SG01 at the NTCIR-13 STC-2 Task

We describe how we build the system for NTCIR-13 Short Text Conversation (STC) Chinese subtask. In our system, we use the retrieval-based method and the generationbased method respectively. For the retrieval-based method, we develop several features to match the candidates and then apply a learning to rank algorithm to get properly ranked results. For the generation-based method, we first generate various high-quality comments and then do ranking to select better ones. As reported in the task overview, we have achieved top performance in both methods with three submissions for the retrieval-based method and five submissions for the generation-based method.