2023/01/18 by Ahmad Mehrabi, Mehrabi, Ahmad · 1 citation
Chemistry · Computer Science · Engineering · #Astrophysics of Galaxies (astro-ph.GA) #Control Systems and Identification #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gaussian Processes and Bayesian Inference #Spectroscopy and Chemometric Analyses
paper · pdf · doi:10.48550/arxiv.2301.07369
openalex publication_date 2023/01/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A model-independent or non-parametric approach for modeling a database has been widely used in cosmology. In these scenarios, the data has been used directly to reconstruct an underlying function. In this work, we introduce a novel semi-model-independent method to do the task. The new approach not only removes some drawbacks of previous methods but also has some remarkable advantages. We combine the well-known Gaussian linear model with a neural network and introduce a procedure for the reconstruction of an arbitrary function. In the scenario, the neural network produces some arbitrary base functions which subsequently are fed to the Gaussian linear model. Given a prior distribution on the free parameters, the Gaussian linear model provides a close form for the posterior distribution as well as the Bayesian evidence. In addition, contrary to other methods, it is straightforward to compute the uncertainty.