face Authentication?

no code implementations24 Mar 2020 Amir Livne, Alex Bronstein, Ron Kimmel, Ziv Aviv, Shahaf Grofit

The raw face stereo images along with the location in the image from which the face is extracted allow the proposed CNN to improve the recognition task while avoiding the need to explicitly handle the geometric structure of the face.

Face Recognition

Noise Estimation Using Density Estimation for Self-Supervised Multimodal Learning

1 code implementation6 Mar 2020 Elad Amrani, Rami Ben-Ari, Daniel Rotman, Alex Bronstein

One of the key factors of enabling machine learning models to comprehend and solve real-world tasks is to leverage multimodal data.

Ranked #3 on Visual Question Answering on MSRVTT-QA (Accuracy metric)

Density Estimation Noise Estimation +8

Robust Quantization: One Model to Rule Them All

1 code implementation NeurIPS 2020 Moran Shkolnik, Brian Chmiel, Ron Banner, Gil Shomron, Yury Nahshan, Alex Bronstein, Uri Weiser

Neural network quantization methods often involve simulating the quantization process during training, making the trained model highly dependent on the target bit-width and precise way quantization is performed.

Quantization

MetAdapt: Meta-Learned Task-Adaptive Architecture for Few-Shot Classification

no code implementations1 Dec 2019 Sivan Doveh, Eli Schwartz, Chao Xue, Rogerio Feris, Alex Bronstein, Raja Giryes, Leonid Karlinsky

In this work, we propose to employ tools inspired by the Differentiable Neural Architecture Search (D-NAS) literature in order to optimize the architecture for FSL without over-fitting.

Classification Few-Shot Learning +2

Spectral Geometric Matrix Completion

1 code implementation17 Nov 2019 Amit Boyarski, Sanketh Vedula, Alex Bronstein

Deep Matrix Factorization (DMF) is an emerging approach to the problem of matrix completion.

Matrix Completion Recommendation Systems

Localization with Limited Annotation for Chest X-rays

no code implementations19 Sep 2019 Eyal Rozenberg, Daniel Freedman, Alex Bronstein

We present such a technique for localization with limited annotation, in which the number of images with bounding boxes can be a small fraction of the total dataset (e. g. less than 1%); all other images only possess a whole image label and no bounding box.

Weakly-supervised Learning

Horizontal Flows and Manifold Stochastics in Geometric Deep Learning

no code implementations13 Sep 2019 Stefan Sommer, Alex Bronstein

We introduce two constructions in geometric deep learning for 1) transporting orientation-dependent convolutional filters over a manifold in a continuous way and thereby defining a convolution operator that naturally incorporates the rotational effect of holonomy; and 2) allowing efficient evaluation of manifold convolution layers by sampling manifold valued random variables that center around a weighted diffusion mean.

PILOT: Physics-Informed Learned Optimized Trajectories for Accelerated MRI

2 code implementations12 Sep 2019 Tomer Weiss, Ortal Senouf, Sanketh Vedula, Oleg Michailovich, Michael Zibulevsky, Alex Bronstein

Such schemes have already demonstrated substantial effectiveness, leading to considerably shorter acquisition times and improved quality of image reconstruction.

Image Reconstruction Image Segmentation +1

The Shape of Data: Intrinsic Distance for Data Distributions

2 code implementations ICLR 2020 Anton Tsitsulin, Marina Munkhoeva, Davide Mottin, Panagiotis Karras, Alex Bronstein, Ivan Oseledets, Emmanuel Müller

The ability to represent and compare machine learning models is crucial in order to quantify subtle model changes, evaluate generative models, and gather insights on neural network architectures.

Learning to Detect and Retrieve Objects from Unlabeled Videos

1 code implementation27 May 2019 Elad Amrani, Rami Ben-Ari, Tal Hakim, Alex Bronstein

In this work, we propose to exploit the natural correlation in narrations and the visual presence of objects in video, to learn an object detector and retrieval without any manual labeling involved.

Clustering Learning with noisy labels +6

Joint learning of cartesian undersampling and reconstruction for accelerated MRI

1 code implementation22 May 2019 Tomer Weiss, Sanketh Vedula, Ortal Senouf, Oleg Michailovich, Michael Zibulevsky, Alex Bronstein

On the other hand, recent works in optical computational imaging have demonstrated growing success of the simultaneous learning-based design of the acquisition and reconstruction schemes manifesting significant improvement in the reconstruction quality with a constrained time budget.

Image Reconstruction

Self-supervised learning of inverse problem solvers in medical imaging

no code implementations22 May 2019 Ortal Senouf, Sanketh Vedula, Tomer Weiss, Alex Bronstein, Oleg Michailovich, Michael Zibulevsky

In light of this, we propose a self-supervised approach to training inverse models in medical imaging in the absence of aligned data.

Self-Supervised Learning

Learning beamforming in ultrasound imaging

no code implementations19 Dec 2018 Sanketh Vedula, Ortal Senouf, Grigoriy Zurakhov, Alex Bronstein, Oleg Michailovich, Michael Zibulevsky

Medical ultrasound (US) is a widespread imaging modality owing its popularity to cost efficiency, portability, speed, and lack of harmful ionizing radiation.

Image Reconstruction

Self-supervised Learning of Dense Shape Correspondence

1 code implementation6 Dec 2018 Oshri Halimi, Or Litany, Emanuele Rodolà, Alex Bronstein, Ron Kimmel

The resulting learning model is class-agnostic, and is able to leverage any type of deformable geometric data for the training phase.

Self-Supervised Learning

SGR: Self-Supervised Spectral Graph Representation Learning

no code implementations15 Nov 2018 Anton Tsitsulin, Davide Mottin, Panagiotis Karras, Alex Bronstein, Emmanuel Müller

Representing a graph as a vector is a challenging task; ideally, the representation should be easily computable and conducive to efficient comparisons among graphs, tailored to the particular data and analytical task at hand.

Graph Representation Learning

NetLSD: Hearing the Shape of a Graph

1 code implementation27 May 2018 Anton Tsitsulin, Davide Mottin, Panagiotis Karras, Alex Bronstein, Emmanuel Müller

However, it is a hard task in terms of the expressiveness of the employed similarity measure and the efficiency of its computation.

Social and Information Networks

ForestHash: Semantic Hashing With Shallow Random Forests and Tiny Convolutional Networks

no code implementations ECCV 2018 Qiang Qiu, Jose Lezama, Alex Bronstein, Guillermo Sapiro

In this paper, we introduce a random forest semantic hashing scheme that embeds tiny convolutional neural networks (CNN) into shallow random forests, with near-optimal information-theoretic code aggregation among trees.

General Classification Image Classification +2

DIMAL: Deep Isometric Manifold Learning Using Sparse Geodesic Sampling

no code implementations16 Nov 2017 Gautam Pai, Ronen Talmon, Alex Bronstein, Ron Kimmel

This paper explores a fully unsupervised deep learning approach for computing distance-preserving maps that generate low-dimensional embeddings for a certain class of manifolds.

Efficient Deformable Shape Correspondence via Kernel Matching

1 code implementation25 Jul 2017 Zorah Lähner, Matthias Vestner, Amit Boyarski, Or Litany, Ron Slossberg, Tal Remez, Emanuele Rodolà, Alex Bronstein, Michael Bronstein, Ron Kimmel, Daniel Cremers

We present a method to match three dimensional shapes under non-isometric deformations, topology changes and partiality.

Product Manifold Filter: Non-Rigid Shape Correspondence via Kernel Density Estimation in the Product Space

no code implementations CVPR 2017 Matthias Vestner, Roee Litman, Emanuele Rodolà, Alex Bronstein, Daniel Cremers

Many algorithms for the computation of correspondences between deformable shapes rely on some variant of nearest neighbor matching in a descriptor space.

Density Estimation

Cloud Dictionary: Sparse Coding and Modeling for Point Clouds

3 code implementations15 Dec 2016 Or Litany, Tal Remez, Alex Bronstein

With the development of range sensors such as LIDAR and time-of-flight cameras, 3D point cloud scans have become ubiquitous in computer vision applications, the most prominent ones being gesture recognition and autonomous driving.

Autonomous Driving Denoising +1

Hamiltonian operator for spectral shape analysis

no code implementations7 Nov 2016 Yoni Choukroun, Alon Shtern, Alex Bronstein, Ron Kimmel

Many shape analysis methods treat the geometry of an object as a metric space that can be captured by the Laplace-Beltrami operator.

Consistent Discretization and Minimization of the L1 Norm on Manifolds

no code implementations18 Sep 2016 Alex Bronstein, Yoni Choukroun, Ron Kimmel, Matan Sela

The L1 norm has been tremendously popular in signal and image processing in the past two decades due to its sparsity-promoting properties.

Bayesian Inference of Bijective Non-Rigid Shape Correspondence

no code implementations12 Jul 2016 Matthias Vestner, Roee Litman, Alex Bronstein, Emanuele Rodolà, Daniel Cremers

Many algorithms for the computation of correspondences between deformable shapes rely on some variant of nearest neighbor matching in a descriptor space.

Bayesian Inference

Image reconstruction from dense binary pixels

no code implementations6 Dec 2015 Or Litany, Tal Remez, Alex Bronstein

Recently, the dense binary pixel Gigavision camera had been introduced, emulating a digital version of the photographic film.

Image Reconstruction

ASIST: Automatic Semantically Invariant Scene Transformation

no code implementations4 Dec 2015 Or Litany, Tal Remez, Daniel Freedman, Lior Shapira, Alex Bronstein, Ran Gal

We present ASIST, a technique for transforming point clouds by replacing objects with their semantically equivalent counterparts.

Object

A Picture is Worth a Billion Bits: Real-Time Image Reconstruction from Dense Binary Pixels

no code implementations15 Oct 2015 Tal Remez, Or Litany, Alex Bronstein

In this work, we study a variant of a sensor with binary threshold pixels and propose a reconstruction algorithm combining an ML data fitting term with a sparse synthesis prior.

Image Reconstruction Quantization

Random Forests Can Hash

no code implementations16 Dec 2014 Qiang Qiu, Guillermo Sapiro, Alex Bronstein

Traditional random forest fails to enforce the consistency of hashes generated from each tree for the same class data, i. e., to preserve the underlying similarity, and it also lacks a principled way for code aggregation across trees.

Retrieval

Graph matching: relax or not?

no code implementations29 Jan 2014 Yonathan Aflalo, Alex Bronstein, Ron Kimmel

We consider the problem of exact and inexact matching of weighted undirected graphs, in which a bijective correspondence is sought to minimize a quadratic weight disagreement.

Graph Matching valid

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