tailieunhanh - Báo cáo khoa học: "Mixed Initiative in Dialogue: An Investigation into Discourse Segmentation"

Conversation between two people is usually of MIXED-INITIATIVE, with CONTROL over the conversation being transferred from one person to another. We apply a set of rules for the transfer of control to 4 sets of dialogues consisting of a total of 1862 turns. The application of the control rules lets us derive domain-independent discourse structures. The derived structures indicate that initiative plays a role in the structuring of discourse. In order to explore the relationship of control and initiative to discourse processes like centering, we analyze the distribution of four different classes of anaphora for two data sets. . | Mixed Initiative in Dialogue An Investigation into Discourse Segmentation Marilyn Walker University of Pennsylvania Computer Science Dept. Philadelphia PA 19104 lyn@ Steve Whittaker Hewlett Packard Laboratories Bristol England BS12 6QZ fe HP Stanford Science Center sjw@. com Abstract Conversation between two people is usually of Mixed-Initiative with Control over the conversation being transferred from one person to another. We apply a set of rules for the transfer of control to 4 sets of dialogues consisting of a total of 1862 turns. The application of the control rules lets us derive domain-independent discourse structures. The derived structures indicate that initiative plays a role in the structuring of discourse. In order to explore the relationship of control and initiative to discourse processes like centering we analyze the distribution of four different classes of anaphora for two data sets. This distribution indicates that some control segments are hierarchically related to others. The analysis suggests that discourse participants often mutually agree to a change of topic. We also compared initiative in Task Oriented and Advice Giving dialogues and found that both allocation of control and the manner in which control is transferred is radically different for the two dialogue types. These differences can be explained in terms of collaborative planning principles. 1 Introduction Conversation between two people has a number of characteristics that have yet to be modeled adequately in human-computer dialogue. Conversation is Bidirectional there is a two way flow of information between participants. Information This research was partially funded by ARO grants DAAG29-84-K-0061 and DAAL03-89-C0031PRI DARPA grant N00014-85-K001ST and NSF grant MCS-82-19196 at the University of Pennsylvania J and by Hewlett Packard is exchanged by Mixed-Initiative. Each participant will on occasion take the conversational lead. Conversational .