Pix2Prof: fast extraction of sequential information from galaxy imagery via a deep natural language 'captioning' model

Abstract

We present 'Pix2Prof', a deep learning model that can eliminate any manual steps taken when extracting galaxy profiles. We argue that a galaxy profile of any sort is conceptually similar to a natural language image caption. This idea allows us to leverage image captioning methods from the field of natural language processing, and so we design Pix2Prof as a float sequence 'captioning' model suitable for galaxy profile inference. We demonstrate the technique by approximating a galaxy surface brightness (SB) profile fitting method that contains several manual steps. Pix2Prof processes $\sim$1 image per second on an Intel Xeon E5 2650 v3 CPU, improving on the speed of the manual interactive method by more than two orders of magnitude. Crucially, Pix2Prof requires no manual interaction, and since galaxy profile estimation is an embarrassingly parallel problem, we can further increase the throughput by running many Pix2Prof instances simultaneously. In perspective, Pix2Prof would take under an hour to infer profiles for $10^5$ galaxies on a single NVIDIA DGX-2 system. A single human expert would take approximately two years to complete the same task. Automated methodology such as this will accelerate the analysis of the next generation of large area sky surveys expected to yield hundreds of millions of targets. In such instances, all manual approaches -- even those involving a large number of experts -- will be impractical.

arXiv commentAccepted for publication in MNRAS. 10 pages, and 8 figures. Code: https://github.com/Smith42/pix2prof

References in corpus (20)

• The Sloan Digital Sky Survey: Technical Summary
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The physical properties of star forming galaxies in the low redshift universe
• Detailed Structural Decomposition of Galaxy Images
• The Optical and Near-Infrared Properties of Galaxies: I. Luminosity and Stellar Mass Functions
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• The size distribution of galaxies in the Sloan Digital Sky Survey
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The properties and luminosity function of extremely low luminosity galaxies
• Colors, magnitudes and velocity dispersions in early-type galaxies: Implications for galaxy ages and metallicities
• A physically motivated definition for the size of galaxies in an era of ultra-deep imaging
• Deep learning for galaxy surface brightness profile fitting
• An Investigation of Sloan Digital Sky Survey Imaging Data and Multi-Band Scaling Relations of Spiral Galaxies (with Dynamical Information)
• The stellar mass-size relation for the most isolated galaxies in the local Universe
• AstroVaDEr: Astronomical Variational Deep Embedder for Unsupervised Morphological Classification of Galaxies and Synthetic Image Generation
• An Extensive Photometric Catalog of CALIFA Galaxies
• Evolutionary stellar population synthesis at 2A spectral resolution

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• GAlaxy Light profile convolutional neural NETworks (GaLNets). I. fast and accurate structural parameters for billion galaxy samples
• AstroPhot: Fitting Everything Everywhere All at Once in Astronomical Images
• MaNGA galaxy properties -- I. An extensive optical, mid-infrared photometric, and environmental catalogue
• The effect of spiral arms on the Sérsic photometry of galaxies