course, there exist many CRFs much more sophisti-
cated that the linear-chain CRF considered in the pa-
per. Let us cite some recent papers (Siddiqi, 2021;
Song et al., 2019; Quattoni et al., 2007; Kumar et al.,
2003; Saa and C¸ etin, 2012), among others. Compar-
ing different sophisticated CRFs to different PMCs
and TMCs will undoubtedly be an interesting second
perspective.
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