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We present ANNz2, a new implementation of the public software for photometric redshift (photo-z) estimation of Collister and Lahav (2004), which now includes generation of full probability distribution functions (PDFs). ANNz2 utilizes…

Cosmology and Nongalactic Astrophysics · Physics 2016-08-24 Iftach Sadeh , Filipe B. Abdalla , Ofer Lahav

We describe the redmonster automated redshift measurement and spectral classification software designed for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV). We describe the…

Deep metric learning is an important area due to its applicability to many domains such as image retrieval and person re-identification. The main drawback of such models is the necessity for labeled data. In this work, we propose to…

Computer Vision and Pattern Recognition · Computer Science 2019-11-19 Xuefei Cao , Bor-Chun Chen , Ser-Nam Lim

We present photometric redshifts for an uniquely large and deep sample of 522286 objects with i'_{AB}<25 in the Canada-France Legacy Survey ``Deep Survey'' fields, which cover a total effective area of 3.2 deg^2. We use 3241 spectroscopic…

We present a data-driven method to infer the redshift distribution of an arbitrary dataset based on spatial cross-correlation with a reference population and we apply it to various datasets across the electromagnetic spectrum to show its…

Cosmology and Nongalactic Astrophysics · Physics 2014-07-31 Brice Ménard , Ryan Scranton , Samuel Schmidt , Chris Morrison , Donghui Jeong , Tamas Budavari , Mubdi Rahman

In state-of-the-art deep learning for object recognition, SoftMax and Sigmoid functions are most commonly employed as the predictor outputs. Such layers often produce overconfident predictions rather than proper probabilistic scores, which…

Computer Vision and Pattern Recognition · Computer Science 2022-05-13 Gledson Melotti , Cristiano Premebida , Jordan J. Bird , Diego R. Faria , Nuno Gonçalves

We propose a Multimodal Machine Learning method for estimating the Photometric Redshifts of quasars (PhotoRedshift-MML for short), which has long been the subject of many investigations. Our method includes two main models, i.e. the feature…

Astrophysics of Galaxies · Physics 2022-11-09 Shuxin Hong , Zhiqiang Zou , A-Li Luo , Xiao Kong , Wenyu Yang , Yanli Chen

Accurate photometric redshifts are a lynchpin for many future experiments to pin down the cosmological model and for studies of galaxy evolution. In this study, a novel sparse regression framework for photometric redshift estimation is…

Instrumentation and Methods for Astrophysics · Physics 2025-06-03 Ibrahim A. Almosallam , Sam N. Lindsay , Matt J. Jarvis , Stephen J. Roberts

Machine learning (ML)-based cyber-physical systems (CPSs) have been extensively developed to improve the print quality of additive manufacturing (AM). However, the reproducibility of these systems, as presented in published research, has…

Computational Engineering, Finance, and Science · Computer Science 2024-10-23 Jiarui Xie , Mutahar Safdar , Andrei Mircea , Bi Cheng Zhao , Yan Lu , Hyunwoong Ko , Zhuo Yang , Yaoyao Fiona Zhao

Photometric redshifts (photo-$z$s) are an essential tool for galaxy evolution science with JWST. However, for deep surveys with more limited filter sets (i.e. $N_{\text{filt}} \sim6$) such as large pure parallel surveys, the most commonly…

Astrophysics of Galaxies · Physics 2025-11-07 Kenneth J. Duncan

We demonstrate the use of automatic Bayesian inference for the analysis of LISA data sets. In particular we describe a new automatic Reversible Jump Markov Chain Monte Carlo method to evaluate the posterior probability density functions of…

General Relativity and Quantum Cosmology · Physics 2009-11-11 Alexander Stroeer , Jonathan Gair , Alberto Vecchio

Estimation of small failure probabilities is one of the most important and challenging computational problems in reliability engineering. The failure probability is usually given by an integral over a high-dimensional uncertain parameter…

Computation · Statistics 2011-10-18 Konstantin M. Zuev , James L. Beck , Siu-Kui Au , Lambros S. Katafygiotis

Existing point cloud semantic segmentation networks cannot identify unknown classes and update their knowledge, due to a closed-set and static perspective of the real world, which would induce the intelligent agent to make bad decisions. To…

Computer Vision and Pattern Recognition · Computer Science 2024-07-24 Jinfeng Xu , Siyuan Yang , Xianzhi Li , Yuan Tang , Yixue Hao , Long Hu , Min Chen

The analysis of weak gravitational lensing in wide-field imaging surveys is considered to be a major cosmological probe of dark energy. Our capacity to constrain the dark energy equation of state relies on the accurate knowledge of the…

Cosmology and Nongalactic Astrophysics · Physics 2021-03-24 Euclid Collaboration , O. Ilbert , S. de la Torre , N. Martinet , A. H. Wright , S. Paltani , C. Laigle , I. Davidzon , E. Jullo , H. Hildebrandt , D. C. Masters , A. Amara , C. J. Conselice , S. Andreon , N. Auricchio , R. Azzollini , C. Baccigalupi , A. Balaguera-Antolínez , M. Baldi , A. Balestra , S. Bardelli , R. Bender , A. Biviano , C. Bodendorf , D. Bonino , S. Borgani , A. Boucaud , E. Bozzo , E. Branchini , M. Brescia , C. Burigana , R. Cabanac , S. Camera , V. Capobianco , A. Cappi , C. Carbone , J. Carretero , C. S. Carvalho , S. Casas , F. J. Castander , M. Castellano , G. Castignani , S. Cavuoti , A. Cimatti , R. Cledassou , C. Colodro-Conde , G. Congedo , L. Conversi , Y. Copin , L. Corcione , A. Costille , J. Coupon , H. M. Courtois , M. Cropper , J. Cuby , A. Da Silva , H. Degaudenzi , D. Di Ferdinando , F. Dubath , C. Duncan , X. Dupac , S. Dusini , A. Ealet , M. Fabricius , S. Farrens , P. G. Ferreira , F. Finelli , P. Fosalba , S. Fotopoulou , E. Franceschi , P. Franzetti , S. Galeotta , B. Garilli , W. Gillard , B. Gillis , C. Giocoli , G. Gozaliasl , J. Graciá-Carpio , F. Grupp , L. Guzzo , S. V. H. Haugan , W. Holmes , F. Hormuth , K. Jahnke , E. Keihanen , S. Kermiche , A. Kiessling , C. C. Kirkpatrick , M. Kunz , H. Kurki-Suonio , S. Ligori , P. B. Lilje , I. Lloro , D. Maino , E. Maiorano , O. Marggraf , K. Markovic , F. Marulli , R. Massey , M. Maturi , N. Mauri , S. Maurogordato , H. J. McCracken , E. Medinaceli , S. Mei , R. Benton Metcalf , M. Moresco , B. Morin , L. Moscardini , E. Munari , R. Nakajima , C. Neissner , S. Niemi , J. Nightingale , C. Padilla , F. Pasian , L. Patrizii , K. Pedersen , R. Pello , V. Pettorino , S. Pires , G. Polenta , M. Poncet , L. Popa , D. Potter , L. Pozzetti , F. Raison , A. Renzi , J. Rhodes , G. Riccio , E. Romelli , M. Roncarelli , E. Rossetti , R. Saglia , A. G. Sánchez , D. Sapone , P. Schneider , T. Schrabback , V. Scottez , A. Secroun , G. Seidel , S. Serrano , C. Sirignano , G. Sirri , L. Stanco , F. Sureau , P. Tallada Crespí , M. Tenti , H. I. Teplitz , I. Tereno , R. Toledo-Moreo , F. Torradeflot , A. Tramacere , E. A. Valentijn , L. Valenziano , J. Valiviita , T. Vassallo , Y. Wang , N. Welikala , J. Weller , L. Whittaker , A. Zacchei , G. Zamorani , J. Zoubian , E. Zucca

In a companion paper, we proposed combining large numbers of "fuzzy archetypes" with Self-Organizing Maps (SOMs) to derive photometric redshifts in a data-driven way. In this paper, we investigate the performance of several sampling…

Cosmology and Nongalactic Astrophysics · Physics 2015-10-29 Joshua S. Speagle , Daniel J. Eisenstein

A new approach to estimating photometric redshifts - using Artificial Neural Networks (ANNs) - is investigated. Unlike the standard template-fitting photometric redshift technique, a large spectroscopically-identified training set is…

Astrophysics · Physics 2009-11-07 Andrew E. Firth , Ofer Lahav , Rachel S. Somerville

This paper revisits classical works of Rauch (1963, et al. 1965) and develops a novel method for maximum likelihood (ML) smoothing estimation from incomplete information/data of stochastic state-space systems. Score function and conditional…

Methodology · Statistics 2023-03-30 Budhi Arta Surya

Reading analysis can give important information about a user's confidence and habits and can be used to construct feedback to improve a user's reading behavior. A lack of labeled data inhibits the effective application of fully-supervised…

Human-Computer Interaction · Computer Science 2020-12-08 Md. Rabiul Islam , Shuji Sakamoto , Yoshihiro Yamada , Andrew Vargo , Motoi Iwata , Masakazu Iwamura , Koichi Kise

We describe a new method for measuring the true redshift distribution of any set of objects studied only photometrically. The angular cross-correlation between objects in a photometric sample with objects in some spectroscopic sample as a…

Astrophysics · Physics 2009-11-13 Jeffrey A. Newman

We present an unsupervised machine learning approach that can be employed for estimating photometric redshifts. The proposed method is based on a vector quantization approach called Self--Organizing Mapping (SOM). A variety of…

Instrumentation and Methods for Astrophysics · Physics 2015-06-03 M. J. Way , C. D. Klose
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