what is a null transitions in a hidden markov model? what are they used for? viverbi how can i model null transition what is the threshold model of viterbi? what is a null transition in viterbi what is the threshold model viterbi what is the threshold model in ferrbi? what is a null transition how to use a null transition threshold model does viterbi use a null transition in a hidden markov model what is hmm threshold what is the threshold of the viterbi algorithm what is hmm threshold model used for what is threshold model for viterbi is there a null transition in the threshold model? why use null transitions viverbi model for gesture recognition what model uses null transitions why is hmm null transitions useful what is hmm threshold model what model is used for null transition