Detection of Lexical Stress Errors in Non-Native (L2) English with Data Augmentation and Attention. - Daniel Korzekwa; Roberto Barra-Chicote; Szymon Zaporowski; Grzegorz Beringer; Jaime Lorenzo-Trueba; Alicja Serafinowicz; Jasha Droppo; Thomas Drugman; Bozena Kostek (Interspeech, 2021)