Non-isotropic length scales for graph-based Gaussian processes #97

Job	Run time
Package tests and linting (stan, 3.9)	11m 29s
Package tests and linting (stan, 3.10)	11m 6s
Package tests and linting (stan, 3.11)	11m 3s
Package tests and linting (torch, 3.9)	5m 11s
Package tests and linting (torch, 3.10)	5m 3s
Package tests and linting (torch, 3.11)	5m 21s
Package tests and linting (util, 3.9)	4m 19s
Package tests and linting (util, 3.10)	4m 12s
Package tests and linting (util, 3.11)	4m 50s
	1h 2m 34s

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