Search Results for author: Emmanouil Theodosis

Found 8 papers, 1 papers with code

Matrix Factorization in Tropical and Mixed Tropical-Linear Algebras

no code implementations25 Sep 2023 Ioannis Kordonis, Emmanouil Theodosis, George Retsinas, Petros Maragos

Matrix Factorization (MF) has found numerous applications in Machine Learning and Data Mining, including collaborative filtering recommendation systems, dimensionality reduction, data visualization, and community detection.

Collaborative Filtering Community Detection +3

Learning Linear Groups in Neural Networks

no code implementations29 May 2023 Emmanouil Theodosis, Karim Helwani, Demba Ba

Employing equivariance in neural networks leads to greater parameter efficiency and improved generalization performance through the encoding of domain knowledge in the architecture; however, the majority of existing approaches require an a priori specification of the desired symmetries.

Learning unfolded networks with a cyclic group structure

1 code implementation16 Nov 2022 Emmanouil Theodosis, Demba Ba

Deep neural networks lack straightforward ways to incorporate domain knowledge and are notoriously considered black boxes.

Data Augmentation Rotated MNIST

On the convergence of group-sparse autoencoders

no code implementations13 Feb 2021 Emmanouil Theodosis, Bahareh Tolooshams, Pranay Tankala, Abiy Tasissa, Demba Ba

Recent approaches in the theoretical analysis of model-based deep learning architectures have studied the convergence of gradient descent in shallow ReLU networks that arise from generative models whose hidden layers are sparse.

Clustering

Towards improving discriminative reconstruction via simultaneous dense and sparse coding

no code implementations16 Jun 2020 Abiy Tasissa, Emmanouil Theodosis, Bahareh Tolooshams, Demba Ba

We propose a novel dense and sparse coding model that integrates both representation capability and discriminative features.

Compressive Sensing Dictionary Learning

Tropical Geometry and Piecewise-Linear Approximation of Curves and Surfaces on Weighted Lattices

no code implementations9 Dec 2019 Petros Maragos, Emmanouil Theodosis

Tropical Geometry and Mathematical Morphology share the same max-plus and min-plus semiring arithmetic and matrix algebra.

regression

Tropical Modeling of Weighted Transducer Algorithms on Graphs

no code implementations1 Nov 2018 Emmanouil Theodosis, Petros Maragos

Weighted Finite State Transducers (WFSTs) are versatile data structures that can model a great number of problems, ranging from Automatic Speech Recognition to DNA sequencing.

Automatic Speech Recognition Automatic Speech Recognition (ASR) +1

An Adaptive Pruning Algorithm for Spoofing Localisation Based on Tropical Geometry

no code implementations1 Nov 2018 Emmanouil Theodosis, Petros Maragos

In particular, the proposed algorithm tries to localise the attacker by adapting the leniency parameter based on estimates about the state of the solution space.

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