Linear Cross-Lingual Mapping of Sentence Embeddings
Oleg Vasilyev Fumika Isono John Bohannon
Semantics of a sentence is defined with much less ambiguity than semantics of
a single word, and it should be better preserved by translation to another
language. If multilingual sentence embeddings intend to represent sentence
semantics, then the similarity between embeddings of any two sentences must be
invariant with respect to translation. Based on this suggestion, we consider a
simple linear cross-lingual mapping as a possible improvement of the
multilingual embeddings. We also consider deviation from orthogonality
conditions as a measure of deficiency of the embeddings.