Very, depending on what you’re doing. They allow rich probabilistic models useful in scene recognition (CRFs), HMMs are hugely useful in state detection, Bayes Nets are used (amongst a ton of other things) Decision Analysis. Bishop’s ML book is full of them.
How useful are PGMs? (I’m taking the ML class right now and I only want to spend a whole semester on PGMs if they’re worth that much attention.)
Very, depending on what you’re doing. They allow rich probabilistic models useful in scene recognition (CRFs), HMMs are hugely useful in state detection, Bayes Nets are used (amongst a ton of other things) Decision Analysis. Bishop’s ML book is full of them.