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Improving Accuracy of Quasars' Photometric Redshift Estimation by Integration of KNN and SVM

Published online by Cambridge University Press:  27 October 2016

Bo Han
Affiliation:
International School of Software, Wuhan University, Wuhan, P.R.China email: [email protected]; [email protected]
Hongpeng Ding
Affiliation:
International School of Software, Wuhan University, Wuhan, P.R.China email: [email protected]; [email protected]
Yanxia Zhang
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012, Beijing, P.R.China
Yongheng Zhao
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012, Beijing, P.R.China
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Abstract

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Catastrophic failure is an unsolved problem existing in the most photometric redshift estimation approaches for a long history. In this study, we propose a novel approach by integration of k-nearest-neighbor (KNN) and support vector machine (SVM) methods together. Experiments based on the quasar sample from SDSS show that the fusion approach can significantly mitigate catastrophic failure and improve the accuracy of photometric redshift estimation.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016