Haystack: the end-to-end NLP framework for pragmatic builders - Pietsch, Malte; Möller, Timo; Kostic, Bogdan; Risch, Julian; Pippi, Massimiliano; Jobanputra, Mayank; Zanzottera, Sara; Cerza, Silvano; Blagojevic, Vladimir; Stadelmann, Thomas; Soni, Tanay; Lee, Sebastian (2019)