Classifier-dependent feature selection via greedy methods

F Camattari, S Guastavino, F Marchetti, M Piana… - Statistics and …, 2024 - Springer
The purpose of this study is to introduce a new approach to feature ranking for classification
tasks, called in what follows greedy feature selection. In statistical learning, feature selection …

Variation of the electron flux spectrum along a solar flare loop as inferred from STIX hard X-ray observations

A Volpara, P Massa, S Krucker, AG Emslie… - Astronomy & …, 2024 - aanda.org
Context. Regularized imaging spectroscopy was introduced for the construction of electron
flux images at different energies from count visibilities recorded by the Reuven Ramaty High …

Multi-scale CLEAN for Fourier-based hard x-ray solar imaging

A Volpara, M Catalano, M Piana… - Inverse Problems, 2024 - iopscience.iop.org
Multi-scale deconvolution is an ill-posed inverse problem in imaging, with applications
ranging from microscopy, through medical imaging, to astronomical remote sensing. In the …

Identifying synergies between VLBI and STIX imaging

H Müller, P Massa, A Mus, JS Kim… - Astronomy & …, 2024 - aanda.org
Context. Reconstructing an image from noisy, sparsely sampled Fourier data is an ill-posed
inverse problem that occurs in a variety of subjects within science, including data analysis …

Greedy feature selection: Classifier-dependent feature selection via greedy methods

F Camattari, S Guastavino, F Marchetti, M Piana… - arxiv preprint arxiv …, 2024 - arxiv.org
The purpose of this study is to introduce a new approach to feature ranking for classification
tasks, called in what follows greedy feature selection. In statistical learning, feature selection …

RIS: Regularized imaging spectroscopy for STIX on board Solar Orbiter

A Volpara, A Lupoli, F Filbir, E Perracchione… - Astronomy & …, 2025 - aanda.org
Context. The generation of spatially resolved count spectra and of cubes of count maps at
different energies via imaging spectroscopy is one of the main goals of solar hard X-ray …

Solar flares as electron accelerators: toward a resolution of the acceleration efficiency issue

A Volpara, P Massa, M Piana, AM Massone… - arxiv preprint arxiv …, 2025 - arxiv.org
A major open issue concerning the active Sun is the effectiveness with which magnetic
reconnection accelerates electrons in flares. A paper published by {\em {Nature}} in 2022 …

A recipe based on Lebesgue functions for learning Variably Scaled Kernels via Discontinuous Neural Networks ({\delta} NN-VSKs)

G Audone, F Della Santa, E Perracchione… - arxiv preprint arxiv …, 2024 - arxiv.org
The efficacy of interpolating via Variably Scaled Kernels (VSKs) is known to be dependent
on the definition of a proper scaling function, but no numerical recipes to construct it are …

AI-FLARES: Artificial Intelligence for the Analysis of Solar Flares Data

M Piana, F Benvenuto, AM Massone, C Campi… - arxiv preprint arxiv …, 2024 - arxiv.org
AI-FLARES (Artificial Intelligence for the Analysis of Solar Flares Data) is a research project
funded by the Agenzia Spaziale Italiana and by the Istituto Nazionale di Astrofisica within the …