When pathfinder was first being exposed, it was decided that num_paths=1 would run single-path pathfinder. This was at the time the only way to turn off PSIS resampling.
Now that we have the argument psis_resample, we could do this another way, but that requires changing the default. In todays Stan The Gathering, @avehtari @mitzimorris and @bob-carpenter all voted in favor of making this change
When pathfinder was first being exposed, it was decided that num_paths=1 would run single-path pathfinder. This was at the time the only way to turn off PSIS resampling.
Now that we have the argument psis_resample, we could do this another way, but that requires changing the default. In todays Stan The Gathering, @avehtari @mitzimorris and @bob-carpenter all voted in favor of making this change