LearningMatch: Siamese Neural Network Learns the Match Manifold

Abstract

The match, which is defined as the the similarity between two waveform templates, is a fundamental calculation in computationally expensive gravitational-wave data-analysis pipelines, such as template bank generation. In this paper we introduce LearningMatch, a Siamese neural network that has learned the mapping between the parameters, specifically $\hat{I}{»}_0$ (which is proportional to the chirp mass), $\hat{I}\cdot$ (symmetric mass ratio), and equal aligned spin ($\ddot{I}{‡}_1$ = $\ddot{I}{‡}_2$), of two gravitational-wave templates and the match. The trained Siamese neural network, called LearningMatch, can predict the match to within $3.3\%$ of the actual match value. For match values greater than 0.95, a trained LearningMatch model can predict the match to within $1\%$ of the actual match value. LearningMatch can predict the match in 20 $\hat{I}¼$s (mean maximum value) with Graphical Processing Units (GPUs). LearningMatch is 3 orders of magnitudes faster at determining the match than current standard mathematical calculations that involve the template being generated.