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luas builds Gaussian processes (GPs) primarily for two-dimensional data sets. It uses different optimizations to make the application of GPs to 2D data sets possible within a reasonable timeframe. The code is implemented using Jax (ascl:2111.002), which helps calculate derivatives of the log-likelihood as well as permitting the code to be easily run on either CPU or GPU. luas can be used with popular inference frameworks such as NumPyro and PyMC. The package makes it easier to account for systematics correlated across two dimensions in data sets, in addition to being helpful for any other applications (e.g., interpolation).