4 papers
The ReQAP System for Question Answering over Personal Information
Philipp Christmann, Gerhard Weikum
Personal information is abundant on users' devices, from structured data in calendar, shopping records or fitness tools, to unstructured contents in mail and social media posts. Th…
Recursive Question Understanding for Complex Question Answering over Heterogeneous Personal Data
Philipp Christmann, Gerhard Weikum
Question answering over mixed sources, like text and tables, has been advanced by verbalizing all contents and encoding it with a language model. A prominent case of such heterogen…
RAG-based Question Answering over Heterogeneous Data and Text
Philipp Christmann, Gerhard Weikum
This article presents the QUASAR system for question answering over unstructured text, structured tables, and knowledge graphs, with unified treatment of all sources. The system ad…
Faithful Temporal Question Answering over Heterogeneous Sources
Zhen Jia, Philipp Christmann, Gerhard Weikum
Temporal question answering (QA) involves time constraints, with phrases such as "... in 2019" or "... before COVID". In the former, time is an explicit condition, in the latter it…