As for the composition of the training set, we drew both on the “impostors method” (see Koppel / Winter 2014) and on historiographical research. Following (Juola 2015), we fixed the number of “impostors” to a minimum of three: Franz Blei, Franz Kafka, and Stefan Zweig. Subsequently, we selected three authors suggested by (Urbaner 2001) as possible TSZ collaborators: Marie delle Grazie, Hugo Salus, and Albert Ritter (his texts were not available in digitized format, so we OCRed and manually refined them). The training set was then completed by a selection of articles published by Musil in various journals between 1911 and 1919. For each author, the retrieved material was subdivided in three text chunks with a length comprised between 6,000 and 8,000 words: the training set was thus composed by 21 text chunks (see Figure 2).