In the first DSTC, the user's goal was almost always fixed throughout the dialog. In the second DSTC, the user's goal changed in about 40 percent of dialogs.
In spoken dialog systems, dialog state tracking refers to the task of correctly inferring the user's goal at a given turn, given all of the dialog history up to that turn.
In the core of a conversation system is a key component called a dialog state tracker, which estimates the user's goal given all of the dialog history so far.
Historically dialog state tracking has been done with hand-crafted rules.
The dialog state tracking challenge studies this problem as a corpus-based task.
"We created an easy-to-use portal that can be personalized to meet the unique needs of each user," said Betty Jo Hibberd, Dialog's information professional market manager.
Customization and personalization have definitely become essential functions for any Web product or service, and Dialog has been trying to keep pace with the Web environment.
While the press release doesn't mention it, the Info Pro Portal joins several other portals available from Dialog: Dialog Business (http://www.dialog.com/business), Dialog Science (http://www.dialog.com/science), Dialog Technology (http://www.dialog.com/technology), and PowerPortal (actually Open Access to DialogSelect; see the Oct.
There are three zones of information in Dialog Info Pro.