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[Seminaire-LRDE] Changement de date : Mercredi 14 octobre 2015 : Tamy Boubekeur, Telecom ParisTech

by Daniela Becker

Chers collègues, Pour la prochaine session du séminaire Performance et Généricité du LRDE (Laboratoire de Recherche et Développement de l'EPITA) il y a un changement de date et d’horaire : elle aura lieu le Mercredi 14 octobre 2015 à 11h30--12h30, Salle L0 du LRDE. 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/2015-10-14 [4] http://www.lrde.epita.fr/Contact Au programme du Mercredi 14 octobre 2015 : * 11h30: Intégrales de Morton pour la Simplification Géométrique Haute Vitesse -- Tamy Boubekeur, Telecom ParisTech - CNRS - University Paris-Saclay http://perso.telecom-paristech.fr/~boubek/ Le traitement géométrique 3D temps-réel a progressivement atteint un niveau de performance rendant un grand nombre de primitives inspirées du traitement du signal compatible avec les applications interactives. Cela a souvent été rendu possible grâce à la co-conception des opérateurs, des structures de données et du support matériel d’exécution. Parmi les principales classes d'opérateurs géométriques, le filtrage et le sur-échantillonnage (par raffinement) ont été exprimés sous des contraintes temps-réel avec succès. Cependant, l'opérateur de sous-échantillonnage --- la simplification adaptative --- demeure un cas problématique pour les données non triviales. Dans ce contexte, nous proposons un nouvel algorithme de simplification géométrique rapide basé sur un nouveau concept : les intégrales de Morton. En sommant les quadriques d'erreurs associées aux échantillons géométriques selon leur ordre de Morton, notre approche permet d'extraire de manière concurrente les nœuds correspondants à une coupe adaptative dans la hiérarchie implicite ainsi définie, et d'optimiser la position des sommets du maillage simplifié en parallèle. Cette méthode est inspirée des images intégrales et exploite les avancées récentes en construction et parcours haute performance de hiérarchies spatiales. L'implémentation GPU de notre approche peut simplifier des maillages composés de plusieurs millions d'éléments à un taux de rafraîchissement interactif, tout en fournissant une géométrie simplifiée de qualité supérieure aux méthodes uniformes et en préservant notamment les structures géométriques saillantes. Notre algorithme est compatible avec les maillages indexés, les soupes polygonales et les nuages de points, et peut prendre en compte des attributs de surfaces (normal ou couleur par exemple) et des métriques d'erreurs alternatives. -- Tamy Boubekeur est Professeur en Science Informatique à Télécom ParisTech (Institut Mines-Télécom, CNRS UMR 5141, Université Paris-Saclay). Il mène ses activités de recherche dans le domaine de l’informatique graphique 3D, s'intéressant tout particulièrement à la modélisation et à la synthèse de formes, de matières et d’animation 3D numériques, mais également aux systèmes visuels interactifs à hautes performances. -- De 2004 à 2007, il a été membre de l’INRIA Bordeaux (France) et chercheur invité régulier à l’Université de Colombie Britannique à Vancouver (Canada). Il a obtenu son Doctorat en Informatique à l’Université des Sciences et Technologies de Bordeaux en 2007. Par la suite, il a rejoint l’Unversité Technique de Berlin (TU Berlin) comme chercheur associé. En 2008, il a rejoint le Département de Traitement du Signal et des Images de Télécom ParisTech comme Maître de Conférences et a créé le groupe d’informatique graphique. Il a obtenu son Habilitation à Diriger des Recherches (HDR) en Informatique à l’Université Paris XI en 2012 avant de devenir Professeur à Télécom ParisTech en 2013. 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. _______________________________________________ Seminaire mailing list Seminaire(a)lrde.epita.fr https://lists.lrde.epita.fr/listinfo/seminaire

9 years, 8 months

[Seminaire-LRDE] Merc. 7 oct. 2015: Tamy Boubekeur, Telecom ParisTech

by Akim Demaille

Chers collègues, La prochaine session du séminaire Performance et Généricité du LRDE (Laboratoire de Recherche et Développement de l'EPITA) aura lieu le Mercredi 7 octobre 2015 (11h--12h), Salle L0 du LRDE. 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/2015-10-07 [4] http://www.lrde.epita.fr/Contact Au programme du Mercredi 7 octobre 2015 : * 11h00: Intégrales de Morton pour la Simplification Géométrique Haute Vitesse -- Tamy Boubekeur, Telecom ParisTech - CNRS - University Paris-Saclay http://perso.telecom-paristech.fr/~boubek/ Le traitement géométrique 3D temps-réel a progressivement atteint un niveau de performance rendant un grand nombre de primitives inspirées du traitement du signal compatible avec les applications interactives. Cela a souvent été rendu possible grâce à la co-conception des opérateurs, des structures de données et du support matériel d’exécution. Parmi les principales classes d'opérateurs géométriques, le filtrage et le sur-échantillonnage (par raffinement) ont été exprimés sous des contraintes temps-réel avec succès. Cependant, l'opérateur de sous-échantillonnage – la simplification adaptative – demeure un cas problématique pour les données non triviales. Dans ce contexte, nous proposons un nouvel algorithme de simplification géométrique rapide basé sur un nouveau concept : les intégrales de Morton. En sommant les quadriques d'erreurs associées aux échantillons géométriques selon leur ordre de Morton, notre approche permet d'extraire de manière concurrente les nœuds correspondants à une coupe adaptative dans la hiérarchie implicite ainsi définie, et d'optimiser la position des sommets du maillage simplifié en parallèle. Cette méthode est inspirée des images intégrales et exploite les avancées récentes en construction et parcours haute performance de hiérarchies spatiales. L'implémentation GPU de notre approche peut simplifier des maillages composés de plusieurs millions d'éléments à un taux de rafraîchissement interactif, tout en fournissant une géométrie simplifiée de qualité supérieure aux méthodes uniformes et en préservant notamment les structures géométriques saillantes. Notre algorithme est compatible avec les maillages indexés, les soupes polygonales et les nuages de points, et peut prendre en compte des attributs de surfaces (normal ou couleur par exemple) et des métriques d'erreurs alternatives. -- Tamy Boubekeur est Professeur en Science Informatique à Télécom ParisTech (Institut Mines-Télécom, CNRS UMR 5141, Université Paris-Saclay). Il mène ses activités de recherche dans le domaine de l’informatique graphique 3D, s'intéressant tout particulièrement à la modélisation et à la synthèse de formes, de matières et d’animation 3D numériques, mais également aux systèmes visuels interactifs à hautes performances. De 2004 à 2007, il a été membre de l’INRIA Bordeaux (France) et chercheur invité régulier à l’Université de Colombie Britannique à Vancouver (Canada). Il a obtenu son Doctorat en Informatique à l’Université des Sciences et Technologies de Bordeaux en 2007. Par la suite, il a rejoint l’Unversité Technique de Berlin (TU Berlin) comme chercheur associé. En 2008, il a rejoint le Département de Traitement du Signal et des Images de Télécom ParisTech comme Maître de Conférences et a créé le groupe d’informatique graphique. Il a obtenu son Habilitation à Diriger des Recherches (HDR) en Informatique à l’Université Paris XI en 2012 avant de devenir Professeur à Télécom ParisTech en 2013. 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. _______________________________________________ Seminaire mailing list Seminaire(a)lrde.epita.fr https://lists.lrde.epita.fr/listinfo/seminaire

9 years, 8 months

L'air de rien 34.0

by Daniela Becker

Bonjour, nous avons le plaisir de vous annoncer la sortie du n°34 du bulletin du LRDE. C'est un numéro Spécial Rentrée qui présente l'ensemble des permanents du LRDE. Vous y trouverez également un aperçu des activités du LRDE et de la majeure CSI dont font partie tous les élèves épitéens intégrant le labo. Vous pouvez télécharger le bulletin en couleur à la page suivante : https://www.lrde.epita.fr/wiki/Latest_issue -- Daniela Becker Responsable administrative du LRDE

9 years, 8 months

publication: SAT-based Minimization of Deterministic ω-Automata (LPAR'15)

by Alexandre Duret-Lutz

I am happy to announce that the following papers has been accepted at the 20th International Conferences on Logic for Programming, Artificial Intelligence and Reasoning (LPAR) to be held at the University of the South Pacific (Suva, Fiji) on 24–28 November 2015. SAT-based Minimization of Deterministic ω-Automata Souheib Baarir¹, Alexandre Duret-Lutz¹ ¹LRDE, EPITA, Le Kremlin-Bicêtre, France https://www.lrde.epita.fr/wiki/Publications/baarir.15.lpar Abstract: We describe a tool that inputs a deterministic ω-automaton with any acceptance condition, and synthesizes an equivalent ω-automaton with another arbitrary acceptance condition and a given number of states, if such an automaton exist. This tool, that relies on a SAT-based encoding of the problem, can be used to provide minimal ω-automata equivalent to given properties, for different acceptance conditions. -- Alexandre Duret-Lutz

9 years, 9 months

nouvelle publication

by Souheib Baarir

I am happy to announce that the following paper has been accepted in the International Conferences on Logic for Programming, Artificial Intelligence and Reasoning (LPAR’15) : SAT-based Minimization of Deterministic ω-Automata Souheib Baarir and Alexandre Duret-Lutz. LRDE, EPITA, Le Kremlin-Bicêtre, France A+, Soheib.

9 years, 9 months

L'air de rien 33.0

by Daniela Becker

Bonjour, nous avons le plaisir de vous annoncer la sortie du n°33 du bulletin du LRDE. C'est un numéro spécial dédié aux séminaires des étudiants-chercheurs du LRDE qui auront lieu le lundi 6 juillet 2015. Vous y trouverez le programme des deux demi-journées avec les résumés des présentations. Nous y présentons également les nouveaux stagiaires et les futurs thésards qui nous ont rejoints cette année. Vous pouvez télécharger le bulletin en couleur à la page suivante : http://www.lrde.epita.fr/wiki/LrdeBulletin/l-air-de-rien-33 -- Daniela Becker

9 years, 11 months

Declt 1.1 is released

by Didier Verna

Hello, I'm happy to announce the release of Declt version 1.1. Declt is a reference manual generator for Common Lisp ASDF systems. Get it here: https://www.lrde.epita.fr/~didier/software/lisp/misc.php#declt New in this release: * Declt now properly documents complex system and component dependencies (:feature, :version and :require notably), * Declt advertises a system's :if-feature conditional if any, * Finally, and more importantly, Declt is no more limited to the documentation of a single system. Given a main system to document, any subsystem (that is, other systems we depend on and which are part of the same distribution) will be documented in the same reference manual. General Description: Declt (pronounce “dec’let”) is a reference manual generator for Common Lisp libraries. It works by loading an ASDF system and introspecting its contents. The generated documentation contains the description of the system itself and its local dependencies (other systems in the same distribution): components (modules and files), packages and definitions found in those packages. Exported and internal definitions are listed separately. This allows the reader to have a quick view on the library’s public API. Within each section, definitions are sorted lexicographically. In addition to ASDF system components and packages, Declt documents the following definitions: constants, special variables, symbol macros, macros, setf expanders, compiler macros, functions (including setf ones), generic functions and methods (including setf ones), method combinations, conditions, structures, classes and types. The generated documentation includes every possible bit of information that introspecting can provide: documentation strings, lambda lists (including qualifiers and specializers where appropriate), slots (including type, allocation and initialization arguments), definition source file etc. Every documented item provides a full set of cross-references to related items: ASDF component dependencies, parents and children, classes direct methods, super and subclasses, slot readers and writers, setf expanders access and update functions etc. Finally, Declt produces exhaustive and multiple-entry indexes for every documented item. Reference manuals are generated in Texinfo format (compatible, but not requiring Texinfo 5). From there it is possible to produce readable / printable output in info, HTML, PDF, DVI and PostScript with tools such as makeinfo, texi2dvi or texi2pdf. The primary example of documentation generated by Declt is the Declt reference manual itself. -- My new Jazz CD entitled "Roots and Leaves" is out! Check it out: http://didierverna.com/records/roots-and-leaves.php Lisp, Jazz, Aïkido: http://www.didierverna.info

9 years, 11 months

Spot 1.99.1 released

by Alexandre Duret-Lutz

Spot is a C++11 library for ω-automata manipulation and model checking. This release contains 713 patches contribued over the last 18 months by Thibaud Michaud, Étienne Renault, Alexandre Lewkowicz, and myself. As the name suggests, this release reflects a huge progress towards Spot 2.0, but we are not quite there yet: the only thing you should not consider as stable in this release is the C++ API, as it should change a lot as we march towards version 2.0. This release also comes with a new web site at https://spot.lrde.epita.fr/ and Debian packages. See https://spot.lrde.epita.fr/install.html for installation instructions, or grab the source tarball directly at https://www.lrde.epita.fr/dload/spot/spot-1.99.1.tar.gz New in spot 1.99.1 (2015-06-23) * Major changes motivating the jump in version number - Spot now works with automata that can represent more than generalized Büchi acceptance. Older versions were built around the concept of TGBA (Transition-based Generalized Büchi Automata) while this version now deals with what we call TωA (Transition-based ω-Automata). TωA support arbitrary acceptance conditions specified as a Boolean formula of transition sets that must be visited infinitely often or finitely often. This genericity allows for instance to represent Rabin or Streett automata, as well as some generalized variants of those. - Spot has near complete support for the Hanoi Omega Automata format. http://adl.github.io/hoaf/ This formats supports automata with the generic acceptance condition described above, and has been implemented in a number of third-party tools (see http://adl.github.io/hoaf/support.html) to ease their interactions. The only part of the format not yet implemented in Spot is the support for alternating automata. - Spot is now compiling in C++11 mode. The set of C++11 features we use requires GCC >= 4.8 or Clang >= 3.5. Although GCC 4.8 is more than 2-year old, people with older installations won't be able to install this version of Spot. - As a consequence of the switches to C++11 and to TωA, a lot of the existing C++ interfaces have been renamed, and sometime reworked. This makes this version of Spot not backward compatible with Spot 1.2.x. See below for the most important API changes. Furtheremore, the reason this release is not called Spot 2.0 is that we have more of those changes planned. - Support for Python 2 was dropped. We now support only Python 3.2 or later. The Python bindings have been improved a lot, and include some convenience functions for better integration with IPython's rich display system. User familiar with IPython's notebook should have a look at the notebook files in wrap/python/tests/*.ipynb * Major news for the command-line tools - The set of tools installed by spot now consists in the following 11 commands. Those marked with a '+' are new in this release. - randltl Generate random LTL/PSL formulas. - ltlfilt Filter and convert LTL/PSL formulas. - genltl Generate LTL formulas from scalable patterns. - ltl2tgba Translate LTL/PSL formulas into Büchi automata. - ltl2tgta Translate LTL/PSL formulas into Testing automata. - ltlcross Cross-compare LTL/PSL-to-Büchi translators. + ltlgrind Mutate LTL/PSL formula. - dstar2tgba Convert deterministic Rabin or Streett automata into Büchi. + randaut Generate random automata. + autfilt Filter and convert automata. + ltldo Run LTL/PSL formulas through other tools. randaut does not need any presentation: it does what you expect. ltlgrind is a new tool that mutates LTL or PSL formulas. If you have a tool that is bogus on some formula that is too large to debug, you can use ltlgrind to generate smaller derived formulas and see if you can reproduce the bug on those. autfilt is a new tool that processes a stream of automata. It allows format conversion, filtering automata based on some properties, and general transformations (e.g., change of acceptance conditions, removal of useless states, product between automata, etc.). ltldo is a new tool that runs LTL/PSL formulas through other tools, but uses Spot's command-line interfaces for specifying input and output. This makes it easier to use third-party tool in a pipe, and it also takes care of some necessary format conversion. - ltl2tgba has a new option, -U, to produce unambiguous automata. In unambiguous automata any word is recognized by at most one accepting run, but there might be several ways to reject a word. This works for LTL and PSL formulas. - ltl2tgba has a new option, -S, to produce generalized-Büchi automata with state-based acceptance. Those are obtained by converting some transition-based GBA into a state-based GBA, so they are usually not as small as one would wish. The same option -S is also supported by autfilt. - ltlcross will work with translator producing automata with any acceptance condition, provided the output is in the HOA format. So it can effectively be used to validate tools producing Rabin or Streett automata. - ltlcross has several new options: --grind attempts to reduce the size of any bogus formula it discovers, while still exhibiting the bug. --ignore-execution-failures ignores cases where a translator exits with a non-zero status. --automata save the produced automata into the CSV or JSON file. Those automata are saved using the HOA format. ltlcross will also output two extra columns in its CSV/JSON output: "ambiguous_aut" and "complete_aut" are Boolean that respectively tells whether the automaton is ambiguous and complete. - "ltlfilt --stutter-invariant" will now work with PSL formulas. The implementation is actually much more efficient than our previous implementation that was only for LTL. - ltlfilt's old -q/--quiet option has been renamed to --ignore-errors. The new -q/--quiet semantic is the same as in grep (and also autfilt): disable all normal input, for situtations where only the exit status matters. - ltlfilt's old -n/--negate option can only be used as --negate now. The short '-n NUM' option is now the same as the new --max-count=N option, for consistency with other tools. - ltlfilt has a new --count option to count the number of matching automata. - ltlfilt has a new --exclusive-ap option to constrain formulas based on a list of mutually exclusive atomic propositions. - ltlfilt has a new option --define to be used in conjunction with --relabel or --relabel-bool to print the mapping between old and new labels. - all tools that produce formulas or automata now have an --output (a.k.a. -o) option to redirect that output to a file instead of standard output. The name of this file can be constructed using the same %-escape sequences that are available for --stats or --format. - all tools that output formulas have a -0 option to separate formulas with \0. This helps in conjunction with xargs -0. - all tools that output automata have a --check option that request extra checks to be performed on the output to fill in properties values for the HOA format. This options implies -H for HOA output. For instance ltl2tgba -H 'formula' will declare the output automaton as 'stutter-invariant' only if the formula is syntactically stutter-invariant (e.g., in LTL\X). With ltl2tgba --check 'formula' additional checks will be performed, and the automaton will be accurately marked as either 'stutter-invariant' or 'stutter-sensitive'. Another check performed by --check is testing whether the automaton is unambiguous. - ltlcross (and ltldo) have a list of hard-coded shorthands for some existing tools. So for instance running 'ltlcross spin ...' is the same as running 'ltlcross "spin -f %s>%N" ...'. This feature is much more useful for ltldo. - For options that take an output filename (i.e., ltlcross's --save-bogus, --grind, --csv, --json) you can force the file to be opened in append mode (instead of being truncated) by by prefixing the filename with ">>". For instance --save-bogus=">>bugs.ltl" will append to the end of the file. * Other noteworthy news - The web site moved to http://spot.lrde.epita.fr/. - We now have Debian packages. See http://spot.lrde.epita.fr/install.html - The documentation now includes some simple code examples for both Python and C++. (This is still a work in progress.) - The curstomized version of BuDDy (libbdd) used by Spot has be renamed as (libbddx) to avoid issues with copies of BuDDy already installed on the system. - There is a parser for the HOA format (http://adl.github.io/hoaf/) available as a spot::automaton_stream_parser object or spot::parse_aut() function. The former version is able to parse a stream of automata in order to do batch processing. This format can be output by all tools (since Spot 1.2.5) using the --hoa option, and it can be read by autfilt (by default) and ltlcross (using the %H specifier). The current implementation does not support alternation. Multiple initial states are converted into an extra initial state; complemented acceptance sets Inf(!x) are converted to Inf(x); explicit or implicit labels can be used; aliases are supported; "--ABORT--" can be used in a stream. - The above HOA parser can also parse never claims, and LBTT automata, so the never claim parser and the LBTT parser have been removed. This implies that autfilt can input a mix of HOA, never claims, and LBTT automata. ltlcross also use the same parser for all these output, and the old %T and %N specifiers have been deprecated and replaced by %O (for output). - While not all algorithms in the library are able to work with any acceptance condition supported by the HOA format, the following two new functions mitigate that: - remove_fin() takes a TωA whose accepting condition uses Fin(x) primitive, and produces an equivalent TωA without Fin(x): i.e., the output acceptance is a disjunction of generalized Büchi acceptance. This type of acceptance is supported by SCC-based emptiness-check, for instance. - similarly, to_tgba() converts any TωA into an automaton with generalized-Büchi acceptance. - randomize() is a new algorithm that randomly reorders the states and transitions of an automaton. It can be used from the command-line using "autfilt --randomize". - the interface in iface/dve2 has been renamed to iface/ltsmin because it can now interface the dynamic libraries created either by Divine (as patched by the LTSmin group) or by Spins (the LTSmin compiler for Promela). - LTL/PSL formulas can include /* comments */. - PSL SEREs support a new operator [:*i..j], the iterated fusion. [:*i..j] is to the fusion operator ':' what [*i..j] is to the concatenation operator ';'. For instance (a*;b)[:*3] is the same as (a*;b):(a*;b):(a*;b). The operator [:+], is syntactic sugar for [:*1..], and corresponds to the operator ⊕ introduced by Dax et al. (ATVA'09). - GraphViz output now uses an horizontal layout by default, and also use circular states (unless the automaton has more than 100 states, or uses named-states). The --dot option of the various command-line tools takes an optional parameter to fine-tune the GraphViz output (including vertical layout, forced circular or elliptic states, named automata, SCC information, ordered transitions, and different ways to colorize the acceptance sets). The environment variables SPOT_DOTDEFAULT and SPOT_DOTEXTRA can also be used to respectively provide a default argument to --dot, and add extra attributes to the output graph. - Never claims can now be output in the style used by Spin since version 6.2.4 (i.e., using do..od instead of if..fi, and with atomic statements for terminal acceptance). The default output is still the old one for compatibility with existing tools. The new style can be requested from command-line tools using option --spin=6 (or -s6 for short). - Support for building unambiguous automata. ltl_to_tgba() has a new options to produce unambiguous TGBA (used by ltl2tgba -U as discussed above). The function is_unambiguous() will check whether an automaton is unambigous, and this is used by autfilt --is-unmabiguous. - The SAT-based minimization algorithm for deterministic automata has been updated to work with ω-Automaton with any acceptance. The input and the output acceptance can be different, so for instance it is possible to create a minimal deterministic Streett automaton starting from a deterministic Rabin automaton. This functionnality is available via autfilt's --sat-minimize option. See doc/userdoc/satmin.html for details. - The on-line interface at http://spot.lrde.epita.fr/trans.html can be used to check stutter-invariance of any LTL/PSL formula. - The on-line interface will work around atomic propositions not supported by ltl3ba. (E.g. you can now translate F(A) or G("foo < bar").) * Noteworthy code changes - Boost is not used anymore. - Automata are now manipulated exclusively via shared pointers. - Most of what was called tgba_something is now called twa_something, unless it is really meant to work only for TGBA. This includes functions, classes, file, and directory names. For instance the class tgba originally defined in tgba/tgba.hh, has been replaced by the class twa defined in twa/twa.hh. - the tgba_explicit class has been completely replaced by a more efficient twa_graph class. Many of the algorithms that were written against the abstract tgba (now twa) interface have been rewritten using twa_graph instances as input and output, making the code a lot simpler. - The tgba_succ_iterator (now twa_succ_iterator) interface has changed. Methods next(), and first() should now return a bool indicating whether the current iteration is valid. - The twa base class has a new method, release_iter(), that can be called to give a used iterator back to its automaton. This iterator is then stored in a protected member, iter_cache_, and all implementations of succ_iter() can be updated to recycle iter_cache_ (if available) instead of allocating a new iterator. - The tgba (now called twa) base class has a new method, succ(), to support C++11' range-based for loop, and hide all the above change. Instead of the following syntax: tgba_succ_iterator* i = aut->succ_iter(s); for (i->first(); !i->done(); i->next()) { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } delete i; We now prefer: for (auto i: aut->succ(s)) { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } And the above syntax is really just syntactic suggar for twa_succ_iterator* i = aut->succ_iter(s); if (i->first()) do { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } while (i->next()); aut->release_iter(i); // allow the automaton to recycle the iterator Where the virtual calls to done() and delete have been avoided. - twa::succ_iter() now takes only one argument. The optional global_state and global_automaton arguments have been removed. - The following methods have been removed from the TGBA interface and all their subclasses: - tgba::support_variables() - tgba::compute_support_variables() - tgba::all_acceptance_conditions() // use acc().accepting(...) - tgba::neg_acceptance_conditions() - tgba::number_of_acceptance_conditions() // use acc().num_sets() - Membership to acceptance sets are now stored using bit sets, currently limited to 32 bits. Each TωA has a acc() method that returns a reference to an acceptance object (of type spot::acc_cond), able to operate on acceptance marks (spot::acc_cond::mark_t). Instead of writing code like i->current_acceptance_conditions() == aut->all_acceptance_conditions() we now write aut->acc().accepting(i->current_acceptance_conditions()) (Note that for accepting(x) to return something meaningful, x should be a set of acceptance sets visitied infinitely often. So let's imagine that in the above example i is looking at a self-loop.) Similarly, aut->number_of_acceptance_conditions() is now aut->acc().num_sets() - All functions used for printing LTL/PSL formulas or automata have been renamed to print_something(). Likewise the various parsers should be called parse_something() (they haven't yet all been renamed). - All test suites under src/ have been merged into a single one in src/tests/. The testing tool that was called src/tgbatest/ltl2tgba has been renamed as src/tests/ikwiad (short for "I Know What I Am Doing") so that users should be less tempted to use it instead of src/bin/ltl2tgba. * Removed features - The long unused interface to GreatSPN (or rather, interface to a non-public, customized version of GreatSPN) has been removed. As a consequence, we could get rid of many cruft in the implementation of Couvreur's FM'99 emptiness check. - Support for symbolic, BDD-encoded TGBAs has been removed. This includes the tgba_bdd_concrete class and associated supporting classes, as well as the ltl_to_tgba_lacim() LTL translation algorithm. Historically, this TGBA implementation and LTL translation were the first to be implemented in Spot (by mistake!) and this resulted in many bad design decisions. In practice they were of no use as we only work with explicit automata (i.e. not symbolic) in Spot, and those produced by these techniques are simply too big. - All support for ELTL, i.e., LTL logic extended with operators represented by automata has been removed. It was never used in practice because it had no practical user interface, and the translation was a purely-based BDD encoding producing huge automata (when viewed explictely), using the above and non longuer supported tgba_bdd_concrete class. - Our implementation of the Kupferman-Vardi complementation has been removed: it was unused in practice beause of the size of the automata built, and it did not survive the conversion of acceptance sets from BDDs to bitsets. - The unused implementation of state-based alternating Büchi automata has been removed. - Input and output in the old, Spot-specific, text format for TGBA, has been fully removed. We now use HOA everywhere. (In case you have a file in this format, install Spot 1.2.6 and use "src/tgbatest/ltl2tgba -H -X file" to convert the file to HOA.) -- Alexandre Duret-Lutz

9 years, 11 months

[Lrde] Publication accepted at ICDAR 2015

by Ana Stefania Calarasanu

I am happy to announce that the following paper has been accepted to the 13th International Conference on Document Analysis and Recognition (ICDAR) that will take place in Gammarth, Tunisia, on August 23 - 26, 2015: Using histogram representation and Earth Mover's Distance as an evaluation tool for text detection Stefania Calarasanu (1), Jonathan Fabrizio (1) and Séverine Dubuisson (2) (1) LRDE-EPITA, 14-16, rue Voltaire, F-94276, Le Kremlin Bicêtre, France (2) CNRS, UMR 7222, ISIR, F-75005, Paris, France Abstract: In the context of text detection evaluation, it is essential to use protocols that are capable of describing both the quality and the quantity aspects of detection results. In this paper we propose a novel visual representation and evaluation tool that captures the whole nature of a detector by using histograms. First, two histograms (coverage and accuracy) are generated to visualize the different characteristics of a detector. Secondly, we compare these two histograms to a so called optimal one to compute representative and comparable scores. To do so, we introduce the usage of the Earth Mover's Distance as a reliable evaluation tool to estimate recall and precision scores. Results obtained on the ICDAR 2013 dataset show that this method intuitively characterizes the accuracy of a text detector and gives at a glance various useful characteristics of the analyzed algorithm. Ana Stefania Calarasanu ___________________________________________________ PhD Student EPITA Research and Development Laboratory (LRDE) 14-16 rue Voltaire, 94276 Le Kremlin-Bicêtre CEDEX, France https://www.lrde.epita.fr/wiki/User:Calarasanu _______________________________________________ Annonce mailing list Annonce(a)lrde.epita.fr https://lists.lrde.epita.fr/listinfo/annonce

9 years, 12 months

New publication: How to Make nD Images Well-composed without Interpolation (ICIP'15)

by nboutry

I am happy to announce that the following paper has been accepted at the 22th IEEE International Conference on Image Processing (ICIP'2015), to be held on September 27-30 in Québec City, Canada. How to make nD images well-composed without interpolation Nicolas Boutry¹², Thierry Géraud¹, Laurent Najman² ¹ EPITA Research and Development Laboratory (LRDE) ² Université Paris-Est, LIGM, Équipe A3SI, ESIEE Paris https://www.lrde.epita.fr/wiki/Publications/boutry.15.icip Abstract: Latecki et al. have introduced the notion of well-composed images, i.e., a class of images free from the connectivities paradox of discrete topology. Unfortunately natural and synthetic images are not a priori well-composed, usually leading to topological issues. Making any nD image well-composed is interesting because, after- wards, the classical connectivities of components are equivalent, the component boundaries satisfy the Jordan separation theorem, and so on. In this paper, we propose an algorithm able to make nD images well-composed without any interpolation. We illustrate on text detection the benefits of having strong topological properties.

10 years

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