The paper I wrote about outlines a challenge for astronomers to produce the best code possible for estimating the local expansion rate of the universe (also called H0). Challengers will start with samples of gravitationally-lensed galaxies, and from those they’ll have to work out the H0 of each sample. Only the challenge creators know what the right answer is! The ultimate goal of this challenge is to create the best code possible ahead of LSST, which is going to produce an unimaginable amount of data during its 10-year run.
Go take a read, and let me know what you think!