Search Results for author: Laura Toni

Found 21 papers, 3 papers with code

AGAR: Attention Graph-RNN for Adaptative Motion Prediction of Point Clouds of Deformable Objects

1 code implementation19 Jul 2023 Pedro Gomes, Silvia Rossi, Laura Toni

From this understanding, we propose an improved architecture for point cloud prediction of deformable 3D objects.

Action Recognition motion prediction

Online Network Source Optimization with Graph-Kernel MAB

no code implementations7 Jul 2023 Laura Toni, Pascal Frossard

To achieve sample efficiency, we describe the network processes with an adaptive graph dictionary model, which typically leads to sparse spectral representations.

MiDi: Mixed Graph and 3D Denoising Diffusion for Molecule Generation

1 code implementation17 Feb 2023 Clement Vignac, Nagham Osman, Laura Toni, Pascal Frossard

This work introduces MiDi, a novel diffusion model for jointly generating molecular graphs and their corresponding 3D arrangement of atoms.

Denoising

Learning Algorithm Generalization Error Bounds via Auxiliary Distributions

no code implementations2 Oct 2022 Gholamali Aminian, Saeed Masiha, Laura Toni, Miguel R. D. Rodrigues

Additionally, we demonstrate how our auxiliary distribution method can be used to derive the upper bounds on excess risk of some learning algorithms in the supervised learning context {\blue and the generalization error under the distribution mismatch scenario in supervised learning algorithms, where the distribution mismatch is modeled as $\alpha$-Jensen-Shannon or $\alpha$-R\'enyi divergence between the distribution of test and training data samples distributions.}

Semi-supervised Batch Learning From Logged Data

no code implementations15 Sep 2022 Gholamali Aminian, Armin Behnamnia, Roberto Vega, Laura Toni, Chengchun Shi, Hamid R. Rabiee, Omar Rivasplata, Miguel R. D. Rodrigues

We propose learning methods for problems where feedback is missing for some samples, so there are samples with feedback and samples missing-feedback in the logged data.

counterfactual

An Information-theoretical Approach to Semi-supervised Learning under Covariate-shift

no code implementations24 Feb 2022 Gholamali Aminian, Mahed Abroshan, Mohammad Mahdi Khalili, Laura Toni, Miguel R. D. Rodrigues

A common assumption in semi-supervised learning is that the labeled, unlabeled, and test data are drawn from the same distribution.

An Exact Characterization of the Generalization Error for the Gibbs Algorithm

no code implementations NeurIPS 2021 Gholamali Aminian, Yuheng Bu, Laura Toni, Miguel Rodrigues, Gregory Wornell

Various approaches have been developed to upper bound the generalization error of a supervised learning algorithm.

Characterizing and Understanding the Generalization Error of Transfer Learning with Gibbs Algorithm

no code implementations2 Nov 2021 Yuheng Bu, Gholamali Aminian, Laura Toni, Miguel Rodrigues, Gregory Wornell

We provide an information-theoretic analysis of the generalization ability of Gibbs-based transfer learning algorithms by focusing on two popular transfer learning approaches, $\alpha$-weighted-ERM and two-stage-ERM.

Transfer Learning

Spatio-temporal Graph-RNN for Point Cloud Prediction

1 code implementation15 Feb 2021 Pedro Gomes, Silvia Rossi, Laura Toni

In this paper, we propose an end-to-end learning network to predict future frames in a point cloud sequence.

Graph signal processing for machine learning: A review and new perspectives

no code implementations31 Jul 2020 Xiaowen Dong, Dorina Thanou, Laura Toni, Michael Bronstein, Pascal Frossard

The effective representation, processing, analysis, and visualization of large-scale structured data, especially those related to complex domains such as networks and graphs, are one of the key questions in modern machine learning.

BIG-bench Machine Learning Computational Efficiency

Differentiable Linear Bandit Algorithm

no code implementations4 Jun 2020 Kaige Yang, Laura Toni

Theoretically, we show that the proposed algorithm achieves a $\tilde{\mathcal{O}}(\hat{\beta}\sqrt{dT})$ upper bound of $T$-round regret, where $d$ is the dimension of arm features and $\hat{\beta}$ is the learned size of confidence bound.

State2vec: Off-Policy Successor Features Approximators

no code implementations22 Oct 2019 Sephora Madjiheurem, Laura Toni

In this paper, we propose state2vec, an efficient and low-complexity framework for learning successor features which (i) generalize across policies, (ii) ensure sample-efficiency during meta-test.

Meta Reinforcement Learning reinforcement-learning +1

Laplacian-regularized graph bandits: Algorithms and theoretical analysis

no code implementations12 Jul 2019 Kaige Yang, Xiaowen Dong, Laura Toni

In terms of network regret (sum of cumulative regret over $n$ users), the proposed algorithm leads to a scaling as $\tilde{\mathcal{O}}(\Psi d\sqrt{nT})$, which is a significant improvement over $\tilde{\mathcal{O}}(nd\sqrt{T})$ in the state-of-the-art algorithm \algo{Gob. Lin} \Ccite{cesa2013gang}.

Error Analysis on Graph Laplacian Regularized Estimator

no code implementations11 Feb 2019 Kaige Yang, Xiaowen Dong, Laura Toni

We provide a theoretical analysis of the representation learning problem aimed at learning the latent variables (design matrix) $\Theta$ of observations $Y$ with the knowledge of the coefficient matrix $X$.

Representation Learning

Representation Learning on Graphs: A Reinforcement Learning Application

no code implementations16 Jan 2019 Sephora Madjiheurem, Laura Toni

In this work, we study value function approximation in reinforcement learning (RL) problems with high dimensional state or action spaces via a generalized version of representation policy iteration (RPI).

reinforcement-learning Reinforcement Learning (RL) +1

Graph-Based Recommendation System

no code implementations31 Jul 2018 Kaige Yang, Laura Toni

In this work, we study recommendation systems modelled as contextual multi-armed bandit (MAB) problems.

Recommendation Systems

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