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'exoplanet': Gradient-based probabilistic inference for exoplanet data & other astronomical time series. - Daniel Foreman-Mackey; Rodrigo Luger; Eric Agol; Thomas Barclay; Luke G. Bouma; Timothy D. Brandt; Ian Czekala; Trevor J. David; Jiayin Dong; Emily A. Gilbert; Tyler A. Gordon; Christina Hedges; et al. (J. Open Source Softw., 2021)