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PageRank
                          Algorithme de Google




vendredi 22 février 13
Algorithme

                         • Nom latinisé du mathématicien perse Al-Khawarizmi
                         • « Un algorithme est une suite finie et non ambiguë d’opérations
                           ou d’instruction permettant de résoudre un problème. »1
                         • Il y a des entrées, des instructions et des résultats
                         • Algorithme mathématique et non mathématique
                         • Formule d’exécution d’actions



                          1- http://fr.wikipedia.org/wiki/Algorithme



vendredi 22 février 13
Exemple d’algorithme

                         Entrées       Instructions       Résultats




                                   +                  =

vendredi 22 février 13
Algorithme de                                          .




                                Trouver le résultat le plus pertinent



                               PageRank



                 Entrée                                             Résultat
                   Recherche
                                                                        Liste de liens




vendredi 22 février 13
Qu’est-ce que le PageRank?
                         • Lary Page
                         • Une page = une note
                         • Note entre 0 et 10 (PR6)
                         • Défini selon la valeur des liens entrants

                                                  Lien
                                          A                B
                                        Sortant          Entrant

vendredi 22 février 13
Comment calculer le PageRank?
                              Quantité       Qualité
                          A   A

                          A   A

                          A   A          B
                          A   A

                          A   A

vendredi 22 février 13
Comment calculer le PageRank?
                            Quantité        Qualité
                                                      C
                                        B




vendredi 22 février 13
Algorithme de                                          .




                                Trouver le résultat le plus pertinent


                               PageRank    TrustRank & PersonRank



                 Entrée                                             Résultat
                   Recherche
                                                                        Liste de liens




vendredi 22 février 13
TrustRank


                         • 2004 : Développé par Yahoo!
                         • Algorithme de tri contre le spam
                         • Indice de confiance défini
                           par le moteur de recherche
                         • Note entre 0 et 1 ( 0=spam )

vendredi 22 février 13
PersonRank

                         • 2009 : Search Result Ranking Based On Trust
                         • Note de l’internaute
                         • Social Media Optimization
                         • Web sémantique




vendredi 22 février 13
vendredi 22 février 13
Sources
                            •   http://fr.wikipedia.org/wiki/PageRank

                            •   http://fr.wikipedia.org/wiki/Algorithme

                            •   http://fr.wikipedia.org/wiki/TrustRank

                            •   http://www.pagerank.fr/

                            •   http://www.youtube.com/watch?feature=player_embedded&v=KyCYyoGusqs#!

                            •   http://www.youtube.com/user/GoogleWebmasterHelp

                            •   http://blog.wmaker.net/Que-savons-nous-du-Google-PageRank_a601.html

                            •   http://www.commentcamarche.net/contents/web/referencement.php3#google-caffeine

                            •   http://www.opensiteexplorer.org/

                            •   http://www.laurentbourrelly.com/blog/321.php




                         Maude Trudeau

                         François Bernard-Sévigny




vendredi 22 février 13

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Introduction au PageRank

  • 1. PageRank Algorithme de Google vendredi 22 février 13
  • 2. Algorithme • Nom latinisé du mathématicien perse Al-Khawarizmi • « Un algorithme est une suite finie et non ambiguë d’opérations ou d’instruction permettant de résoudre un problème. »1 • Il y a des entrées, des instructions et des résultats • Algorithme mathématique et non mathématique • Formule d’exécution d’actions 1- http://fr.wikipedia.org/wiki/Algorithme vendredi 22 février 13
  • 3. Exemple d’algorithme Entrées Instructions Résultats + = vendredi 22 février 13
  • 4. Algorithme de . Trouver le résultat le plus pertinent PageRank Entrée Résultat Recherche Liste de liens vendredi 22 février 13
  • 5. Qu’est-ce que le PageRank? • Lary Page • Une page = une note • Note entre 0 et 10 (PR6) • Défini selon la valeur des liens entrants Lien A B Sortant Entrant vendredi 22 février 13
  • 6. Comment calculer le PageRank? Quantité Qualité A A A A A A B A A A A vendredi 22 février 13
  • 7. Comment calculer le PageRank? Quantité Qualité C B vendredi 22 février 13
  • 8. Algorithme de . Trouver le résultat le plus pertinent PageRank TrustRank & PersonRank Entrée Résultat Recherche Liste de liens vendredi 22 février 13
  • 9. TrustRank • 2004 : Développé par Yahoo! • Algorithme de tri contre le spam • Indice de confiance défini par le moteur de recherche • Note entre 0 et 1 ( 0=spam ) vendredi 22 février 13
  • 10. PersonRank • 2009 : Search Result Ranking Based On Trust • Note de l’internaute • Social Media Optimization • Web sémantique vendredi 22 février 13
  • 12. Sources • http://fr.wikipedia.org/wiki/PageRank • http://fr.wikipedia.org/wiki/Algorithme • http://fr.wikipedia.org/wiki/TrustRank • http://www.pagerank.fr/ • http://www.youtube.com/watch?feature=player_embedded&v=KyCYyoGusqs#! • http://www.youtube.com/user/GoogleWebmasterHelp • http://blog.wmaker.net/Que-savons-nous-du-Google-PageRank_a601.html • http://www.commentcamarche.net/contents/web/referencement.php3#google-caffeine • http://www.opensiteexplorer.org/ • http://www.laurentbourrelly.com/blog/321.php Maude Trudeau François Bernard-Sévigny vendredi 22 février 13