what is the difference between observational and hidden data why is an event hidden from the training model why is it called the semiobservable data hidden variable training definition how can you make a model semi-observable what is it called when the data is not observed are variables unobservable? what type of model can be trained by observing can the model be trained by observing a training instance what is a hidden variable and how can it be trained can hmm models be trained when an observable data can be trained using expected-maximization criterion, the model must include why is observed data called semiobservable what's a hidden variable in hmm what is hidden variable mean which of the following is an example of an observable markov model? what is the model of observable variable what is the difference between observed and unobservable data in nlp? what is meant by hidden variable what is observable data