Bayesian inference is, to be overly simple, a way to write probabilistic if-statements and fit them from data. The "if" statement in this case is "if the bug is there...", and of course it's often the case that in actual software that if statement is probabilistic in nature. This thing does git bisect with a flaky bug with bayesian inference handling the flakiness to get you a decent estimate of where the bug is in the git history. It seems to be usable, or at least as usable as a Show HN thingy is expected to be.