string: For the autoencoder, evaluation can only be conducted on←, for which scores should generally strongly decrease when adding the GRL.
  Word Mover’s Distance (WMD) To assess the word embedding distance of the obfuscated sentence to the original, we take the Word Mover’s Distance (WMD) (Kusner et al., 2015), based on the English fastText embeddings for Wikipedia (Bojanowski et al., 2016).