In other words, we do not investigate the document-level coherence of stego text because this requires sophisticated knowledge of natural language semantics and pragmatics which we consider to be outside the scope of this work.
the human annotation data comprises 2,010 sentences selected from the English Internet Corpus (Sharoff 2006), and consists of 201 target words: nouns, verbs, adjectives, and adverbs, each with ten sentences containing that word.