no code implementations • 6 Jun 2023 • Piotr Zwiernik
Another approach considers linear restrictions on the matrix logarithm of the covariance matrix.
no code implementations • 10 Feb 2021 • Marta Casanellas, Marina Garrote-López, Piotr Zwiernik
Consider the problem of learning undirected graphical models on trees from corrupted data.
no code implementations • 22 Jun 2019 • Gábor Lugosi, Jakub Truszkowski, Vasiliki Velona, Piotr Zwiernik
We study the problem of recovering the structure underlying large Gaussian graphical models or, more generally, partial correlation graphs.
no code implementations • 2 Aug 2017 • Piotr Zwiernik
Latent tree models are graphical models defined on trees, in which only a subset of variables is observed.
no code implementations • 29 Dec 2014 • Mathias Drton, Shaowei Lin, Luca Weihs, Piotr Zwiernik
We clarify how in this case real log-canonical thresholds can be computed using polyhedral geometry, and we show how to apply the general theory to the Laplace integrals associated with Gaussian latent tree and forest models.