%0 Conference Proceedings %T Vector Space Interpolation for Query Expansion %A Ghosal, Deepanway %A Aditya, Somak %A Dandapat, Sandipan %A Choudhury, Monojit %Y He, Yulan %Y Ji, Heng %Y Li, Sujian %Y Liu, Yang %Y Chang, Chua-Hui %S Proceedings of the 2nd Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics and the 12th International Joint Conference on Natural Language Processing (Volume 2: Short Papers) %D 2022 %8 November %I Association for Computational Linguistics %C Online only %F ghosal-etal-2022-vector %X Topic-sensitive query set expansion is an important area of research that aims to improve search results for information retrieval. It is particularly crucial for queries related to sensitive and emerging topics. In this work, we describe a method for query set expansion about emerging topics using vector space interpolation. We use a transformer model called OPTIMUS, which is suitable for vector space manipulation due to its variational autoencoder nature. One of our proposed methods – Dirichlet interpolation shows promising results for query expansion. Our methods effectively generate new queries about the sensitive topic by incorporating set-level diversity, which is not captured by traditional sentence-level augmentation methods such as paraphrasing or back-translation. %U https://aclanthology.org/2022.aacl-short.50 %P 405-410