@INPROCEEDINGS { AUTHOR = "Ayme Arango and Jorge P{\'e}rez and B{\'a}rbara Poblete", TITLE = "Hate Speech Detection is not as Easy as you May Think: A Closer Look at Model Validation", BOOKTITLE = "42th Annual International ACM Conference on Research and Development in Information Retrieval (SIGIR)", PAGES = "45-54", MONTH = "Jul", YEAR = "2019", ADDRESS = "Paris, France", PUBLISHER = "ACM Press", }