Mark SpectralMixtureKernel as stationary
@@ -65,6 +65,8 @@ class SpectralMixtureKernel(Kernel):
https://arxiv.org/pdf/1302.4245.pdf
"""
+ is_stationary = True # kernel is stationary even though it does not have a lengthscale
+
def __init__(
self,
num_mixtures=None,
