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构造并行化系统交互环境的若干关键技术   总被引:4,自引:0,他引:4       下载免费PDF全文
杨博  王鼎兴  郑纬民 《软件学报》2001,12(5):698-705
交互式并行化系统通过提供友好的交互功能并引入用户知识来协助程序的并行化,是解决自动并行化能力不足的一条有效途径.描述了一个并行化系统交互环境TIPSIE(interactive en vironment of Tsinghua interactive parallelizing system),并就构造该环境的性能预测、增量编译和数据相关查询等关键技术进行了讨论.实验结果表明,这些技术能够有效地提高系统的并行化能力和效率.  相似文献
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We present a statistical method called Covering Topic Score (CTS) to predict query performance for information retrieval. Estimation is based on how well the topic of a user's query is covered by documents retrieved from a certain retrieval system. Our approach is conceptually simple and intuitive, and can be easily extended to incorporate features beyond bag- of-words such as phrases and proximity of terms. Experiments demonstrate that CTS significantly correlates with query performance in a variety of TREC test collections, and in particular CTS gains more prediction power benefiting from features of phrases and proximity of terms. We compare CTS with previous state-of-the-art methods for query performance prediction including clarity score and robustness score. Our experimental results show that CTS consistently performs better than, or at least as well as, these other methods. In addition to its high effectiveness, CTS is also shown to have very low computational complexity, meaning that it can be practical for real applications.  相似文献
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郎 皓  王 斌  李锦涛  丁 凡 《软件学报》2008,19(2):291-300
目前,查询性能预测(predicting query performance,简称PQP)已经被认为是检索系统最重要的功能之一.近几年的研究和实验表明,PQP技术在文本检索领域有着广阔的发展前景和拓展空间.对文本检索中的PQP进行综述,重点论述其主要方法和关键技术.首先介绍了常用的实验语料和评价体系;然后介绍了影响查询性能的各方面因素;之后,按照基于检索前和检索后的分类体系概述了目前主要的PQP方法;简介了PQP在几个方面的应用;最后讨论了PQP所面临的一些挑战.  相似文献
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