In this model, the generative process involves: (1) three subjectivity labels for sentences (i.e., sentence expresses subjective opinions as being positive/negative, or states facts as being objective); (2) a sentiment label for each word in the sentence (either positive, negative, or neutral), and (3) the words in the sentences.
the formal definition of the subjLDA generative process is as follows: In practice, it is quite intuitive that one classifies a sentence as subjective if it contains one or more strongly subjective clues (Riloff and Wiebe, 2003).