Overview of the NTCIR-10 INTENT-2 Task

This paper provides an overview of the NTCIR-10 INTENT-2 task (the second INTENT task), which comprises the Subtopic Mining and the Document Ranking subtasks. INTENT-2 attracted participating teams from China, France, Japan and South Korea – 12 teams for Subtopic Mining and 4 teams for Document Ranking (including an organisers’ team). The Subtopic Mining subtask received 34 English runs, 23 Chinese runs and 14 Japanese runs; the Document Ranking subtask received 12 Chinese runs and 8 Japanese runs. We describe the subtasks, data and evaluation methods, and then report on the official results, as well as the revised results for Subtopic Mining.