SBC backend using the
optimizing method from
SBC_backend_rstan_optimizing(model, ..., n_retries_hessian = 1)
stanmodel object (created via
other arguments passed to
optimizing (number of iterations, ...).
data cannot be set this way as they need to be
controlled by the package.
the number of times the backend is allow to retry optimization (with different seeed) to produce a usable Hessian that can produce draws. In some cases, the Hessian may be numerically unstable and not be positive definite.