Hierarchical Multi-Label Dialog Act Recognition on Spanish Data
Table 3: Level 2 and Level 3 label distributions. The English translation of each label is in brackets.
['[BOLD] Level 2  [BOLD] Label', '[BOLD] Level 2  [BOLD] User', '[BOLD] Level 2  [BOLD] System', '[BOLD] Level 2  [BOLD] Total', '[BOLD] Level 2  [BOLD] %', '[BOLD] Level 3  [BOLD] Label', '[BOLD] Level 3  [BOLD] User', '[BOLD] Level 3  [BOLD] System', '[BOLD] Level 3  [BOLD] Total', '[BOLD] Level 3  [BOLD] %']
We can see that there are 10 common labels and three additional ones on Level 3 — Order Number, Number of Trains, and Trip Type. Furthermore, both levels have the Nil label, which represents the absence of label in that level. In this sense, we can see that only 63% of the segments have Level 2 labels, and that the percentage is even lower, 52%, when considering Level 3 labels. This is mainly due to the fact that segments labeled as Opening, Closing, Undefined, Not Understood, Waiting, and New Consult on the first level cannot have labels on the remaining levels. Finally, it is important to refer that while each segment may only have one Level 1 label, it may have multiple Level 2 and Level 3 labels.