文本间语义相关性计算及其应用研究
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摘要
在信息飞速膨胀的当今世界,文本由于其表达灵活、信息容量大以及最为关键的人性化特点,一直是信息传播和存储的主要形式。如何对浩如烟海的文本数据进行处理,帮助人们更好地管理和使用这些数据,是如今这个信息时代需要研究和解决的根本问题之一。而对文本之间的关系进行考查,将这些纷杂的文本依据它们的内容进行合理的关联和区分,从而使更加复杂和深入的后续处理能够被顺畅的应用,则成为文本信息处理的首要内容。
     长期以来,由于计算机领域的研究者们缺乏对相关性概念的深入思考,使得在文本间关系的考察中,以相似性度量代替相关性度量的方法长期占据主流地位。尽管在一些情况下,相似性度量能够在一定程度上模拟相关性度量。但是,在很多着重强调考察文本之间关联程度而非相似程度的应用当中,由于此类方法的出发点与应用的关注目标之间存在偏差,因此往往不能很好的满足应用对计算效果的要求。
     本文借助认知科学与信息科学等多个领域的研究者对相关概念的实质所进行的深入分析,在现有的技术条件下,对用户的一般性知识基础加以利用,在语义层面上通过对系统角度的相关性计算模式进行改进,使之向用户角度的相关性计算靠近,对人类的相关判断行为进行模拟。针对语句和文档这两种不同规模和级别的文本,本文对它们的相关性计算方法分别进行了研究,并探讨了它们各自在相关领域中的应用。具体内容包括以下几个方面。
     面向自动问答系统中候选答案语句抽取的任务,提出了基于系统相似理论的加强型系统相似模型,用以对问答系统中用户查询问句与候选文档问句之间的关系进行计算。该模型引入候选答案要素,赋予其相应的模拟相似度,使其对语句之间相似度产生正向贡献,进而实现相似性度量到相关性度量的转变,更加准确地满足问答系统的需求。以该语句相关性计算方法为主要创新点的问答系统在目前国际权威的问答系统评测中获得了优异的评测成绩,同时,在此评测数据集上针对该方法的测试结果也体现了该方法性能的优越性。
     除了对语句一级的文本间语义相关性计算方法进行研究,本文对文档之间的相关性度量也提出了新的计算方法。利用文档所具有的词汇集聚特性,借助语义辞典等知识源,本文对文档中词语间的语义链接关系进行了定义与考察,并以之为基础提出了文档的词汇链形式化表示、词汇链权重计算,以及相应的文档匹配等方法。在对人类相关性判断行为的特点进行分析的基础上,提出了利用文本分类对相关性计算效果进行考察的评价方法。实验证明,基于词汇集聚的文档相关性计算方法取得了良好的计算效果。
     在此基础之上,本文提出了可调节距离的词汇间链接关系定义方法,并且对文档词汇集聚所形成的词簇的内部结构做了进一步的分析,提出了对词簇结构信息加以利用的基于结构化词汇集聚的文档相关性计算方法。在相关实验中,该计算方法的优越性得到了充分的证实。
     此外,面向药物开发过程中,药代动力学模型训练所需的相关参数缺乏的问题,本文对基于词汇集聚的文本相关性计算方法在生物医药领域药代动力学参数相关文档过滤中的应用进行了研究,同时包括了系统的结构设计以及针对应用领域的特点所采取的特殊的文本预处理方法。在针对酶作用物、引物和抑制剂三个类别的8种药物的实验中,以基于词汇集聚的文本相关性计算方法为核心的文本过滤系统取得了良好的计算效果,对提高生物医药领域药品开发过程的效率具有非常重大的实际意义。
In the world with enormous information, text is the important format for information distributing and storage, for its flexibility, capability and convenience. How to process the masses of text data so that they can be managed and made use of efficiently is one of the fundamental problems of this age. And in text processing, measuring the relationship between the texts and making the chaotic texts into clusters according to their content so that the detailed following process can be applied on them is a paramount problem.
     For a long time, since lacking of deep discussing on the connotation of the concept of“relevant”, researchers of computer science always use the text similarity calculating instead of the text relevance calculating in texts relationships measuring. But this approximate method with inexplicit incentive can not satisfy the requirements of the applications emphasizing“relevant”.
     In this paper, based on the analysis of the“relevant”concept offered by the researchers from both of the cognize and information science, the system oriented relevance calculating mode is improved at the semantic level. It takes advantages of general knowledge of the users, and makes the system oriented relevance calculating mode moved towards the user oriented mode in order to simulate the human relevant judgments. For two sub-types of texts, sentences and documents, we do research on the relationships measuring of them respectively. And the corresponding applications of them are also discussed. The detailed content of this paper includes:
     An improved system similarity model based on the system similarity theory for sentences retrieval in Question-Answering system is proposed. It makes the latent answer elements contribute to the text similarity degree through offering respective simulated similar parameter. In this way, it changes the similarity calculating model into the relevance calculating model, and satisfies the requirement the Question-Answering system. The system which takes this processing as the main character achieved excellent result in the authoritative international test and the further evaluation of this method on this test data also confirms its effectivity.
     Besides the calculation between sentences, a novel relevant calculating method between documents is proposed. Based on the lexical cohension theory, and with the help of knowledge resources, we detect the semantic relationship between words, and propose a document representation method based on lexical chain, a lexical chain weight calculating method and a respective documents matching method. Depending on the analysis of the features of human relevant judgments, we proposed an evaluating method for document relevant calculation through documents classification. The test results show that the lexical cohension based method works successfully.
     Further more, we present a distance flexible method for the detection of words semantic relationship. And through analyzing the inner structure of lexical cohension, we present a document relevant calculating method based on lexical cohension with structure information. And the advantage of this method is proved in the experiments.
     To support the training of the pharmacokinetics model in new drug development, we do research on the application of text filtering. The filter system gets the papers about pharmacokinetics parameters by applying document relevant calculation based on lexical cohension. The structure of it and the special text pre-processing for this special field are also described. In the evaluation for 8 drugs of 3 classes, substrate, inducer and inhibitor, it is indicated the filtering system which takes the document relevance calculating method based on lexical cohension as the central processing step gets excellent results. It makes significant effort in improving the efficiency of the drug development.
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