EmotionX-AR: CNN-DCNN autoencoder based Emotion Classifier Sopan Khosla author 2018-07 text Proceedings of the Sixth International Workshop on Natural Language Processing for Social Media Lun-Wei Ku editor Cheng-Te Li editor Association for Computational Linguistics Melbourne, Australia conference publication khosla-2018-emotionx 10.18653/v1/W18-3507 https://aclanthology.org/W18-3507/ 2018-07 37 44