22 Mai 2015 adminFrumam – Cédric Beny (Perimeter Institute/University of Hanover) : Dimensionality reduction from coarse-grained Fisher metricCarte non disponible Date/heure Date(s) - 22/05/201514 h 00 min - 15 h 00 min Catégories Pas de Catégories Title : Dimensionality reduction from coarse-grained Fisher metric\n\nAbstract : In physics, one is often interested in describing only the large-scale\nproperties of complex statistical states. Renormalisation is the\nproblem of finding the most relevant variables for that purpose. I\nwill show how a method developed in that context can be used for the\ndimensional reduction of abstract data. The approach yields a “PCA\nkernel” whose diagonalisation amounts to finding the perturbations of\nthe empirical distribution whose distinguishability is least affected\nby a certain noise model (coarse-graining). This approach is invariant\nunder arbitrary changes of coordinates. The kernel, however, requires\nthe calculation of a partition function which must be approximated. I\npresent two numerical examples.[
22 Mai 2015 adminFrumam – Cédric Beny (Perimeter Institute/University of Hanover) : Dimensionality reduction from coarse-grained Fisher metricCarte non disponible Date/heure Date(s) - 22/05/201514 h 00 min - 15 h 00 min Catégories Pas de Catégories Title : Dimensionality reduction from coarse-grained Fisher metric\n\nAbstract : In physics, one is often interested in describing only the large-scale\nproperties of complex statistical states. Renormalisation is the\nproblem of finding the most relevant variables for that purpose. I\nwill show how a method developed in that context can be used for the\ndimensional reduction of abstract data. The approach yields a “PCA\nkernel” whose diagonalisation amounts to finding the perturbations of\nthe empirical distribution whose distinguishability is least affected\nby a certain noise model (coarse-graining). This approach is invariant\nunder arbitrary changes of coordinates. The kernel, however, requires\nthe calculation of a partition function which must be approximated. I\npresent two numerical examples.[
