Combining multiple end-to-end speech recognition models based on density ratio approach. - Keigo Hojo; Daiki Mori; Yukoh Wakabayashi; Kengo Ohta; Atsunori Ogawa; Norihide Kitaoka (APSIPA ASC, 2023)

Boosting CTC-based ASR using inter-layer attention-based CTC loss. - Keigo Hojo; Yukoh Wakabayashi; Kengo Ohta; Atsunori Ogawa; Norihide Kitaoka (INTERSPEECH, 2024)

Discrete Speech Unit Extraction via Independent Component Analysis. - Tomohiko Nakamura; Kwanghee Choi; Keigo Hojo; Yoshiaki Bando; Satoru Fukayama; Shinji Watanabe 001 (ICASSP Workshops, 2025)