[Post to be continued later, I'm just marking space]
I developed the Kebab principle in Strasbourg (Alsace, France), lunching excellent kebabs (with Rotekohl) in Pamukalle II.
I elaborated on the Digital Mafia in another and more gourmet Kebab restaurant in Paris: rue du Paradis, in one Our Kebab franchise (Grand Paris, France).
Kultur Pop ? Il s'agit de compilations de génériques musicaux d'émissions de radio (surtout culturelles, France Culture/France Inter, et parfois des intruses), émissions et musiques qui m'ont influencées.
Le 49e volume de génériques radiophoniques Kultur Pop, vient donc de paraître. Il est nommé "Syzygy". Cela faisait plusieurs confinements depuis le numéro 48, et tous les précédents disponibles sur "La vertu d'un LA : Kultur Pop". Coïncidence, il contient un morceau du EP de Saycet : "One Day At Home".
Kultur Pop 49 "Syzygy" se place sous le signe de la science, dans une conjonction (syzygy ou syzygie). Celle du décès de Michel Alberganti (producteur de radio, journaliste et écrivain) qui anima notamment la passionnante émission "Science-Friction" sur France Culture. Et celle du prix AJSPI (Association des journalistes scientifiques de la presse d’information) du meilleur journaliste scientifique de l'année 2021 décerné au journaliste scientifique Nicolas Martin (avec notamment : Radiographie du coronavirus, Les idées Claires, La Méthode Scientifique).
Tandis :
que le rayon de la pandémie s’accroît,
que le volume de la crédibilité dite scientifique se dissipe dans les vapeurs vaccinales,
que toute attestation atteste de la fragilité attestant les propos ci-dessus,
nous écouterons :
Kultur Pop #49-01 Juke-Box (ex-Métronomique), France Culture : David Axelrod, Holy Thursday
Kultur Pop #49-02 Science Friction, fin, France Culture : Readymade FC (Jean-Philippe verdin) Interlude 01
Kultur Pop #49-04 Heureux qui comme Ulysse (France Inter) et La démarche scientifique, Le journal des sciences (France Culture) : Saycet, Chromatic bird
Kultur Pop #49-05 La méthode scientifique, fin (France Culture) : Nils Frahm, Says
Kultur Pop #49-06 Interlude jour, après Sur les docks (France Culture) : Jean-Yves Berenguer, Ellipse ([Mino]taure)
Kultur Pop #49-07 Science Friction, interlude (France Culture) : F. S. Blumm, Standuhrwerk
Kultur Pop #49-08 La méthode scientifique, La recherche montre en main (France Culture) : Little People, Start Shootin'
From ancient traditions, the hurricane turtle was the world. Since recent outcrops, Hurricane Turtle is the word. A band with no less than Pierre Cherbero (Chant / Orgue), Seb "iep" Arruti (Trombone), Sylvain Téjérizo (Saxophone), Julien Dubois (Basse), Olivier Léani (Batterie). No more.
[TL;DR] How I discovered sparsity and stopped worrying about it This is a journey into sparsity. The story started in 2009, in the South of France, and the nice island of Porquerolles. Here, clear blue water.
Amel Benazza-Benyahia, Jérôme Bolte, Antonin Chambolle, Caroline Chaux, Philippe Ciuciu, Albert Cohen, Patrick Louis Combettes, Claude Comtat, Christine de Mol, Alvaro R. De Pierro, Michel Defrise, Ron DeVore, Jalal Fadili, Mario Figueiredo, Massimo Fornasier, Jacques Froment, Yves Goussard, Gabor Herman, Jérome Idier, Dirk Lorenz, Russell Luke, Francois Malgouyres, Pierre Maréchal, Ali Mohammad-Djafari, Stanley Osher, Valérie Perrier, Jean-Christophe Pesquet, Gabriel Peyré, Aleksandra Pizurica, Andrew Reader, Elena Resmerita, Marc Sigelle, Gabriele Steidl, Marc Teboulle, Joel Trussell, Michael Unser, Dimitri Van de Ville, Isao Yamada
The program was wonderful. The trade-off between sea, science and sun was so easy. At that time, I had been working mostly with signals and images, processing them with sparsity-promoting decompositions: complex orthogonal/biorthogonal dual-tree wavelets with interesting covariance properties able at multichannel/multicomponent image denoising, tighly oversampled complex filter banks. We wanted to have data become sparser through a projection on some vector basis, union of bases or frames. Yet, what sparsity really meant was not fully clear to me. The count measure $\ell_0$ of course, but it is not practically usable for several reasons. [TO BE CONTINUED, THEN MATERIALS] So: SPOQ means, in Swedish, "Svenskt Pediatriskt Ortopediskt Qvalitetsregister" (Swedish Pediatric Orthopaedic Quality register).
L0 sparsity count index, L1-norm non-smooth convex proxy, L1/L2-norm ratio and Lp/Lq quasinorm/norm ratio smooth non-convex penalties.
Abstract: Underdetermined or ill-posed inverse problems require additional information for sound solutions with tractable optimization algorithms. Sparsity yields consequent heuristics to that matter, with numerous applications in signal restoration, image recovery, or machine learning. Since the
ℓ0
count measure is barely tractable, many statistical or learning approaches have invested in computable proxies, such as the ℓ1
norm. However, the latter does not exhibit the desirable property of scale invariance for sparse data. Generalizing the SOOT Euclidean/Taxicab ℓ1
/
ℓ2
norm-ratio initially introduced for blind deconvolution, we propose SPOQ, a family of smoothed scale-invariant penalty functions. It consists of a Lipschitz-differentiable surrogate for ℓp
-over-ℓ
q
quasi-norm/norm ratios with p∈]0,2[
and q≥2
. This surrogate is embedded into a novel majorize-minimize trust-region approach, generalizing the variable metric forward-backward algorithm. For naturally sparse mass-spectrometry signals, we show that SPOQ significantly outperforms ℓ0
, ℓ1
, Cauchy, Welsch, and \celo penalties on several performance measures. Guidelines on SPOQ hyperparameters tuning are also provided, suggesting simple data-driven choices.