Open-domain question answering (OpenQA) is one of the most challenging yet widely investigated problems in natural language processing. It aims at building a system that can answer any given question from large-scale unstructured text or structured knowledge-base. To solve this problem. researchers traditionally use information retrieval methods to retrieve the most relevant documents... https://www.spidertattooz.com/USC-Trojans-9FIFTY-Snapback-Hat/