Multivariate variational autoencoder
| dc.authorid | 0000-0003-1677-9496 | |
| dc.contributor.author | Yavuz, Mehmet Can | en_US |
| dc.date.accessioned | 2026-05-05T13:15:04Z | |
| dc.date.available | 2026-05-05T13:15:04Z | |
| dc.date.issued | 2025-11-08 | |
| dc.department | Işık Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Bilgisayar Mühendisliği Bölümü | en_US |
| dc.department | Işık University, Faculty of Engineering and Natural Sciences, Department of Computer Engineering | en_US |
| dc.description.abstract | Learning latent representations that are simultaneously expressive, geometrically well-structured, and reliably calibrated remains a central challenge for Variational Autoencoders (VAEs). Standard VAEs typically assume a diagonal Gaussian posterior, which simplifies optimization but rules out correlated uncertainty and often yields entangled or redundant latent dimensions. We introduce the Multivariate Variational Autoencoder (MVAE), a tractable full-covariance extension of the VAE that augments the encoder with sample-specific diagonal scales and a global coupling matrix. This induces a multivariate Gaussian posterior of the form N (µϕ(x), C diag(σ2ϕ(x))C⊤), enabling correlated latent factors while preserving a closedform KL divergence and a simple reparameterization path. Beyond likelihood, we propose a multi-criterion evaluation protocol that jointly assesses reconstruction quality (MSE, ELBO), downstream discrimination (linear probes), probabilistic calibration (NLL, Brier, ECE), and unsupervised structure (NMI, ARI). Across Larochelle-style MNIST variants, Fashion-MNIST, and CIFAR-10/100, MVAE consistently matches or outperforms diagonal-covariance VAEs of comparable capacity, with particularly notable gains in calibration and clustering metrics at both low and high latent dimensions. Qualitative analyses further show smoother, more semantically coherent latent traversals and sharper reconstructions. All code, dataset splits, and evaluation utilities are released to facilitate reproducible comparison and future extensions of multivariate posterior models. | en_US |
| dc.identifier.citation | Yavuz, M. C. (2025). Multivariate variational autoencoder. Arxiv, 1-10. doi: https://doi.org/10.48550/arXiv.2511.07472 | en_US |
| dc.identifier.endpage | 10 | |
| dc.identifier.startpage | 1 | |
| dc.identifier.uri | https://hdl.handle.net/11729/7377 | |
| dc.identifier.uri | https://doi.org/10.48550/arXiv.2511.07472 | |
| dc.identifier.wos | PPRN:161694573 | |
| dc.identifier.wosquality | N/A | |
| dc.indekslendigikaynak | Web of Science | en_US |
| dc.indekslendigikaynak | Preprint Citation Index | en_US |
| dc.institutionauthor | Yavuz, Mehmet Can | en_US |
| dc.institutionauthorid | 0000-0003-1677-9496 | |
| dc.language.iso | en | en_US |
| dc.publisher | Cornell Univ | en_US |
| dc.relation.ispartof | Arxiv | en_US |
| dc.relation.publicationcategory | Ön Baskı – Uluslararası – Kurum Öğretim Elemanı | en_US |
| dc.rights | info:eu-repo/semantics/openAccess | en_US |
| dc.subject | Multivariate | en_US |
| dc.subject | Variational autoencoder | en_US |
| dc.subject | FullCovariance posterior | en_US |
| dc.subject | Latent correlation modeling | en_US |
| dc.subject | Representation learning | en_US |
| dc.title | Multivariate variational autoencoder | en_US |
| dc.type | Preprint | en_US |
| dspace.entity.type | Publication | en_US |
