Poster
in
Workshop: NeurIPS 2024 Workshop: Machine Learning and the Physical Sciences
Emulation and Assessment of Gradient-Based Samplers in Cosmology
Arrykrishna Mootoovaloo · David Alonso · Jaime Ruiz-Zapatero · Carlos Garcia-Garcia
Abstract:
We assess gradient-based samplers like the No-U-Turn Sampler () compared to traditional Metropolis-Hastings algorithms in tomographic point analyses using DES Year 1 data and a simulated LSST-like survey. These studies involve 20 and 32 nuisance parameters, respectively. We implement a differentiable forward model using and derive parameter constraints using and Metropolis-Hastings algorithms. shows a relative efficiency gain of in terms of effective samples per likelihood evaluation but only a factor of in terms of computational time due to the higher gradient computation cost. We validate these results with analytical multivariate distributions, concluding that can be beneficial for sampling high-dimensional parameter spaces in Cosmology, though the efficiency gain is modest for moderate dimensions ().
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