Run one round of the round-robin protocol — run_round

Backend-agnostic via the decrypt() generic, but part of the frozen Paillier-era legacy surface: the random-offset chain idiom compensated for Paillier-era trust assumptions, and it encrypts each site's value at the master, which the supported topology deliberately does not. The supported pattern is master_aggregate().

Usage

run_round_robin(master, theta)

Arguments

master: a Master, wired to a chain via round_robin_chain().
theta: the current parameter value (passed through to each worker's contribution_fn).

Value

the aggregated value, or NA_real_ on failure.

Details

The master generates a random real offset, encrypts it under its public key, and sends it around the chain. Each worker site adds its encrypted local summary to the running total and forwards. On return, the master decrypts the running total, subtracts the offset in the clear, and returns the resulting scalar.

If any worker's contribution_fn returns NA, the chain stops and this function returns NA_real_.