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Consider changing default behavior of pathfinder num_paths=1 #1248

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@WardBrian

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@WardBrian

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

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