Tracking user-role evolution via topic modeling in community question answering     

Chaogang Fu 《Information processing & management》2019,56(6):102075

Community question answering (CQA) services that enable users to ask and answer questions are popular on the internet. Each user can simultaneously play the roles of asker and answerer. Some work has aimed to model the roles of users for potential applications in CQA. However, the dynamic characteristics of user roles have not been addressed. User roles vary over time. This paper explores user representation by tracking user-role evolution, which could enable several potential applications in CQA, such as question recommendation. We believe this paper is the first to track user-role evolution and investigate its influence on the performance of question recommendation in CQA. Moreover, we propose a time-aware role model (TRM) to effectively track user-role evolution. With different independence assumptions, two variants of TRM are developed. Finally, we present the TRM-based approach to question recommendation, which provides a mechanism to naturally integrate the user-role evolution with content relevance between the answerer and the question into a unified probabilistic framework. Experiments using real-world data from Stack Overflow show that (1) the TRM is valid for tracking user-role evolution, and (2) compared with baselines utilizing role based methods, our TRM-based approach consistently and significantly improves the performance of question recommendation. Hence, our approach could enable several potential applications in CQA.  相似文献   

反兴奋剂基础知识考试情况分析--以反兴奋剂教育准入试题为例     

王清  徐起麟  刘阳  高晓 《当代体育科技》2020,(3):252-254

近年来,兴奋剂问题逐渐成为我国体育行业的关键问题,兴奋剂问题的影响逐步扩大。为保证中国体育健儿干干净净参加比赛,需要建立长效教育机制,将反兴奋剂教育融入到训练、比赛及日常生活中去。本文通过对河北省2018年反兴奋剂基础知识轮训考试成绩进行汇总分析,发现反兴奋剂教育工作中的难点以及突出问题,并对今后教学工作提出探索性意见。  相似文献   

Boosting question answering over knowledge graph with reward integration and policy evaluation under weak supervision     

《Information processing & management》2023,60(2):103242

Among existing knowledge graph based question answering (KGQA) methods, relation supervision methods require labeled intermediate relations for stepwise reasoning. To avoid this enormous cost of labeling on large-scale knowledge graphs, weak supervision methods, which use only the answer entity to evaluate rewards as supervision, have been introduced. However, lacking intermediate supervision raises the issue of sparse rewards, which may result in two types of incorrect reasoning path: (1) incorrectly reasoned relations, even when the final answer entity may be correct; (2) correctly reasoned relations in a wrong order, which leads to an incorrect answer entity. To address these issues, this paper considers the multi-hop KGQA task as a Markov decision process, and proposes a model based on Reward Integration and Policy Evaluation (RIPE). In this model, an integrated reward function is designed to evaluate the reasoning process by leveraging both terminal and instant rewards. The intermediate supervision for each single reasoning hop is constructed with regard to both the fitness of the taken action and the evaluation of the unreasoned information remained in the updated question embeddings. In addition, to lead the agent to the answer entity along the correct reasoning path, an evaluation network is designed to evaluate the taken action in each hop. Extensive ablation studies and comparative experiments are conducted on four KGQA benchmark datasets. The results demonstrate that the proposed model outperforms the state-of-the-art approaches in terms of answering accuracy.  相似文献   

基于ASP的网上辅导答疑系统的设计   总被引：3，自引：0，他引：3  

郭雪峰  张世禄 《湖州师范学院学报》2005,27(2):119-122

对网上答疑系统进行了研究,设计了一种集人工答疑和自动答疑于一体的网上辅导答疑系统,指出了系统的特点和结构、主要功能模块、实现环境、部分数据库文件设计及关键技术实现.  相似文献   

基于布尔检索策略的问答系统性能研究     

王国金  康耀红 《科技广场》2005,(10):4-7

本文系统地研究和评价了问答系统（QA）中一系列可能的布尔检索策略。我们首先给出了两个评价指标：覆盖率和答案冗余度,它们被广泛的用于评价QA系统一些标准的排序检索系统的性能。其次我们考虑QA系统中的一些布尔检索策略,也就是如何从用户问题中产生布尔查询式并把与此查询相关的回答结果集返回给用户,然后评价查询的效果。本文的目的是理解如何产生更好的QA查询策略以及那些方法能更有效的实现这种策略。  相似文献   

出于效益还是约束?社会化问答社区用户持续答题意愿研究     

岳宇君  郦晓月 《情报杂志》2021,(3):175-181

[目的/意义]在社会化问答社区,如何留住用户,促进用户的持续答题一直是人们关注的焦点。[方法/过程]根据社会交换理论,构建社区涉入、群体规范、效益导向快速关系、约束导向快速关系、问答满意度及持续答题意愿之间的影响关系模型,通过调查问卷收集数据,利用SPSS和AMOS进行统计分析和假设检验。[结果/结论]研究结果表明,效益导向快速关系和约束导向快速关系对问答满意度、持续答题意愿都有显著的正向影响,问答满意度在“快速关系→问答满意度→持续答题意愿”路径中起部分中介作用,社区涉入和群体规范能够促进效益导向与约束导向快速关系的建立。  相似文献   

Improving graph-based random walks for complex question answering using syntactic,shallow semantic and extended string subsequence kernels     

Yllias Chali  Sadid A. Hasan  Shafiq R. Joty 《Information processing & management》2011

The task of answering complex questions requires inferencing and synthesizing information from multiple documents that can be seen as a kind of topic-oriented, informative multi-document summarization. In generic summarization the stochastic, graph-based random walk method to compute the relative importance of textual units (i.e. sentences) is proved to be very successful. However, the major limitation of the TF^*IDF approach is that it only retains the frequency of the words and does not take into account the sequence, syntactic and semantic information. This paper presents the impact of syntactic and semantic information in the graph-based random walk method for answering complex questions. Initially, we apply tree kernel functions to perform the similarity measures between sentences in the random walk framework. Then, we extend our work further to incorporate the Extended String Subsequence Kernel (ESSK) to perform the task in a similar manner. Experimental results show the effectiveness of the use of kernels to include the syntactic and semantic information for this task.  相似文献   

Automatic categorization of questions for user-interactive question answering     

Wanpeng Song  Liu Wenyin  Naijie Gu  Xiaojun Quan  Tianyong Hao 《Information processing & management》2011

Question categorization, which suggests one of a set of predefined categories to a user’s question according to the question’s topic or content, is a useful technique in user-interactive question answering systems. In this paper, we propose an automatic method for question categorization in a user-interactive question answering system. This method includes four steps: feature space construction, topic-wise words identification and weighting, semantic mapping, and similarity calculation. We firstly construct the feature space based on all accumulated questions and calculate the feature vector of each predefined category which contains certain accumulated questions. When a new question is posted, the semantic pattern of the question is used to identify and weigh the important words of the question. After that, the question is semantically mapped into the constructed feature space to enrich its representation. Finally, the similarity between the question and each category is calculated based on their feature vectors. The category with the highest similarity is assigned to the question. The experimental results show that our proposed method achieves good categorization precision and outperforms the traditional categorization methods on the selected test questions.  相似文献   

基于B/S模式的《计算机基础》试题库系统设计与实现     

杨晨霞  涂风涛 《科技广场》2010,(1):139-141

本文描述了一个基于B/S模式的《计算机基础》试题库系统的设计。该系统在结构上划分为表示层、业务逻辑层、数据存储层三个层次,实现了数据库存构建、试题库建立、试题录入、自动或手工组卷、试卷管理等功能。  相似文献   

信息熵在多项选择题质量分析中的应用     

杜鹏东  孙涛  田振清 《现代教育技术》2006,16(3):36-39

多项选择题是各种测试中使用的较为广泛的题型之一,施测后对题目各选项的有效性做出判断可为评价测试质量提供重要参考依据。本文由分析多项选择问题的信息熵入手,给出多项选择题等价选法个数d的计算公式。同时,对多项选择题之间的质量比较问题,给出了使用相对熵的比较方法。  相似文献