publications

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2026

  1. Tech report·2026
    DiffusionGemma Technical Report
    DiffusionGemma Team
  2. Preprint·2026
    Diffusion Fine-tuning with Rewarded Moment Matching Distillation
    Alexis Jacq, Guillaume Couairon, Valentin De Bortoli, Quentin Berthet, Arnaud Doucet, Romuald Élie
  3. Preprint·2026
    Adversarial Learning of Classifier-Free Guidance Schedules
    Ashwini Pokle, Alexandre Galashov, Arnaud Doucet, Mauricio Delbracio, Valentin De Bortoli
  4. Preprint·2026
    Accelerating Speculative Diffusions via Block Verification
    Alexander Soen, Hisham Husain, Valentin De Bortoli, Arnaud Doucet
  5. Preprint·2026
    On the Wasserstein Gradient Flow Interpretation of Drifting Models
    Arthur Gretton, W. Li, Alexandre Galashov, James Thornton, Valentin De Bortoli, Arnaud Doucet
  6. Preprint·2026
    AsyncPatch Diffusion: Spatially-Flexible Image Generation
    Samuele Papa, Valentin De Bortoli, Guillaume Couairon, Daniel Sýkora, Romuald Élie, Klaus Greff
  7. Preprint·2026
    Seasoning Generative Models for a Generalization Aftertaste
    Hisham Husain, Valentin De Bortoli, Richard Nock

2025

  1. TMLR·2025
    Dimension-Free Error Estimate for Diffusion Model and Optimal Scheduling
    Valentin De Bortoli, Romuald Élie, Anna Kazeykina, Zhenjie Ren, Jiacheng Zhang
  2. NeurIPS·2025
    Progressive Inference-Time Annealing of Diffusion Models for Sampling from Boltzmann Densities
    Tara Akhound-Sadegh, Jungyoon Lee, Avishek Joey Bose, Valentin De Bortoli, Arnaud Doucet, Michael M. Bronstein, Dominique Beaini, Siamak Ravanbakhsh, Kirill Neklyudov, Alexander Tong
  3. NeurIPS·2025
    On the Edge of Memorization in Diffusion Models
    Sam Buchanan, Druv Pai, Yi-Ting Ma, Valentin De Bortoli

    Studies where diffusion models stop generalising and start reproducing their training data, and what controls the boundary between the two.

  4. ICML·2025
    Distributional Diffusion Models with Scoring Rules
    Valentin De Bortoli, Alexandre Galashov, J. Swaroop Guntupalli, Guangyao Zhou, Kevin Murphy, Arthur Gretton, Arnaud Doucet
  5. NeurIPS·2025
    From Stability of Langevin Diffusion to Convergence of Proximal MCMC for Non-Log-Concave Sampling
    Marien Renaud, Valentin De Bortoli, Arthur Leclaire, Nicolas Papadakis
  6. Preprint·2025
    Self-Speculative Masked Diffusions
    Andrew Campbell, Valentin De Bortoli, Jiaxin Shi, Arnaud Doucet
  7. Preprint·2025
    Learn to Guide Your Diffusion Model
    Alexandre Galashov, Ashwini Pokle, Arnaud Doucet, Arthur Gretton, Mauricio Delbracio, Valentin De Bortoli

2024

  1. ICML·2024
    Particle Denoising Diffusion Sampler
    Angus Phillips, Hai-Dang Dau, Michael Hutchinson, Valentin De Bortoli, George Deligiannidis, Arnaud Doucet
  2. NeurIPS·2024
    Schrödinger Bridge Flow for Unpaired Data Translation
    Valentin De Bortoli, Iryna Korshunova, Andriy Mnih, Arnaud Doucet
  3. AISTATS·2024
    Implicit Diffusion: Efficient Optimization through Stochastic Sampling
    Pierre Marion, Anna Korba, Peter L. Bartlett, Mathieu Blondel, Valentin De Bortoli, Arnaud Doucet, Felipe Llinares-López, Courtney Paquette, Quentin Berthet
  4. ICLR·2024
    Deep MMD Gradient Flow without Adversarial Training
    Alexandre Galashov, Valentin De Bortoli, Arthur Gretton
  5. SPA·2024
    Solving a Class of Fredholm Integral Equations of the First Kind via Wasserstein Gradient Flows
    Francesca R. Crucinio, Valentin De Bortoli, Arnaud Doucet, Adam M. Johansen
  6. Preprint·2024
    Target Score Matching
    Valentin De Bortoli, Michael Hutchinson, Peter Wirnsberger, Arnaud Doucet

2023

  1. NeurIPS·2023
    Diffusion Schrödinger Bridge Matching
    Yuyang Shi, Valentin De Bortoli, Andrew Campbell, Arnaud Doucet

    Reformulates the Schrodinger bridge as iterative Markovian fitting, removing the error that accumulated across outer iterations in earlier bridge solvers.

  2. ICML·2023
    SE(3) Diffusion Model with Application to Protein Backbone Generation
    Jason Yim, Brian L. Trippe, Valentin De Bortoli, Emile Mathieu, Arnaud Doucet, Regina Barzilay, Tommi Jaakkola

    A diffusion model on SE(3) that generates protein backbones by denoising the rigid-body frame of each residue.

  3. NeurIPS·2023
    Trans-Dimensional Generative Modeling via Jump Diffusion Models
    Andrew Campbell, William Harvey, Christian Weilbach, Valentin De Bortoli, Tom Rainforth, Arnaud Doucet
  4. ICLR·2023
    Nearly d-Linear Convergence Bounds for Diffusion Models via Stochastic Localization
    Joe Benton, Valentin De Bortoli, Arnaud Doucet, George Deligiannidis
  5. ICLR·2023
    Particle Guidance: Non-I.I.D. Diverse Sampling with Diffusion Models
    Gabriele Corso, Yilun Xu, Valentin De Bortoli, Regina Barzilay, Tommi Jaakkola
  6. NeurIPS·2023
    Tree-Based Diffusion Schrödinger Bridge with Applications to Wasserstein Barycenters
    Maxence Noble, Valentin De Bortoli, Arnaud Doucet, Alain Durmus
  7. NeurIPS·2023
    Metropolis Sampling for Constrained Diffusion Models
    Nic Fishman, Leo Klarner, Emile Mathieu, Michael Hutchinson, Valentin De Bortoli
  8. NeurIPS·2023
    Geometric Neural Diffusion Processes
    Emile Mathieu, Vincent Dutordoir, Michael Hutchinson, Valentin De Bortoli, Yee Whye Teh, Richard E. Turner
  9. ICLR·2023
    Plug-and-Play Posterior Sampling under Mismatched Measurement and Prior Models
    Marien Renaud, Jiaming Liu, Valentin De Bortoli, Andrés Almansa, Ulugbek Kamilov
  10. TMLR·2023
    Diffusion Models for Constrained Domains
    Nic Fishman, Leo Klarner, Valentin De Bortoli, Emile Mathieu, Michael Hutchinson
  11. Preprint·2023
    Augmented Bridge Matching
    Valentin De Bortoli, Guan-Horng Liu, Tianrong Chen, Evangelos A. Theodorou, Weili Nie
  12. Preprint·2023
    Diffusion Schrödinger Bridges for Bayesian Computation
    Jeremy Heng, Valentin De Bortoli, Arnaud Doucet

2022

  1. TMLR·2022
    Convergence of Denoising Diffusion Models under the Manifold Hypothesis
    Valentin De Bortoli

    Convergence guarantees for denoising diffusions when the data lies on a low-dimensional manifold - the regime where the score is unbounded and earlier analyses break down.

  2. JRSS-B·2022
    From Denoising Diffusions to Denoising Markov Models
    Joe Benton, Yuyang Shi, Valentin De Bortoli, George Deligiannidis, Arnaud Doucet
  3. NeurIPS·2022
    Riemannian Score-Based Generative Modelling
    Valentin De Bortoli, Emile Mathieu, Michael Hutchinson, James Thornton, Yee Whye Teh, Arnaud Doucet

    Extends score-based generative models from Euclidean space to Riemannian manifolds, so data living on spheres, tori and other geometries is modelled in its own coordinates.

  4. NeurIPS·2022
    A Continuous Time Framework for Discrete Denoising Models
    Andrew Campbell, Joe Benton, Valentin De Bortoli, Tom Rainforth, George Deligiannidis, Arnaud Doucet
  5. NeurIPS·2022
    Wavelet Score-Based Generative Modeling
    Florentin Guth, Simon Coste, Valentin De Bortoli, Stéphane Mallat
  6. NeurIPS·2022
    Can Push-Forward Generative Models Fit Multimodal Distributions?
    Antoine Salmona, Valentin De Bortoli, Julie Delon, Agnès Desolneux
  7. NeurIPS·2022
    Unbiased Constrained Sampling with Self-Concordant Barrier Hamiltonian Monte Carlo
    Maxence Noble, Valentin De Bortoli, Alain Durmus
  8. UAI·2022
    Conditional Simulation Using Diffusion Schrödinger Bridges
    Yuyang Shi, Valentin De Bortoli, George Deligiannidis, Arnaud Doucet
  9. Preprint·2022
    Riemannian Diffusion Schrödinger Bridge
    James Thornton, Michael Hutchinson, Emile Mathieu, Valentin De Bortoli, Yee Whye Teh, Arnaud Doucet
  10. Preprint·2022
    Spectral Diffusion Processes
    Angus Phillips, Thomas Seror, Michael Hutchinson, Valentin De Bortoli, Arnaud Doucet, Emile Mathieu
  11. JMIV·2022
    On Maximum a Posteriori Estimation with Plug & Play Priors and Stochastic Gradient Descent
    Rémi Laumont, Valentin De Bortoli, Andrés Almansa, Julie Delon, Alain Durmus, Marcelo Pereyra
  12. Preprint·2022
    An Introduction to Bayesian Imaging with Data-Driven Priors Encoded by Neural Networks
    Valentin De Bortoli, Julie Delon, Andrés Almansa, Alain Durmus, Marcelo Pereyra

2021

  1. NeurIPS·2021
    Diffusion Schrödinger Bridge with Applications to Score-Based Generative Modeling
    Valentin De Bortoli, James Thornton, Jeremy Heng, Arnaud Doucet

    Casts generative modelling as a Schrodinger bridge - an entropic optimal transport problem - and solves it by iterative proportional fitting on learned scores.

  2. JMLR·2021
    On Quantitative Laplace-Type Convergence Results for Some Exponential Probability Measures, with Two Applications
    Valentin De Bortoli, Agnès Desolneux
  3. Biometrika·2021
    Simulating Diffusion Bridges with Score Matching
    Valentin De Bortoli, Arnaud Doucet, Jeremy Heng, James Thornton
  4. AAP·2021
    Quantitative Uniform Stability of the Iterative Proportional Fitting Procedure
    George Deligiannidis, Valentin De Bortoli, Arnaud Doucet
  5. SIIMS·2021
    Bayesian Imaging Using Plug & Play Priors: When Langevin Meets Tweedie
    Rémi Laumont, Valentin De Bortoli, Andrés Almansa, Julie Delon, Alain Durmus, Marcelo Pereyra
  6. SIMODS·2021
    Maximum Entropy Methods for Texture Synthesis: Theory and Practice
    Valentin De Bortoli, Agnès Desolneux, Alain Durmus, Bruno Galerne, Arthur Leclaire
  7. COLT·2021
    Continuous and Discrete-Time Analysis of Stochastic Gradient Descent for Convex and Non-Convex Functions
    Xavier Fontaine, Valentin De Bortoli, Alain Durmus

2020

  1. NeurIPS·2020
    Quantitative Propagation of Chaos for SGD in Wide Neural Networks
    Valentin De Bortoli, Alain Durmus, Xavier Fontaine, Umut Simsekli
  2. ICASSP·2020·Best Student Paper Award
    Approximate Bayesian Computation with the Sliced-Wasserstein Distance
    Kimia Nadjahi, Valentin De Bortoli, Alain Durmus, Roland Badeau, Umut Simsekli
  3. SIIMS·2020
    Maximum Likelihood Estimation of Regularisation Parameters in High-Dimensional Inverse Problems: An Empirical Bayesian Approach. Part I: Methodology and Experiments
    Ana F. Vidal, Valentin De Bortoli, Marcelo Pereyra, Alain Durmus
  4. SIIMS·2020
    Maximum Likelihood Estimation of Regularisation Parameters in High-Dimensional Inverse Problems: An Empirical Bayesian Approach. Part II: Theoretical Analysis
    Valentin De Bortoli, Alain Durmus, Marcelo Pereyra, Ana F. Vidal
  5. ESAIM·2020
    Redundancy in Gaussian Random Fields
    Valentin De Bortoli, Agnès Desolneux, Bruno Galerne, Arthur Leclaire
  6. Preprint·2020
    Efficient Stochastic Optimisation by Unadjusted Langevin Monte Carlo. Application to Maximum Marginal Likelihood and Empirical Bayesian Estimation
    Valentin De Bortoli, Alain Durmus, Marcelo Pereyra, Ana F. Vidal
  7. PhD·2020
    Non-Local Statistics in Images: Modelling, Estimation and Sampling
    Valentin De Bortoli

2019

  1. SIIMS·2019
    Patch Redundancy in Images: A Statistical Testing Framework and Some Applications
    Valentin De Bortoli, Agnès Desolneux, Bruno Galerne, Arthur Leclaire
  2. SSVM·2019
    Macrocanonical Models for Texture Synthesis
    Valentin De Bortoli, Agnès Desolneux, Bruno Galerne, Arthur Leclaire
  3. Preprint·2019
    Convergence of Diffusions and Their Discretizations: From Continuous to Discrete Processes and Back
    Valentin De Bortoli, Alain Durmus

2018

  1. IET·2018
    Review of Wavelet-Based Unsupervised Texture Segmentation, Advantage of Adaptive Wavelets
    Yuan Huang, Valentin De Bortoli, Fan Zhou, Jérôme Gilles