Hotfix: fix .diagonal() calls for keops kernel matrices.
#2590
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[Fixes #2589]
Note to @jacobrgardner : as part of the 2.0 refactor where we remove
LazyEvaluatedKernelTensor, I want to add a method_symmetric_diagto all kernels that replaces thediag=Truemode of current kernels.When the kernel matrix isn't symmetric and we call diagonal (not sure if this ever happens in gpytorch, but technically we support it...) the best we can do is what we currently do in
KernelLinearOperator.diagonal.So this PR is more of a temporary hotfix that should cause any regressions in behavior, and I'll make sure diag is fast 2.0 with #2342