Held at Université de Lille, CRIStAL labs (France)
Session: Morning
09:00 - 09:45 T. Carneiro. Updated Version of the ChOp Distributed "Infrastructure"
09:45 - 10:30 J.-P. Valois. Massively Parallel Branch-and-Bound for Optimal Qubit Mapping in NISQ Systems
10:30 - 11:00 Coffee Break
11:00 - 11:45 J. Rouzé. GRASP-Inspired Algorithm for Qubit Mapping
11:45 - 12:30 M. Mezmaz. COLM: Towards a Framework for Combinatorial Optimisation Using Language Models
12:30 - 13:30 Lunch Break
13:30 - 14:00 All members. Closing remarks
Held at Université de Lille, CRIStAL labs (France)
Session 1: Thursday, March 20th, afternoon
12:00 - 13:30 Welcome Lunch & Opening
13:30 - 14:00 N. Melab and G. Danoy. UltraBO: Two-Year Review
14:00 - 14:45 J. Rouzé. Qubit Mapping Problem Tackled Using Parallel Metaheuristics
14:45 - 15:30 T. Carneiro. Investigating Portability in Chapel for Tree-Based Optimization on GPU-Powered Clusters
15:30 - 16:00 Coffee Break
16:00 - 17:00 I. Tagliaferro. Distributed Parallel Branch-and-Bound based on an MPI+X Approach
17:00 - 18:00 G. Helbecque. Enhancing Parallel Branch-and-Bound with Adaptive Mechanisms and Fault Tolerance
18:00 - 18:30 Visit of the Learning Center
Session 2: Friday, March 21th, morning
09:00 – 10:00 A. Vorokhta. Generating Lower-Bound Computation Strategies in a Branch and Bound Algorithm: Application to the Permutation Flowshop Scheduling Problem
10:00 – 10:30 G. Maudet. Search Strategy Generation for Branch and Bound Using Genetic Programming
10:30 – 10:45 Coffee Break
10:45 – 11:15 G. Maudet. A Distance Metric for Mixed Integer Programming Instances
11:15 – 11:30 All members. Closing and Future Actions
11:30 – 12:15 Visit of the regional Data Center, guided by J. Gmys
12:30 – 14:30 Lunch at "La Table" Restaurant
Held at Université du Luxembourg, SnT labs (Luxembourg)
Session 1: Morning
09:30 - 09:45 Welcome Coffee & Opening
09:45 - 11:00 N. Melab and G. Danoy. UltraBO: One-Year Review
11:00 - 11:15 Coffee Break
11:15 - 12:00 T. Carneiro. Ultra-Scale Tree-Based Optimization using PGAS/Chapel
12:00 - 14:00 Lunch at "Schmelz" Restaurant
Session 2: Afternoon
14:00 - 14:45 G. Helbecque and I. Tagliaferro. Parallel Distributed B&B on Large GPU-Powered Clusters
14:45 - 15:30 G. Maudet and A. Vorokhta. Alternatives to B&B and its Hybridization with Metaheuristics
15:30 - 16:00 Permanent members. Future Actions & Perspectives
June 12 3rd UltraBO Workshop held at CRIStAL labs, Université de Lille, France.
June 3 Tiago Carneiro joins the project as Post-Doctoral Researcher.
May 25 Joint organization of 16th IEEE Workshop on Parallel / Distributed Combinatorics and Optimization (PDCO 2026), New Orleans, USA.
Apr. 28-30 Joint organization of the Intl. Conf. on Optimization and Learning (OLA'2026), Chania, Greece.
Apr. 24 Invited seminar at University of Bordeaux: G. Helbecque. "PGAS-based Parallel Branch-and-Bound Algorithms for Ultra-Scale Supercomputers".
Dec. 11 Invited seminar for M2 "scientific computing" at ULille: J.-P. Valois and G. Helbecque. "Massively Parallel Exact Optimization for Qubit Allocation Quantum Systems".
Oct. 15 Mohand Mezmaz joins the project as Post-Doctoral Researcher.
Oct. 1 Jean-Philippe Valois moves into the position of Doctoral Researcher.
Jul. 30 Interview for Chapel Blog (HPE Cray), "7 Questions for Tiago Carneiro and Guillaume Helbecque: Combinatorial Optimization in Chapel". [link]
June 3 Joint organization of 15th IEEE Workshop on Parallel / Distributed Combinatorics and Optimization (PDCO 2025), Milan, Italy.
May 2 Paul Tournaire joins the project as Master 2 Intern.
Apr. 23-25 Joint organization of the Intl. Conf. on Optimization and Learning (OLA'2025), Dubai, United Arab Emirates.
Apr. 15 Mathis Da Cunha joins the project as Master 2 Intern.
Apr. 15 Baka-Junior Cedric Blé joins the project as Master 2 Intern.
Mar. 20-21 2nd UltraBO Workshop held at CRIStAL labs, Université de Lille, France.
Mar. 1 Jean-Philippe Valois joins the project as Master 2 Intern.
Jan. 15 Guillaume Helbecque moves into the position of Post-Doctoral Researcher.
Oct. 1 Ivan Tagliaferro moves into the position of Doctoral Researcher.
May 31 Joint organization of 14th IEEE Workshop on Parallel / Distributed Combinatorics and Optimization (PDCO 2024), San Francisco, USA.
May 13-15 Joint organization of the Intl. Conf. on Optimization and Learning (OLA'2024), Dubrovnik, Croatia.
Apr. 4 1st UltraBO Workshop held at SnT labs, Université du Luxembourg, Luxembourg.
Mar. 1 Ivan Tagliaferro joins the project as Master 2 Intern.
Mar. 1 Invited seminar at University of Malaga: N. Melab, T. Carneiro and G. Helbecque. "Ultra-scale Tree-based Optimization".
Dec. 1 Alisa Vorokhta joins the project as Doctoral Researcher.
Dec. 1 Gwen Maudet joins the project as Post-Doctoral Researcher.
Nov. 30 Invited seminar for M2 "scientific computing" at ULille: T. Carneiro and G. Helbecque. "Chapel-based Ultra-scale Exact Optimization".
Jul. 24 Upload of the Data Management Plan on the ANR site.
Jul. 18 Creation of the web site of UltraBO.
May 19 Joint organization of 13th IEEE Workshop on Parallel / Distributed Combinatorics and Optimization (PDCO 2023), St Petersburg, USA.
May 9 Attendance of the workshop on Data Management Plan at University of Lille.
May 3-5 Joint organization of the Intl. Conf. on Optimization and Learning (OLA'2023), Malaga, Spain.
May 4 Kick-off of UltraBO.
Apr. 11 Attendance of the workshop on OpenAcess at University of Lille.
Mar. 1 Starting of UltraBO.
Dec. 13 Project kick-off meeting of ANR selected projects [slides].