Aria Nourbakhsh


pdf bib
Toward Dialogue Modeling: A Semantic Annotation Scheme for Questions and Answers
María Andrea Cruz Blandón | Gosse Minnema | Aria Nourbakhsh | Maria Boritchev | Maxime Amblard
Proceedings of the 13th Linguistic Annotation Workshop

The present study proposes an annotation scheme for classifying the content and discourse contribution of question-answer pairs. We propose detailed guidelines for using the scheme and apply them to dialogues in English, Spanish, and Dutch. Finally, we report on initial machine learning experiments for automatic annotation.

pdf bib
sthruggle at SemEval-2019 Task 5: An Ensemble Approach to Hate Speech Detection
Aria Nourbakhsh | Frida Vermeer | Gijs Wiltvank | Rob van der Goot
Proceedings of the 13th International Workshop on Semantic Evaluation

In this paper, we present our approach to detection of hate speech against women and immigrants in tweets for our participation in the SemEval-2019 Task 5. We trained an SVM and an RF classifier using character bi- and trigram features and a BiLSTM pre-initialized with external word embeddings. We combined the predictions of the SVM, RF and BiLSTM in two different ensemble models. The first was a majority vote of the binary values, and the second used the average of the confidence scores. For development, we got the highest accuracy (75%) by the final ensemble model with majority voting. For testing, all models scored substantially lower and the scores between the classifiers varied more. We believe that these large differences between the higher accuracies in the development phase and the lower accuracies we obtained in the testing phase have partly to do with differences between the training, development and testing data.