Nathalie PEYRARD

Events

Colloque   PMSMA sur les Processus Markoviens et semi-Markoviens et leurs Applications. Montpellier, 5-7 juin 2023

Professional situation

DR2, MathNum division at INRAE.

INRAE Toulouse,  Unité de Mathématique et Informatique Appliquées de Toulouse

Chemin de Borde-Rouge BP 52627 - 31326 CASTANET-TOLOSAN cedex FRANCE

Ph: +33(0)5.61.28.54.39

Mail: nathalie.peyrard(-at-)inrae.fr

Publications

[list available here]

Research

I work in the field of Computational Statistics. I develop frameworks and algorithms for inference and management in graphical models, with applications in epidemiology, agronomy and ecology.

Key-words

• graphical models : Markov random field, DBN, H(S)MM, contact process on graph, factored Markov decision process (MDP).
• Approximate inference, estimation
• Variational methods
• network inference
• Application to ecological networks, meapopulation and metacommunity dynamics

PhD students

• Hanna Bacave (2021 - 2024). "Nouveaux modèles de Semi Markov cachés multi-chaînes pour les dynamiques de métapopulation avec population partiellement observable". co-advised with Pierre-Olivier Cheptou (CEFE-CNRS-Montpellier) and Nikolas Limnios (UTC).
• Anwar Abouabdallah (2019- 2022). "Apprentissage statistique pour l'identification d'OTUs et la caractérisation de la biodiversité". co-advised with Alain Franc (BioGeCo - INRA bordeaux) and Olivier Coulaud (INRIA Bordeaux).
• Etienne Auclair (2015-2018). "Methods for ecological network inference and management". co-advised with Régis Sabbadin (MIAT-INRA-Toulouse).
• Sebastian Le Coz (2015-2018). "A hidden Markov model for weed species dynamics in an agricultural landscape". co-advised with Pierre-Olivier Cheptou (CEFE-CNRS-Montpellier).
• Julia Radoszycki (2012-2015). "Methods for optimization-based design of management strategies of spatio-temporal processes: application ti the management of weed species". co-advised with R. Sabbadin and S. Gaba
• Mathieu Bonneau (2009-2012). "Adaptive spatial sampling for reconstruction of weeds maps", co-advised with R. Sabbadin and S. Gaba

Projects

• ANR project HSMM-INCA. HSMM: Inférence, Contrôle et Applications (01/2022-12/2025) (coordinatrice)
• ANR project AgroBiose. Biodiversité et services écosystémiques en agro-écosystèmes céréaliers intensifs (2014-2018)
• EcoPhyto 2018 project VESPA. Valeur et optimisation des dispositifs dépidémiosurveillance dans une stratégie durable de protection des cultures (2013-2016)
• MANAE. Managing Network in AgroEcology, joint INRA-CSIRO-University of Queensland projet (2013-2017)

•   AIGM (ex MSTGA) network: Algorithmic Issues for Inference in Graphical Models (2006 -2019; funded by INRA MIA and RNSC/ISC Paris). This network gathers researchers from different disciplines (Statistics, Statistical Mechanics, Probability, Artificial Intellicence, Theoretical Epidemiology, Image Analysis)

Softwares

• SEMMS: Spatial EM for Markovian Segmentation
• GMDP Toolbox : tools for approximate resolution of graph-based Markov decision processes