Annonce

annonce@lrde.epita.fr

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Publication: Trends in Functional Programming

by Jim Newton (lrde)

Hi Everyone, We are pleased to announce that we have a paper accepted for presentation at the 2020 Trends in Functional Programming Symposium (http://www.cse.chalmers.se/~rjmh/tfp/). The corresponding paper is available reading at https://www.lrde.epita.fr/dload/papers/newton.20.tfp.pdf The article is entitled: Performance Comparison of Several Folding Strategies Abstract: In this article we examine the computation order and consequent performance of three different conceptual implementations of the fold function. We explore a set of performance based experiments on different implementations of this function. In particular, we contrast the fold-left implementation with two other implements we refer to as pair-wise-fold and tree-like-fold. We explore two application areas: ratio arithmetic and Binary Decisions Diagram construction. We demonstrate several cases where the performance of certain algorithms is very different depending on the approach taken. In particular iterative computations where the object size accumulates are good candidates for the tree-like-fold. I hope you enjoy reading the paper, and I’m happy to have anyone’s feedback. Kind regards Jim NEWTON

4 years, 11 months

[Seminaire-LRDE] Mardi 17 décembre 2019: Yongchao Xu, Associate Professor at the School of Electronic Information and Communications, HUST, China

by Nicolas BOUTRY

Chers collègues, La prochaine session du séminaire Performance et Généricité du LRDE (Laboratoire de Recherche et Développement de l'EPITA) aura lieu le Mardi 17 décembre 2019 (10h -- 11h), IP12A. Vous trouverez sur le site du séminaire [1] les prochaines séances, les résumés, captations vidéos et planches des exposés précédents [2], le détail de cette séance [3] ainsi que le plan d'accès [4]. [1] http://seminaire.lrde.epita.fr <http://seminaire.lrde.epita.fr/> [2] http://seminaire.lrde.epita.fr/Archives <http://seminaire.lrde.epita.fr/Archives> [3] http://seminaire.lrde.epita.fr/2019-12-17 <http://seminaire.lrde.epita.fr/2019-12-17> [4] http://www.lrde.epita.fr/wiki/Contact <http://www.lrde.epita.fr/wiki/Contact> Au programme du Mardi 17 décembre 2019 : * 10h -- 11h: Learning the relationship between neighboring pixels for some vision tasks -- Yongchao Xu, Associate Professor at the School of Electronic Information and Communications, HUST, China http://www.vlrlab.net/~yxu/ <http://www.vlrlab.net/~yxu/> The relationship between neighboring pixels plays an important role in many vision applications. A typical example of a relationship between neighboring pixels is the intensity order, which gives rise to some morphological tree-based image representations (e.g., Min/Max tree and tree of shapes). These trees have been shown useful for many applications, ranging from image filtering to object detection and segmentation. Yet, these intensity order based trees do not always perform well for analyzing complex natural images. The success of deep learning in many vision tasks motivates us to resort to convolutional neural networks (CNNs) for learning such a relationship instead of relying on the simple intensity order. As a starting point, we propose the flux or direction field representation that encodes the relationship between neighboring pixels. We then leverage CNNs to learn such a representation and develop some customized post-processings for several vision tasks, such as symmetry detection, scene text detection, generic image segmentation, and crowd counting by localization. This talk is based on [1] and [2], as well as extension of those previous works that are currently under review. [1] Xu, Y., Wang, Y., Zhou, W., Wang, Y., Yang, Z. and Bai, X., 2019. Textfield: Learning a deep direction field for irregular scene text detection. IEEE Transactions on Image Processing. [2] Wang, Y., Xu, Y., Tsogkas, S., Bai, X., Dickinson, S. and Siddiqi, K., 2019. DeepFlux for Skeletons in the Wild. In Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition. -- Yongchao Xu received in 2010 both the engineer degree in electronics & embedded systems at Polytech Paris Sud and the master degree in signal processing & image processing at Université Paris Sud, and the Ph.D. degree in image processing and mathematical morphology at Université Paris Est in 2013. After completing his Ph.D. study at LRDE, EPITA, ESIEE Paris, and LIGM, He worked at LRDE as an assistant professor (Maître de Conférences). He is currently an Associate Professor at the School of Electronic Information and Communications, HUST. His research interests include mathematical morphology, image segmentation, medical image analysis, and deep learning. L'entrée du séminaire est libre. Merci de bien vouloir diffuser cette information le plus largement possible. N'hésitez pas à nous faire parvenir vos suggestions d'orateurs. -------------- section suivante -------------- Une pièce jointe HTML a été nettoyée... URL: <http://lists.lrde.epita.fr/pipermail/seminaire/attachments/20191211/c06b5da…> _______________________________________________ Seminaire mailing list Seminaire(a)lrde.epita.fr https://lists.lrde.epita.fr/listinfo/seminaire

5 years

Soutenance de thèse de Minh ON VU NGOC le 17 Décembre à l'EPITA

by movn

Bonjour à tous, J'ai le plaisir de vous inviter à la soutenance de ma thèse intitulée : "A new minimum barrier distance for multivariate images with applications to salient object detection, shortest path finding, and segmentation." L'exposé se déroulera en anglais. Vous êtes également cordialement invité au pot qui suivra. Date : le mardi 17 Décembre à 14h Lieu : en salle KB604 à l'EPITA, 14-16 rue Voltaire, Le Kremlin-Bicêtre 94270 Vous trouverez également toutes les informations sur la page web suivante : https://www.lrde.epita.fr/wiki/Affiche-these-MOVN Le jury sera composé de : Rapporteurs : * Nicole VINCENT, Pr., Université Paris Descartes, LIPADE * Jean-Christophe BURIE, Pr., Université La Rochelle, L3I Examinateurs : * Benoît NAEGEL, MdC, Université de Strasbourg, ICube * Béatriz MARCOTEGUI, Pr., Mines ParisTech, CMM Encadrants : * Thierry GÉRAUD, Pr., EPITA, LRDE * Jonathan FABRIZIO, MdC, EPITA, LRDE Mots clés : Arbre de formes, morphologie mathématique, représentation hiérarchique, images multivariées, pseudo-distance de Dahu, distance de barrière minimale, saillance visuelle, document détection, segmentation de l’image. Résumé de la thèse : Les représentations hiérarchiques d’images sont largement utilisées dans le traitement d’images pour modéliser le contenu d’une image par un arbre. Une hiérarchie bien connue est l’arbre des formes (AdF) qui encode la relation d’inclusion entre les composants connectés à partir de différents niveaux de seuil. Ce genre d’arbre est auto-dual et invariant au changement de contraste; il est utilisé dans de nombreuses applications de vision par ordinateur. En raison de ses propriétés, dans cette thèse, nous utilisons cette représentation pour calculer la nouvelle distance qui appartient au domaine de la morphologie mathématique. Les transformations de distance et les cartes de saillance qu’elles induisent sont généralement utilisées dans le traitement d’images, la vision par ordinateur et la reconnaissance de formes. L’une des transformations de distance les plus couramment utilisées est la géodésique. Malheureusement, cette distance n’obtient pas toujours des résultats satisfaisants sur des images bruitées ou floues. Récemment, une nouvelle pseudo-distance, appelée distance de barrière minimum (MBD), plus robuste aux variations de pixels, a été introduite. Quelques années plus tard, Géraud et al. ont proposé une bonne approximation rapide de cette distance : la pseudo-distance de Dahu. Puisque cette distance a été initialement développée pour les images en niveaux de gris, nous proposons ici une extension de cette transformation aux images multivariées ; nous l’appelons la pseudo-distance vectorielle de Dahu. Cette nouvelle distance est facilement calculée grâce à l’arbre multivarié des formes (AdFM). Nous vous proposons une méthode de calcul efficace de cette distance et de sa carte de saillants dans cette thèse. Nous étudions également les propriétés de cette distance dans le traitement d’images floutées ou bruitées. Pour valider cette nouvelle distance, nous fournissons des repères démontrant à quel point la pseudo-distance vectorielle de Dahu est plus robuste et compétitive par rapport aux autres distances basées sur la barrière minimum. Cette distance est prometteuse pour la détection des objets saillants, la recherche du chemin le plus court et la segmentation des objets. De plus, nous appliquons cette distance pour détecter des documents dans des vidéos. Notre méthode est une approche basée sur les régions qui s’appuie sur la saillance visuelle déduite de la pseudo-distance de Dahu. Nous montrons que la performance de notre méthode est compétitive par rapport aux méthodes de pointe utilisées dans le concours Smartdoc 2015 ICDAR. A bientôt, Minh ON VU NGOC

5 years

[CfP] ELS 2020, 13th European Lisp Symposium, April 27-28, Zurich

by Didier Verna

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 13th European Lisp Symposium Special Focus on Compilers Call for papers April 27 - April 28, 2020 GZ Riesbach Zürich, Switzerland http://www.european-lisp-symposium.org/2020 Sponsored by EPITA, Igalia S.L. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Invited Speakers ~~~~~~~~~~~~~~~~ Andrew W. Keep (Cisco Systems, Inc.), on the Nanopass Framework. Daniel Kochmański (Turtleware), on ECL, the Embeddable Common Lisp. Important Dates ~~~~~~~~~~~~~~~ - Submission deadline: February 13, 2020 - Author notification: March 16, 2020 - Final papers due: April 6, 2020 - Symposium: April 27 - 28, 2020 Scope ~~~~~ The purpose of the European Lisp Symposium is to provide a forum for the discussion and dissemination of all aspects of design, implementation and application of any of the Lisp dialects, including Common Lisp, Scheme, Emacs Lisp, Clojure, Racket, ACL2, AutoLisp, ISLISP, Dylan, ECMAScript, SKILL and so on. We encourage everyone interested in Lisp to participate. The European Lisp Symposium 2020 invites high quality papers about novel research results, insights and lessons learned from practical applications, and educational perspectives. We also encourage submissions about known ideas as long as they are presented in a new setting and/or in a highly elegant way. This year's focus will be directed towards "Compilers". We especially invite submissions in the following areas: - Compiler techniques - Compiler passes - Compiler compilers - Showcasing of industrial or experimental compilers - Code generation - Compiler verification - Compiler optimizations - JIT compilers Contributions are also welcome in other areas, including but not limited to: - Context-, aspect-, domain-oriented and generative programming - Macro-, reflective-, meta- and/or rule-based development approaches - Language design and implementation - Language integration, inter-operation and deployment - Development methodologies, support and environments - Educational approaches and perspectives - Experience reports and case studies Technical Program ~~~~~~~~~~~~~~~~~ We invite submissions in the following forms: * Papers: Technical papers of up to 15 pages that describe original results or explain known ideas in new and elegant ways. * Demonstrations: Abstracts of up to 4 pages for demonstrations of tools, libraries, and applications. * Tutorials: Abstracts of up to 4 pages for in-depth presentations about topics of special interest for at least 90 minutes and up to 180 minutes. All submissions should be formatted following the ACM SIGS guidelines and include ACM Computing Classification System 2012 concepts and terms. Submissions should be uploaded to Easy Chair, at the following http://www.easychair.org/conferences/?conf=els2020 Note: to help us with the review process please indicate the type of submission by entering either "paper", "demo", or "tutorial" in the Keywords field. Programme Chair ~~~~~~~~~~~~~~~ Ioanna M. Dimitriou H. - Igalia, Spain/Germany Local Chair ~~~~~~~~~~~ Nicolas Hafner - Shinmera, Switzerland Programme Committee ~~~~~~~~~~~~~~~~~~~ Andy Wingo - Igalia, Spain/France Asumu Takikawa - Igalia, Spain/USA Charlotte Herzeel - IMEC, Intel Exascience Lab, Belgium Christophe Rhodes - Google, UK Iréne Durand - Université Bordeaux 1, France Jim Newton - EPITA Research Lab, France Kent Pitman - HyperMeta, USA Leonie Dreschler-Fischer - University of Hamburg, Germany Marco Heisig - FAU Erlangen-Nürnberg, Germany Mark Evenson - not.org, Austria Max Rottenkolber - Interstellar Ventures, Germany Paulo Matos - Igalia, Spain/Germany Robert Goldman - SIFT, USA Robert Strandh - Université Bordeaux 1, France (more PC members to be announced) -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info

5 years

Quickref 3.0 "The Alchemist" is released

by Didier Verna

Following yesterday's release of Declt, I'm happy to announce the release of Quickref 3.0, our documentation aggregator for Quicklisp libraries. This release is synchronized with that of Declt and the latest Quicklisp distribution, resulting in 1792 reference manual for Common Lisp libraries. The official website has been updated yesterday: https://quickref.common-lisp.net/ -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info

5 years, 1 month

Declt 3.0 is released

by Didier Verna

I'm pleased to announce the release of Declt 3.0 "Montgomery Scott", my Texinfo reference manual generator for Common Lisp libraries. This is a new major release of the library, although the changes may not be so visible from the outside. The main concern in this release has been to increase the robustness of the output, from three different angles. 1. Many places from where Declt attempts to extract meaningful information are underspecified (ASDF system slots notably). 2. The pretty-printing of Lisp items can be difficult, given the liberalism and extensibility of the language. 3. Finally, several restrictions in the syntax of Texinfo itself (anchor names notably) get in the way. These issues were described in a paper presented at the TeX Users Group conference, this summer in Palo Alto. This release goes a long way toward fixing them. The new generated reference manuals look mostly the same as before, but some important things have changed under the hood, notably the names of hyperlinks and cross-references (backward-incompatible, hence the increase in the major version number). The output is now also much more robust with respect to the final output format: the generation of HTML, DVI, Postscript, PDF, and even plain Info should work fine and has been tested on all Quicklisp libraries (in fact, Quickref will also be upgraded in the near future to provide all those formats at once). Those improvements do come at a cost. Unicode is now required (even for Info readers). To be honest, many Lisp libraries already had that implicit requirement. Also, this release depends on improvements and bug fixes only available in Texinfo 6.7, now a requirement as well. I have to thank Gavin Smith, from the Texinfo team, for his collaboration. Apart from that, this release also has a number of bug fixes. - Some method specializers were not handled properly. - The manuals were missing documentation for some non-Lisp source files. - There were some glitches in the pretty-printing of unreadable objects. Declt's homepage: https://www.lrde.epita.fr/~didier/software/lisp/typesetting.php#declt -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info

5 years, 1 month

[Seminaire-LRDE] Mardi 1 octobre 2019: Edward A. Luke, Professor, Department of Computer Science and Engineering, Mississippi State University

by Edwin Carlinet

Chers collègues, La prochaine session du séminaire Performance et Généricité du LRDE (Laboratoire de Recherche et Développement de l'EPITA) aura lieu le Mardi 1 octobre 2019 (11h -- 12h), Amphi 4. Vous trouverez sur le site du séminaire [1] les prochaines séances, les résumés, captations vidéos et planches des exposés précédents [2], le détail de cette séance [3] ainsi que le plan d'accès [4]. [1] http://seminaire.lrde.epita.fr [2] http://seminaire.lrde.epita.fr/Archives [3] http://seminaire.lrde.epita.fr/2019-10-01 [4] http://www.lrde.epita.fr/wiki/Contact Au programme du Mardi 1 octobre 2019 : * 11h -- 12h: The Loci Auto-Parallelizing Framework: An Overview and Future Directions -- Edward A. Luke, Professor, Department of Computer Science and Engineering, Mississippi State University http://web.cse.msstate.edu/~luke/loci/index.html The Loci Auto-Parallelizing framework provides a Domain Specific Language (DSL) for the creation of high performance numerical models. The framework uses a logic-relation model to describe irregular computations, provide guarantees of internal logical consistency, and provides for automatic parallel execution. The framework has been used to develop a number of advance computational models used in production engineering processes. Currently Loci based tools form the backbone of computational fluid dynamics tools used by NASA Marshall and Loci based codes account for more than 20% of the computational workload on NASA’s Pleiades supercomputer. This talk will provide an overview of the framework, discuss its general approach, and provide comparisons to other programming models through a mini-app benchmark. In addition, future plans for developing efficient schedules of fine-grained parallel and memory bandwidth constrained computations will be discussed. Finally, some examples of the range of engineering simulations enabled by the technology will be introduced and briefly discussed. -- Dr. Ed Luke is a professor of computer science in the computer science department of Mississippi State University. He received his Ph.D. in the field of Computational Engineering in 1999 and conducts research at the intersection between applied math, computer science. His research focuses on creating systems to automatically parallelize numerical algorithms, particularly those used to solve systems of partial differential equations. Currently Dr. Luke is participating in active collaborations with INRIA in Paris conducting research in the areas of solver parallelization and mesh generation. L'entrée du séminaire est libre. Merci de bien vouloir diffuser cette information le plus largement possible. N'hésitez pas à nous faire parvenir vos suggestions d'orateurs. -- Edwin Carlinet Laboratoire R&D de l'EPITA (LRDE) _______________________________________________ Seminaire mailing list Seminaire(a)lrde.epita.fr https://lists.lrde.epita.fr/listinfo/seminaire

5 years, 2 months

New publication: ICFEM'19

by Renault Etienne

Greetings, We are please to announce that the following paper has been accepted in 21st International Conference on Formal Engineering Methods (ICFEM'19). Please find the title and abstract below. Title and corresponding authors: "Combining Parallel Emptiness Checks with Partial Order Reductions" Denis Poitrenaud (1,2) and Etienne Renault (3) (1) Sorbonne Université, CNRS, LIP6, F-75005 Paris, France (2) Université Paris Descartes, Paris, France (3) LRDE, Epita, Paris, France Abstract: In explicit state model checking of concurrent systems, multicore emptiness checks and partial order reductions (POR) are two major techniques to handle large state spaces. The first one tries to take advantage of multi-core architectures while the second one may decrease exponentially the size of the state space to explore. For checking LTL properties, Bloemen and van de Pol [2] shown that the best performance is currently obtained using their multi-core SCC-based emptiness check. However, combining the latest SCC-based algorithm with POR is not trivial since a condition on cycles, the proviso, must be enforced on an algorithm which processes collaboratively cycles. In this paper, we suggest a pessimistic approach to tackle this problem for liveness properties. For safety ones, we propose an algorithm which takes benefit from the information computed by the SCC-based algorithm. We also present new parallel provisos for both safety and liveness prop- erties that relies on other multi-core emptiness checks. We observe that all presented algorithms maintain good reductions and scalability. More information at : https://www.lrde.epita.fr/wiki/Publications/renault.18.vecos <https://www.lrde.epita.fr/wiki/Publications/renault.18.vecos>

5 years, 4 months

New publication: Generic Emptiness Check for Fun and Profit (ATVA'19)

by Alexandre Duret-Lutz

I'm happy to announce the the following article has been accepted in to the 17th International Symposium on Automated Technology for Verification and Analysis (ATVA'19), to be held on October 27-31, 2019 in Taipei, Taiwan. Generic Emptiness Check for Fun and Profit Christel Baier (1), František Blahoudek (2), Alexandre Duret-Lutz (3), Joachim Klein (1), David Müller (1), and Jan Strejček (4) (1) Technische Universität Dresden, Germany (2) University of Mons, Belgium (3) LRDE, EPITA, Le Kremlin-Bicêtre, France (4) Masaryk University, Brno, Czech Republic We present a new algorithm for checking the emptiness of ω-automata with an Emerson-Lei acceptance condition (i.e., a positive Boolean formula over sets of states or transitions that must be visited infinitely or finitely often). The algorithm can also solve the model checking problem of probabilistic positiveness of MDP under a property given as a deterministic Emerson-Lei automaton. Although both these problems are known to be NP-complete and our algorithm is exponential in general, it runs in polynomial time for simpler acceptance conditions like generalized Rabin, Streett, or parity. In fact, the algorithm provides a unifying view on emptiness checks for these simpler automata classes. We have implemented the algorithm in Spot and PRISM and our experiments show improved performance over previous solutions. https://www.lrde.epita.fr/wiki/Publications/baier.19.atva -- Alexandre Duret-Lutz

5 years, 4 months

Spot 2.8 released

by Alexandre Duret-Lutz

We are happy to announce the release of Spot 2.8 Spot is a library of algorithms for manipulating LTL formulas and omega-automata objects (as commonly used in model checking). This release contains code contributed by Clément Gillard and myself. A detailed list of new features is given at the end of this email. You can find the new release here: http://www.lrde.epita.fr/dload/spot/spot-2.8.tar.gz See https://spot.lrde.epita.fr/ for documentation and installation instructions. Note that since Debian 10 ("Buster") was released a few days ago, the "stable" Debian packages we distribute are now built for Buster. As always, please direct any feedback to <spot(a)lrde.epita.fr>. New in spot 2.8 (2019-07-10) Command-line tools: - autfilt learned --highlight-accepting-run=NUM to highlight some accepting run with color NUM. - ltldo, ltlcross, and autcross are now preferring posix_spawn() over fork()+exec() when available. - ltlcross has new options --determinize-max-states=N and --determinize-max-edges=M to restrict the use of determinization-based complementation to cases where it produces automata with at most N states and M edges. By default determinization is now attempted up to 500 states and 5000 edges. This is an improvement over the previous default where determinization-based complementation was not performed at all, unless -D was specified. - ltlcross will now skip unnecessary cross-checks and consistency-checks (they are unnecessary when all automata could be complemented and statistics were not required). - genaut learned --m-nba=N to generate Max Michel's NBA familly. (NBAs with N+1 states whose determinized have at least N! states.) - Due to some new simplification of parity acceptance, the output of "ltl2tgba -P -D" is now using a minimal number of colors. This means that recurrence properties have an acceptance condition among "Inf(0)", "t", or "f", and persistance properties have an acceptance condition among "Fin(0)", "t", or "f". - ltldo and ltlcross learned shorthands to call the tools ltl2na, ltl2nba, and ltl2ngba from Owl 19.06. Similarly, autcross learned a shorthand for Owl's dra2dpa. Documentation: - https://spot.lrde.epita.fr/tut90.html is a new file that explains the purpose of the spot::bdd_dict object. Library: - Add generic_accepting_run() as a variant of generic_emptiness_check() that returns an accepting run in an automaton with any acceptance condition. - twa::accepting_run() and twa::intersecting_run() now work on automata using Fin in their acceptance condition. - simulation-based reductions have learned a trick that sometimes improve transition-based output when the input is state-based. (The automaton output by 'ltl2tgba -B GFa | autfilt --small' now has 1 state instead of 2 in previous versions. Similarly, 'ltldo ltl2dstar -f 'GFa -> GFb' | autfilt --small' produces 1 state instead of 4.) - simulation-based reductions hae learned another trick to better merge states from transiant SCCs. - acc_cond::top_disjuncts() and acc_cond::top_conjuncts() can be used to split an acceptance condition on the top-level & or |. These methods also exist in acc_cond::acc_code. - minimize_obligation() learned to work on very weak automata even if the formula or negated automaton are not supplied. (This allows "autfilt [-D] --small" to minimize very-weak automata whenever they are found to represent obligation properties.) - There is a new spot::scc_and_mark_filter objet that simplifies the creation of filters to restrict spot::scc_info to some particular SCC while cutting new SCCs on given acceptance sets. This is used by spot::generic_emptiness_check() when processing SCCs recursively, and makes it easier to write similar code in Python. - print_dot has a new option 'g', to hide edge labels. This is helpful to display automata as "graphs", e.g., when illustrating algorithms that do not care about labels. - A new complement() function returns complemented automata with unspecified acceptance condition, allowing different algorithms to be used. The output can be alternating only if the input was alternating. - There is a new class output_aborter that is used to specify upper bounds on the size of automata produced by some algorithms. Several functions have been changed to accept an output_aborter. This includes: * tgba_determinize() * tgba_powerset() * minimize_obligation() * minimize_wdba() * remove_alternation() * product() * the new complement() * the postprocessor class, via the "det-max-state" and "det-max-edges" options. - SVA's first_match operator can now be used in SERE formulas and that is supported by the ltl_to_tgba_fm() translation. See doc/tl/tl.pdf for the semantics. *WARNING* Because this adds a new operator, any code that switches over the spot::op type may need a new case for op::first_match. Furthermore, the output of "randltl --psl" will be different from previous releases. - The parser for SERE learned to recognize the ##n and ##[i:j] operators from SVA. So {##2 a ##0 b[+] ##1 c ##2 e} is another way to write {[*2];a:b[+];c;1;e}. The syntax {a ##[i:j] b} is replaced in different ways depending on the values of i, a, and b. The formula::sugar_delay() function implements this SVA operator in terms of the existing PSL operators. ##[+] and ##[*] are sugar for ##[1:$] and ##[0:$]. - The F[n:m] and G[n:m] operators introduced in Spot 2.7 now support the case where m=$. - spot::relabel_apply() makes it easier to reverse the effect of spot::relabel() or spot::relabel_bse() on formula. - The LTL simplifier learned the following rules: F(G(a | Fb)) = FGa | GFb (if option "favor_event_univ") G(F(a | Gb)) = GFa | FGb (if option "favor_event_univ") F(G(a & Fb) = FGa & GFb (unless option "reduce_size_strictly") G(F(a & Gb)) = GFa & FGb (unless option "reduce_size_strictly") GF(f) = GF(dnf(f)) (unless option "reduce_size_strictly") FG(f) = FG(cnf(f)) (unless option "reduce_size_strictly") (f & g) R h = f R h if h implies g (f & g) M h = f M h if h implies g (f | g) W h = f W h if g implies h (f | g) U h = f U h if g implies h Gf | F(g & eventual) = f W (g & eventual) if !f implies g Ff & G(g | universal) = f M (g | universal) if f implies !g f U (g & eventual) = F(g & eventual) if !f implies g f R (g | universal) = G(g | universal) if f implies !g - cleanup_parity() and colorize_parity() were cleaned up a bit, resulting in fewer colors used in some cases. In particular, colorize_parity() learned that coloring transitiant edges does not require the introduction of a new color. - A new reduce_parity() function implements and generalizes the algorithm for minimizing parity acceptance by Carton and Maceiras (Computing the Rabin index of a parity automaton, 1999). This is a better replacement for cleanup_parity() and colorize_parity(). See https://spot.lrde.epita.fr/ipynb/parity.html for examples. - The postprocessor and translator classes are now using reduce_parity() for further simplifications. - The code for checking recurrence/persistence properties can also use the fact the reduce_parity() with return "Inf(0)" (or "t" or "f") for deterministic automata corresponding to recurrence properties, and "Fin(0)" (or "t" or "f") for persistence properties. This can be altered with the SPOT_PR_CHECK environment variable. Deprecation notices: - The virtual function twa::intersecting_run() no longuer takes a second "from_other" Boolean argument. This is a backward incompatibility only for code that overrides this function in a subclass. For backward compatibility with programs that simply call this function with two argument, a non-virtual version of the function has been introduced and marked as deprecated. - The spot::acc_cond::format() methods have been deprecated. These were used to display acceptance marks, but acceptance marks are unrelated to acceptance conditions, so it's better to simply print marks with operator<< without this extra step. Bugs fixed: - The gf_guarantee_to_ba() is relying on an inplace algorithm that could produce a different number of edges for the same input in two different transition order. - A symmetry-based optimization of the LAR algorithm performed in spot::to_parity() turned out to be incorrect. The optimization has been removed. "ltlsynt --algo=lar" is the only code using this function currently. -- Alexandre Duret-Lutz

5 years, 5 months

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