Search Results for author: Marcel Hirt

Found 6 papers, 4 papers with code

Learning multi-modal generative models with permutation-invariant encoders and tighter variational bounds

no code implementations1 Sep 2023 Marcel Hirt, Domenico Campolo, Victoria Leong, Juan-Pablo Ortega

In order to encode latent variables from different modality subsets, Product-of-Experts (PoE) or Mixture-of-Experts (MoE) aggregation schemes have been routinely used and shown to yield different trade-offs, for instance, regarding their generative quality or consistency across multiple modalities.

Learning variational autoencoders via MCMC speed measures

1 code implementation26 Aug 2023 Marcel Hirt, Vasileios Kreouzis, Petros Dellaportas

Variational autoencoders (VAEs) are popular likelihood-based generative models which can be efficiently trained by maximizing an Evidence Lower Bound (ELBO).

Reservoir Computing for Macroeconomic Forecasting with Mixed Frequency Data

1 code implementation1 Nov 2022 Giovanni Ballarin, Petros Dellaportas, Lyudmila Grigoryeva, Marcel Hirt, Sophie van Huellen, Juan-Pablo Ortega

Macroeconomic forecasting has recently started embracing techniques that can deal with large-scale datasets and series with unequal release periods.

Entropy-based adaptive Hamiltonian Monte Carlo

1 code implementation NeurIPS 2021 Marcel Hirt, Michalis K. Titsias, Petros Dellaportas

Hamiltonian Monte Carlo (HMC) is a popular Markov Chain Monte Carlo (MCMC) algorithm to sample from an unnormalized probability distribution.

Copula-like Variational Inference

1 code implementation NeurIPS 2019 Marcel Hirt, Petros Dellaportas, Alain Durmus

This family is based on new copula-like densities on the hypercube with non-uniform marginals which can be sampled efficiently, i. e. with a complexity linear in the dimension of state space.

Variational Inference

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