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I am following the tutorial Simple_MultiGPU_GP_Regression and I noticed that during the training two options were established:

    with gpytorch.beta_features.checkpoint_kernel(checkpoint_size), \
         gpytorch.settings.max_preconditioner_size(preconditioner_size):

What are or refer to the variables checkpoint_kernel and preconditioner_size?

I have check the documentation preconditioner_size but it is not quite clear to me what it refers to.

I intuit that checkpoint_size refers to something related to the number of training points associated with each GPU. But it is just an intuition.

Help is appreciated.

Thanks

BCJuan
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