Search Results for author: Dimitrios Katselis

Found 5 papers, 0 papers with code

A Provably Improved Algorithm for Crowdsourcing with Hard and Easy Tasks

no code implementations14 Feb 2023 Seo Taek Kong, Saptarshi Mandal, Dimitrios Katselis, R. Srikant

After separating tasks by type, any Dawid-Skene algorithm (i. e., any algorithm designed for the Dawid-Skene model) can be applied independently to each type to infer the truth values.

Vocal Bursts Type Prediction

On the Consistency of Maximum Likelihood Estimators for Causal Network Identification

no code implementations17 Oct 2020 Xiaotian Xie, Dimitrios Katselis, Carolyn L. Beck, R. Srikant

Incoming edges to a node in the graph indicate that the state of the node at a particular time instant is influenced by the states of the corresponding parental nodes in the previous time instant.

Mixing Times and Structural Inference for Bernoulli Autoregressive Processes

no code implementations19 Dec 2016 Dimitrios Katselis, Carolyn L. Beck, R. Srikant

For a network with $p$ nodes, where each node has in-degree at most $d$ and corresponds to a scalar Bernoulli process generated by a BAR, we provide a greedy algorithm that can efficiently learn the structure of the underlying directed graph with a sample complexity proportional to the mixing time of the BAR process.

Time Series Analysis

A MAP approach for $\ell_q$-norm regularized sparse parameter estimation using the EM algorithm

no code implementations5 Aug 2015 Rodrigo Carvajal, Juan C. Agüero, Boris I. Godoy, Dimitrios Katselis

In this paper, Bayesian parameter estimation through the consideration of the Maximum A Posteriori (MAP) criterion is revisited under the prism of the Expectation-Maximization (EM) algorithm.

Estimator Selection: End-Performance Metric Aspects

no code implementations26 Jul 2015 Dimitrios Katselis, Cristian R. Rojas, Carolyn L. Beck

The separation of the system estimator from the experiment design is done within this new framework by choosing and fixing the estimation method to either a maximum likelihood (ML) approach or a Bayesian estimator such as the minimum mean square error (MMSE).

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