Towards Better UD Parsing: Deep Contextualized Word Embeddings, Ensemble, and Treebank Concatenation
Table 4: Cross-lingual concatenation results. The results for ug_udt and uk_iu are obtained on the development set. The results for ga_idt and sme_giella are obtained with udpipe by 5-fold cross validation.
['ug_udt', 'ug_udt  [BOLD] 69.27', 'uk_iu', 'uk_iu 88.84', 'ga_idt', 'ga_idt  [BOLD] 62.84', 'sme_giella', 'sme_giella  [BOLD] 66.33']
Unfortunately, concatenating treebanks from different languages only achieves improved performance on uk_iu. This results also indicate that in cross lingual parsing, sophisticated methods like word embeddings transfer Guo et al. Guo et al.