Refinement of Unsupervised Cross-Lingual Word Embeddings
Table 1: Bilingual Lexicon Induction results. Precision at k=1 (P@k x 100%) performance for Spanish (ES), German (DE) and Finnish (FI), where English (EN) is a source language.
['[EMPTY]', '[BOLD] EN-ES P@1', '[BOLD] EN-ES Δ', '[BOLD] EN-DE P@1', '[BOLD] EN-DE Δ', '[BOLD] EN-FI P@1', '[BOLD] EN-FI Δ']
The effectiveness of these orthogonal transformations falls drastically when the isomorphic condition does not hold. This problem can be observed for morphologically-rich or distant languages such as English and Japanese [sogaard2018limitations, fujinuma-etal-2019-resource], which in case of CLEs may be considered non-isomorphic language pairs [ zhang-etal-2019-girls]. We follow the standard evaluation procedure by measuring scores for Precision at 1 (P@1), which determines how many times one of the correct translations of a source word is retrieved as the nearest neighbor of the source word in the target language.