具有密集稀疏短语索引的实时开放域QA ，亮相 BibTeX： inproceedings{denspi, title={Real-Time Open-Domain Question Answering with Dense-Sparse Phrase Index}, author={Seo, Minjoon and Lee, Jinhyuk and Kwiatkowski, Tom and Parikh, Ankur P and Farhadi, Ali and Hajishirzi