sentence1: having done that , we map the resulting monolingual embeddings to a cross-lingual space using the unsupervised mode in vecmap 1 , which builds an initial solution based on heuristics and iteratively improves it through self-learning .
sentence2: for that purpose , we extend the skip-gram model to simultaneously learn word and phrase embeddings , and map them to a cross-lingual space adapting previous unsupervised techniques .