Set up Future Backend

A utility function that aims to streamline the set up of the required future backend with sensible defaults for most users of regional_epinow(). More advanced users are recommended to setup their own {future} backend based on their available resources. Running this requires the {future} package to be installed.

Usage

setup_future(
  data,
  strategies = c("multisession", "multisession"),
  min_cores_per_worker = 4
)

Arguments

data

A <data.frame> of confirmed cases (confirm) by date (date), and region (region).

strategies

A vector length 1 to 2 of strategies to pass to future::plan(). Nesting of parallelisation is from the top level down. The default is to set up nesting parallelisation with both using future::multisession() (future::multicore() will likely be a faster option on supported platforms). For single level parallelisation use a single strategy or future::plan() directly. See future::plan() for options.

min_cores_per_worker

Numeric, the minimum number of cores per worker. Defaults to 4 which assumes 4 MCMC chains are in use per region.

Value

Numeric number of cores to use per worker. If greater than 1 pass to stan_args = list(cores = "output from setup future") or use future = TRUE. If only a single strategy is used then nothing is returned.