Optimizing Photometric Redshift Training Sets I: Efficient Compression of the Galaxy Color-Redshift Relation with UMAP

arXiv:2512.09032 · astro-ph.GA · Submitted 2025-12-09 · Read on arXiv

astro-ph.GA

Submitted: 2025-12-09

Updated: 2026-09-10

Code: https://github.com/finianashmead/UMAP

Project page: https://finianashmead.github.io/#umap-cosmos2020-video

Terminology

• Embeddings — 14× in this paper · explained in 2 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Calibration — 1× in this paper · explained in 7 episodes
• Curse of Dimensionality — 1× in this paper · explained in 6 episodes
• Robustness — 1× in this paper · explained in 5 episodes
• Rubin Legacy Survey of Space and Time — 1× in this paper
• Trace — 1× in this paper · explained in 2 episodes
• Weak Lensing — 1× in this paper · explained in 2 episodes

Sources

• COSMOS Spectroscopic Redshift Compilation (First Data Release): 488k Redshifts Encompassing Two Decades of Spectroscopy
• The LSST Dark Energy Science Collaboration (DESC) Science Requirements Document
• Roman Observations Time Allocation Committee: Final Report and Recommendations

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