Tootfinder

Asymmetric Perturbation in Solving Bilinear Saddle-Point Optimization
Kenshi Abe, Mitsuki Sakamoto, Kaito Ariu, Atsushi Iwasaki
https://arxiv.org/abs/2506.05747

Asymmetric Perturbation in Solving Bilinear Saddle-Point Optimization
This paper proposes an asymmetric perturbation technique for solving saddle-point optimization problems, commonly arising in min-max problems, game theory, and constrained optimization. Perturbing payoffs or values are known to be effective in stabilizing learning dynamics and finding an exact solution or equilibrium. However, it requires careful adjustment of the perturbation magnitude; otherwise, learning dynamics converge to only an equilibrium. We establish an impossibility result that it a…

The latest salvo in Trump's fight to remake America’s elite cultural institutions:
This time, the attack has foundered!
So far, Sajet, a 60-year-old Dutch art historian with a long career in American and Australian art museums who became the National Portrait Gallery’s first female director in 2013, is still at her desk.
Trump lacks the legal authority to dismiss Sajet or hire her replacement
—although you can bet that administration lawyers are looking for legal …

Why Is Trump Trying to Fire This Museum Director?
If he succeeds, it could put the whole Smithsonian under his thumb.

Amid Trump standoff, Smithsonian says only secretary can hire and fire (Washington Post)
https://www.washingtonpost.com/entertainment/art/2025/06/09/smithsonian-kim-sajet-national-portrait-gallery/?pwapi_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyZWFzb24iOiJnaWZ0IiwibmJmIjoxNzQ5NDQxNjAwLCJpc3MiOiJzdWJzY3JpcHRpb25zIiwiZXhwIjoxNzUwODIzOTk5LCJpYXQiOjE3NDk0NDE2MDAsImp0aSI6IjVhNDIzODA0LTJiM2QtNDQ1Zi05OTBmLWQ2M2UzNjU0OTRkMyIsInVybCI6Imh0dHBzOi8vd3d3Lndhc2hpbmd0b25wb3N0LmNvbS9lbnRlcnRhaW5tZW50L2FydC8yMDI1LzA2LzA5L3NtaXRoc29uaWFuLWtpbS1zYWpldC1uYXRpb25hbC1wb3J0cmFpdC1nYWxsZXJ5LyJ9.uA0SWk04Q-JQCni1RKRrJQGJCMSdTlg2snSd82VO2C4&itid=gfta
http://www.memeorandum.com/250610/p11#a250610p11

Using random perturbations to infer the structure of feedback control in gene expression
Seshu Iyengar, Andreas Hilfinger
https://arxiv.org/abs/2505.04912 …

Using random perturbations to infer the structure of feedback control in gene expression
Feedback in cellular processes is typically inferred through cellular responses to experimental perturbations. Modular response analysis provides a theoretical framework for translating specific perturbations into feedback sensitivities between cellular modules. However, in large-scale drug perturbation studies the effect of any given drug may not be known and may not only affect one module at a time. Here, we analyze the response of gene expression models to random perturbations that affect mu…

Addressing geometrical perturbations by applying generalized polynomial chaos to virtual density in continuous energy Monte-Carlo power iteration
Th\'eophile Bonnet, Anuj Dubey, Eugene Shwageraus
https://arxiv.org/abs/2506.06046

Addressing geometrical perturbations by applying generalized polynomial chaos to virtual density in continuous energy Monte-Carlo power iteration
In this work, we revisit the use of the virtual density method to model uniform geometrical perturbations. We propose a general algorithm using surface tracking in order to estimate explicitly the effect of geometrical perturbations in continuous-energy Monte Carlo simulations, and we apply the intrinsic generalized polynomial chaos method in order to estimate the coefficients of a reduced model giving the multiplication factor as a function of the amplitude of the geometrical perturbation. Our…

Orbital Stability of Plane Waves in the Klein-Gordon Equation against Localized Perturbations
Emile Bukieda, Louis Gar\'enaux, Bj\"orn de Rijk
https://arxiv.org/abs/2506.06029

Orbital Stability of Plane Waves in the Klein-Gordon Equation against Localized Perturbations
We investigate the stability and long-term behavior of spatially periodic plane waves in the complex Klein-Gordon equation under localized perturbations. Such perturbations render the wave neither localized nor periodic, placing its stability analysis outside the scope of the classical orbital stability theory for Hamiltonian systems developed by Grillakis, Shatah, and Strauss. Inspired by Zhidkov's work on the stability of time-periodic, spatially homogeneous states in the nonlinear Schröding…

"[…] Let's take a look at 6 improvements to look forward to in the upcoming #GCC 15.
1. Prettier execution paths
2. A new look for C template errors
3. Machine-readable diagnostics
4. An easier transition to C23
5. A revamped color scheme
6. libgdiagnostics
We're still fixing bugs, but we hope that GCC 15 will be ready to officially release (as …

6 usability improvements in GCC 15 | Red Hat Developer
GCC 15 brings better error messages and diagnostics for your code, including prettier execution paths and easier-to-read compiler errors for C++ templates

Dynamic Mixture of Progressive Parameter-Efficient Expert Library for Lifelong Robot Learning
Yuheng Lei, Sitong Mao, Shunbo Zhou, Hongyuan Zhang, Xuelong Li, Ping Luo
https://arxiv.org/abs/2506.05985

Dynamic Mixture of Progressive Parameter-Efficient Expert Library for Lifelong Robot Learning
A generalist agent must continuously learn and adapt throughout its lifetime, achieving efficient forward transfer while minimizing catastrophic forgetting. Previous work within the dominant pretrain-then-finetune paradigm has explored parameter-efficient fine-tuning for single-task adaptation, effectively steering a frozen pretrained model with a small number of parameters. However, in the context of lifelong learning, these methods rely on the impractical assumption of a test-time task identi…

Approximation of the Pseudospectral Abscissa via Eigenvalue Perturbation Theory
Waqar Ahmed, Emre Mengi
https://arxiv.org/abs/2506.05535 https://

Approximation of the Pseudospectral Abscissa via Eigenvalue Perturbation Theory
Reliable and efficient computation of the pseudospectral abscissa in the large-scale setting is still not settled. Unlike the small-scale setting where there are globally convergent criss-cross algorithms, all algorithms in the large-scale setting proposed to date are at best locally convergent. We first describe how eigenvalue perturbation theory can be put in use to estimate the globally rightmost point in the $ε$-pseudospectrum if $ε$ is small. Our treatment addresses both general nonlinea…

Amid Trump standoff, Smithsonian says only secretary can hire and fire
The Smithsonian’s Board of Regents said on Monday night that
“all personnel decisions” are directed by Secretary Lonnie G. Bunch III,
10 days after Donald Trump claimed that he had fired the director of the institution’s National Portrait Gallery.
The board, which issued its statement after an all-day meeting Monday, also said that it supported Bunch’s “authority and management” of the Smithsonian…

Amid Trump standoff, Smithsonian says only secretary can hire and fire
The Board of Regents publicly backed Smithsonian leader Lonnie G. Bunch III and called for nonpartisanship after Trump attempted to fire a museum director.