Search Results for author: Andrei Patrascu

Found 6 papers, 2 papers with code

Complexity of Inexact Proximal Point Algorithm for minimizing convex functions with Holderian Growth

1 code implementation10 Aug 2021 Andrei Patrascu, Paul Irofti

Several decades ago the Proximal Point Algorithm (PPA) started to gain a long-lasting attraction for both abstract operator theory and numerical optimization communities.

Stochastic proximal splitting algorithm for composite minimization

1 code implementation4 Dec 2019 Andrei Patrascu, Paul Irofti

In the large-scale or noisy contexts, when only stochastic information on the smooth part of the objective function is available, the extension of proximal gradient schemes to stochastic oracles is based on proximal tractability of the nonsmooth component and it has been deeply analyzed in the literature.

Quick survey of graph-based fraud detection methods

no code implementations24 Oct 2019 Paul Irofti, Andrei Patrascu, Andra Baltoiu

In general, anomaly detection is the problem of distinguishing between normal data samples with well defined patterns or signatures and those that do not conform to the expected profiles.

Anomaly Detection Fraud Detection

Community-Level Anomaly Detection for Anti-Money Laundering

no code implementations24 Oct 2019 Andra Baltoiu, Andrei Patrascu, Paul Irofti

Anomaly detection in networks often boils down to identifying an underlying graph structure on which the abnormal occurrence rests on.

Anomaly Detection Dictionary Learning +1

New nonasymptotic convergence rates of stochastic proximal pointalgorithm for convex optimization problems

no code implementations22 Jan 2019 Andrei Patrascu

Inspired by the scalability of alternating projection methods, we start from the (linear) regularity assumption, typically used in convex feasiblity problems to guarantee the linear convergence of stochastic alternating projection methods, and analyze a general weak linear regularity condition which facilitates convergence rate boosts in stochastic proximal point schemes.

Stochastic Optimization

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