gpytorch.settings.variational_cholesky_jitter can be set dynamically. #2255
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Previously, this context manager was only used when VariationalStrategy modules were initialized. With this change,
gpytorch.settings.variational_cholesky_jitter will dynamically change the jitter value (for variational models already in use), unless the user specifies a
jitter_val
in the VariationalStrategy constructor.In addition, this PR adds type hintsd to a majority of the VariationalStrategy modules.
[Fixes #2244]