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To help them complete their search, search engine usually provide query suggestions. A good query suggestion system requires to model user behavior during the search session. In this article, we study multiple Transformer architectures applied to the query suggestion task and compare them with recurrent neural network (RNN)-based models. We experiment Transformer models with different tokenizers, with different Encoders (large pretrained models or fully trained ones), and with two kinds of architectures (flat or hierarchic). We study the performance and the behaviors of these various models, and observe that Transformer-based models outperform RNN-based ones. We show that while the hierarchical architectures exhibit very good performances for query suggestion, the flat models are more suitable for complex and long search tasks. Finally, we investigate the flat models behavior and demonstrate that they indeed learn to recover the hierarchy of a search session.<\/jats:p>","DOI":"10.1145\/3470562","type":"journal-article","created":{"date-parts":[[2021,10,16]],"date-time":"2021-10-16T00:30:25Z","timestamp":1634344225000},"page":"1-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["On the Study of Transformers for Query Suggestion"],"prefix":"10.1145","volume":"40","author":[{"given":"Agn\u00e8s","family":"Mustar","sequence":"first","affiliation":[{"name":"Sorbonne Universit\u00e9, CNRS, Paris, France"}]},{"given":"Sylvain","family":"Lamprier","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9, CNRS, Paris, France"}]},{"given":"Benjamin","family":"Piwowarski","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9, CNRS, Paris, France"}]}],"member":"320","published-online":{"date-parts":[[2021,10,15]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"Proceedings of the International Conference on Learning Representations.","author":"Ahmad Wasi Uddin","year":"2018","unstructured":"Wasi Uddin Ahmad , Kai-Wei Chang , and Hongning Wang . 2018 . 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