Gap-weighted subsequences for automatic cognate identification and phylogenetic inference
Table 8: QD and GQD for the top performing models in subfamily experiment.
['Classifier', 'QD', 'GQD']
The winning classifiers are subsequence classifiers: p=3 and HK+2. We compare the winning classifiers against HK classifier. distance matrices based on equations defined above. In order to see the effect of tree inference algorithm, we also report the difference between the tree inferred from gold standard cognate judgments (Oracle tree) and the gold standard tree given by expert historical linguists. Both trees misplace Ossetic as an outlier in the Indo-Iranian branch whereas, it should have been placed together with Iranian branch. The HK+2 (binary) tree places Byelorussian correctly whereas HK (binary) tree misplaces it. Italian’s position is correctly determined in HK+2 (binary) tree whereas HK tree misplaces it. Overall, the difference between the top-two trees is not large.