  This paper introduces the Seventh Dialog System Technology Challenges (DSTC),
which use shared datasets to explore the problem of building dialog systems.
Recently, end-to-end dialog modeling approaches have been applied to various
dialog tasks. The seventh DSTC (DSTC7) focuses on developing technologies
related to end-to-end dialog systems for (1) sentence selection, (2) sentence
generation and (3) audio visual scene aware dialog. This paper summarizes the
overall setup and results of DSTC7, including detailed descriptions of the
different tracks and provided datasets. We also describe overall trends in the
submitted systems and the key results. Each track introduced new datasets and
participants achieved impressive results using state-of-the-art end-to-end
technologies.
