Furthermore, because such models are both specific to the number of participants and to the order in which participant states are concatenated together, it is generally intractable to train them on material from other conversations.
the depicted perplexities are not unweighted averages over the whole meeting of duration t as in Equation 8, but over a 60second Hamming window centered on each t. the first trajectory, the dashed black line, is obtained when the entire meeting is used to estimate Θ CD , and is then scored by that same model (an "oracle" condition).