I see. I didn’t modify the distances data, but I wonder if it’s either because:
- I’m using the covariance matrix instead of the Cholesky decomposition, or
- I’m not calculating the covariance matrix correctly (I’m doing it manually, based on what I saw from the PyMC source code… It’s highly likely that I made some mistake while trying to interpret it
).
Could you show me how you’re then using the decomposition to build the GP?