pymc-devs/pymc — pull request #301 by fonnesbeck (2013-06-26 22:29:07+00:00)
Title: Implemented stoppable tuning

Not sure how this slipped past, but until now step methods that tune kept tuning throughout sampling, with no opportunity for stopping. I've implemented a pretty simple way of doing so by having a `tuning` flag in the step method, and then a `tuning` argument in sample that takes an integer value for the number of steps to tune.