Search Results for author: Antonietta Mira

Found 13 papers, 6 papers with code

Federated Learning for Non-factorizable Models using Deep Generative Prior Approximations

no code implementations25 May 2024 Conor Hassan, Joshua J Bon, Elizaveta Semenova, Antonietta Mira, Kerrie Mengersen

We demonstrate the SIGMA prior's effectiveness on synthetic data and showcase its utility in a real-world example of FL for spatial data, using a conditional autoregressive prior to model spatial dependence across Australia.

Decision Making Epidemiology +2

Beyond the noise: intrinsic dimension estimation with optimal neighbourhood identification

no code implementations24 May 2024 Antonio Di Noia, Iuri Macocco, Aldo Glielmo, Alessandro Laio, Antonietta Mira

The Intrinsic Dimension (ID) is a key concept in unsupervised learning and feature selection, as it is a lower bound to the number of variables which are necessary to describe a system.

feature selection

Scalable Vertical Federated Learning via Data Augmentation and Amortized Inference

no code implementations7 May 2024 Conor Hassan, Matthew Sutton, Antonietta Mira, Kerrie Mengersen

Vertical federated learning (VFL) has emerged as a paradigm for collaborative model estimation across multiple clients, each holding a distinct set of covariates.

Bayesian Inference Data Augmentation +3

On the intrinsic dimensionality of Covid-19 data: a global perspective

no code implementations8 Mar 2022 Abhishek Varghese, Edgar Santos-Fernandez, Francesco Denti, Antonietta Mira, Kerrie Mengersen

This paper aims to develop a global perspective of the complexity of the relationship between the standardised per-capita growth rate of Covid-19 cases, deaths, and the OxCGRT Covid-19 Stringency Index, a measure describing a country's stringency of lockdown policies.

Learning Summary Statistics for Bayesian Inference with Autoencoders

1 code implementation28 Jan 2022 Carlo Albert, Simone Ulzega, Firat Ozdemir, Fernando Perez-Cruz, Antonietta Mira

For stochastic models with intractable likelihood functions, approximate Bayesian computation offers a way of approximating the true posterior through repeated comparisons of observations with simulated model outputs in terms of a small set of summary statistics.

Bayesian Inference Decoder

A Common Atom Model for the Bayesian Nonparametric Analysis of Nested Data

1 code implementation17 Aug 2020 Francesco Denti, Federico Camerlenghi, Michele Guindani, Antonietta Mira

The use of high-dimensional data for targeted therapeutic interventions requires new ways to characterize the heterogeneity observed across subgroups of a specific population.

Methodology Applications

Data segmentation based on the local intrinsic dimension

1 code implementation27 Feb 2019 Michele Allegra, Elena Facco, Francesco Denti, Alessandro Laio, Antonietta Mira

Here we develop a robust approach to discriminate regions with different local IDs and segment the points accordingly.

Clustering General Classification

Regularized Zero-Variance Control Variates

1 code implementation13 Nov 2018 Leah F. South, Antonietta Mira, Christopher Drovandi

Zero-variance control variates (ZV-CV) are a post-processing method to reduce the variance of Monte Carlo estimators of expectations using the derivatives of the log target.

Computation Methodology

Fast Maximum Likelihood estimation via Equilibrium Expectation for Large Network Data

2 code implementations28 Feb 2018 Maksym Byshkin, Alex Stivala, Antonietta Mira, Garry Robins, Alessandro Lomi

We demonstrate the performance of the EE algorithm in the context of exponential random graphmodels (ERGMs) a family of statistical models commonly used in empirical research based on network data observed at a single period in time.

ABCpy: A High-Performance Computing Perspective to Approximate Bayesian Computation

1 code implementation13 Nov 2017 Ritabrata Dutta, Marcel Schoengens, Lorenzo Pacchiardi, Avinash Ummadisingu, Nicole Widmer, Jukka-Pekka Onnela, Antonietta Mira

Further, ABCpy enables ABC experts to easily develop new inference schemes and evaluate them in a standardized environment and to extend the library with new algorithms.

Computation

Bayesian Inference of Spreading Processes on Networks

no code implementations26 Sep 2017 Ritabrata Dutta, Antonietta Mira, Jukka-Pekka Onnela

Although the underlying processes of transmission are different, the network approach can be used to study the spread of pathogens in a contact network or the spread of rumors in an online social network.

Bayesian Inference

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