Metra #Metra number 180 pushing its set of #BiLevel coaches thru the Oak Park ave crossing and into the Berwyn station on the #BNSF west line in #Berwyn Il 3 2023
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Hashtag
#BiLevel
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The #ICBO2026 abstract submission deadline is coming soon:
bileveloptimization.org/icbo/2026/in...
I hope we meet later this year in Pittsburgh!
#orms #conference #bilevel #optimization
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Chapter 6 of the upcoming book on #bilevel #optimization:
General properties of mixed-integer linear bilevel problems.
Classic relaxations, infeasibility via lower-level unboundedness and how to test this up-front, existence of solutions, the refinement problem, complexity, reformulations, ...
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#Metra #205 pushing a set of #bilevel coaches inbound from #Aurora at the #Fairview Ave Station in #DownersGrove IL on the #BNSF west line in 2016 . This engine was destroyed a few months latter when it rolled down an embankment after the #CSX derailed it when transporting it to be rebuilt
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#Bilevel book proof-reading update.
Chapter 3: Single-level reformulations for convex lower-level problems ...
A few keywords: Optimal-value function, KKT, strong-duality, big-M, McCormick, IIC, local vs. global solutions, SOS1 conditions, ...
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Extended Deadline for #ICBO 2025, the
International Conference on Bilevel Optimization in Pittsburgh, US.
bileveloptimization.org/icbo/2026/in...
Register now and let's meet in August!
#orms #bilevel #optimization #conference
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PAPER NEWS!
Our paper "Learning the Follower's Objective Function in Sequential #Bilevel Games" (jointly w I. Molan & J. Thürauf) is now published in Mathematical Methods of Operations Research.
Interested? Go for it: link.springer.com/article/10.1.... It's #OpenAccess.
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Proof-reading chapter 2: Optimistic vs pessimistic #bilevel problems.
What is a pessimistic problem? Why is it different? And why is it actually not as different as many people thought for a long time …
#orms #optimization
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... a bit about the history of #bilevel #optimization and the main formal definitions:
the optimistic problem, coupling constraints, the rational reaction set, the optimal-value function, linking variables, local and global solutions, the single-level relaxation, etc.
Stay tuned for me!
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Proof-reading our #bilevel #optimization book.
Today: Chapter 1 about what it is all about 😉
From the content: many formal and informal examples such as pricing, toll setting, energy markets, critical infrastructure defense, interdiction problems (max-flow & knapsack)
... plus ...
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#Waldolf visiting the #Homewood @Metra #Metra station with a "new" #Metra #Electric #ME #bilevel #train departing the station behind him #firsuit #fursuiter #fursuiting #bear #costume
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A new book is coming:
"Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms"
by Ivana Ljubić, @yasminebeck.bsky.social, and myself.
Let's start the last round of proof-reading! Stay tuned for regular updates on its content.
#orms #bilevel #optimization #algorithms #textbook
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Yet another paper alert: Our paper "Mixed-Integer #Bilevel Optimization with Nonconvex Quadratic Lower-Level Problems: #Complexity and a Solution Method" (jointly with Immanuel Bomze and Andreas Horländer) is published in the Journal of Global #Optimization.
link.springer.com/article/10.1...
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#Waldolf with a #Mertra #bilevel Control cab coach at the #Aurora Transportation Center in #Aurora #Illinois #fursuit #fursuiter #fursuiting #bear #costume
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Hey #bilevel #optimization folks!
There is a completely revised and significantly extended version of our preprint on "Using Disjunctive Cuts in a Branch-and-Cut Method to Solve Convex Integer Nonlinear Bilevel Problems" (jointly w I. Ljubic & A. Horländer) online:
optimization-online.org?p=25955!
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Fantastic. The #bilevel #optimization society (BOS) has a great new website ...
bileveloptimization.org
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@Metra #Metra number 180 pushing its set of #BiLevel coaches thru the Oak Park ave crossing and into the Berwyn station on the #BNSF west line in #Berwyn Il 3 2023
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Where it started vs. how it’s going…
After ~2.5 years, it’s finally done: Our #orms paper on heuristics for Γ-robust #bilevel problems (with Ivana Ljubić and @schmaidt.bsky.social) is published online in @informs.bsky.social Journal on Computing! Here it is: pubsonline.informs.org/doi/10.1287/...
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#Metra #205 pushing a set of #bilevel coaches inbound from #Aurora at the #Fairview Ave Station in #DownersGrove IL on the #BNSF west line in 2016 . This engine was destroyed a few months latter when it rolled down an embankment after the #CSX derailed it when transporting it to be rebuilt
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It's done!
Our paper "Relax and penalize: a new #bilevel approach to mixed-binary hyperparameter #optimization" has been published in the Transactions on Machine Learning Research: jmlr.org/tmlr/papers/.
It's #OpenAccess; go for it!
Thanks to all the Italians 🇮🇹 for having me 👍
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Can #bilevel #optimization help to solve challenging #robust optimization problems?
Maybe … here’s our first numerical study on this topic:
"Solving Decision-Dependent Robust Problems as Bilevel Optimization Problems"
Jointly with H. Lefebvre, S. Stevens, and J. Thürauf.
tinyurl.com/3nxmjt74
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#Waldolf visiting the #Homewood @Metra #Metra station with a "new" #Metra #Electric #ME #bilevel #train departing the station behind him #firsuit #fursuiter #fursuiting #bear #costume
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Finally, our paper "Relax & penalize: a new #bilevel approach to mixed-binary hyperparameter #optimization" has now been accepted for publication in Transactions on Machine Learning Research.
Here's the preprint: arxiv.org/abs/2308.10711!
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📣 Paper news: Our #orms paper on heuristics for Gamma-robust #bilevel problems (jointly with Ivana Ljubić and @schmaidt.bsky.social) has been accepted for publication in INFORMS Journal on Computing @informs.bsky.social. You can find the details here: optimization-online.org?p=26186
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Our paper "Connections between #Robust and #Bilevel #Optimization" (jointly with Marc Goerigk, Johannes Thürauf und @jannisku.bsky.social) has now been published in OJMO.
It's #openaccess - you can find it here: ojmo.centre-mersenne.org/articles/OJM....
@unitrier.bsky.social
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So many young people solving #bilevel #optimization problems 😘
Greetings from the #NetOpt2025 winter school in Estoril, Portugal 🇵🇹
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Bizness at the front, dealing with Tariffs and shiz ‘n’ MAGA at the back!
#TowelDispenser
#BiLevel
#ApeDrape
#PharoahsHat
#HockeyHair
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Just Started...😁#Sims4builds #TS4 #Modern #EACreatorNetwork #bilevel #sims #Showusyourbuilds #nocc #basegame
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On the Gallery Now...😊#Sims4builds #TS4 #Modern #EACreatorNetwork #bilevel #sims #Showusyourbuilds #nocc #basegame
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