I understand forward-backward (in general) pretty well and am not sure what application you’re thinking of or what you mean by “a path that’s impossible to happen”. Anyway, yes, I agree that you shouldn’t usually put 0 plausibility on views other than your current best guess.
I understand forward-backward (in general) pretty well and am not sure what application you’re thinking of or what you mean by “a path that’s impossible to happen”. Anyway, yes, I agree that you shouldn’t usually put 0 plausibility on views other than your current best guess.
It possible that you p=0 to go from 5:A to 6:B and the path created by forward-backward still goes from 5:A to 6:B.