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2012, International Journal of Computer Applications
Document clustering, one of the traditional data mining techniques, is an unsupervised learning paradigm where clustering methods try to identify inherent groupings of the text documents, so that a set of clusters is produced in which clusters exhibit high intra-cluster similarity and low intercluster similarity. The importance of document clustering emerges from the massive volumes of textual documents created. Although numerous document clustering methods have been extensively studied in these years, there still exist several challenges for increasing the clustering quality. Particularly, most of the current document clustering algorithms does not consider the semantic relationships which produce unsatisfactory clustering results. Since last three-four years efforts have been seen in applying semantics to document clustering. Here, an exhaustive and detailed review of more than thirty semantic driven document clustering methods is presented. After an introduction to the document clustering and its basic requirements for improvement, traditional algorithms are overviewed. Also, semantic similarity measures are explained. The article then discusses algorithms that make semantic interpretation of documents for clustering. The semantic approach applied, datasets used, evaluation parameters applied, limitations and future work of all these approaches is presented in tabular format for easy and quick interpretation.
Now the age of information technology, the textual document is spontaneously increasing over online or offline. In those articles contain Product information to a company profile. A lot of sources generate valuable information into text in the medical report, economic analysis, scientific journals, news, blog etc. Maintain and access those documents are very difficult without proper classification. Those problems can be overcome by proper document classification. Only a few documents are classified. All need classification and those are unsupervised. In this context clustering is the only solution. Traditional clustering technique and textual clustering have some difference. Relations between words are very imported to do clustering. Semantic clustering is proven as more appropriate clustering technique for texts. In this review paper, there has valuable information about clustering to semantic document clustering technique. In this paper, there has some information provided about advantage and disadvantage for various clustering methods.
International Journal of Advanced Computer Science and Applications, 2016
Document clustering is an unsupervised machine learning method that separates a large subject heterogeneous collection (Corpus) into smaller, more manageable, subject homogeneous collections (clusters). Traditional method of document clustering works around extracting textual features like: terms, sequences, and phrases from documents. These features are independent of each other and do not cater meaning behind these word in the clustering process. In order to perform semantic viable clustering, we believe that the problem of document clustering has two main components: (1) to represent the document in such a form that it inherently captures semantics of the text. This may also help to reduce dimensionality of the document and (2) to define a similarity measure based on the lexical, syntactic and semantic features such that it assigns higher numerical values to document pairs which have higher syntactic and semantic relationship. In this paper, we propose a representation of document by extracting three different types of features from a given document. These are lexical α, syntactic β and semantic γ features. A meta-descriptor for each document is proposed using these three features: first lexical, then syntactic and in the last semantic. A document to document similarity matrix is produced where each entry of this matrix contains a three value vector for each lexical α, syntactic β and semantic γ. The main contributions from this research are (i) A document level descriptor using three different features for text like: lexical, syntactic and semantics. (ii) we propose a similarity function using these three, and (iii) we define a new candidate clustering algorithm using three component of similarity measure to guide the clustering process in a direction that produce more semantic rich clusters. We performed an extensive series of experiments on standard text mining data sets with external clustering evaluations like: F-Measure and Purity, and have obtained encouraging results.
Clustering is a useful technique that organizes a large quantity of unordered text documents into a small number of meaningful and coherent clusters. Measuring similarity and discernment of two documents is not always clear problem and it depends of topical affiliation of the documents. For example, when clustering research papers, two documents are regarded as similar if they share similar topics. When clustering is employed on web sites, we are usually more interested in clustering the component pages according to the type of information that is presented in the page. A variety of similarity or distance measures have been proposed and widely applied, such as cosine similarity, Pearson correlation coefficient, Euclidian distance etc. This paper deals with semantic clustering of text documents written in Serbian language. The aim is to prepare the documents of different formats for clustering, to find key words in the set of documents, clustering documents based on key words and finding the most appropriate document for the given question.
2017
ing for each document. There are several possible extensions to this work: The proposed document clustering approach has many practical applications. One direction is to apply this technique on some specific application area along with application specific optimizations to see the outcome. For example: web search results can be clustered using this approach. The snippets for each cluster are generated to see the quality of these snippets. In the proposed approach each term, whether it is from lexical chain or from topic maps, has an equal effect on similarity calculation for a pair of documents. One possible direction is to introduce discriminative feature weighting for the features in this approach. Discriminative feature weighting has encouraging results for both text clustering and classification tasks.
Knowledge and Information Systems, 2011
Document clustering algorithms usually use vector space model (VSM) as their underlying model for document representation. VSM assumes that terms are independent and accordingly ignores any semantic relations between them. This results in mapping documents to a space where the proximity between document vectors does not reflect their true semantic similarity. This paper proposes new models for document representation that capture semantic similarity between documents based on measures of correlations between their terms. The paper uses the proposed models to enhance the effectiveness of different algorithms for document clustering. The proposed representation models define a corpus-specific semantic similarity by estimating measures of term-term correlations from the documents to be clustered. The corpus of documents accordingly defines a context in which semantic similarity is calculated. Experiments have been conducted on thirteen benchmark data sets to empirically evaluate the effectiveness of the proposed models and compare them to VSM and other well-known models for capturing semantic similarity.
The utilization of textual documents is spontaneously increasing over the internet, email, web pages, reports, journals, articles and they stored in the electronic database format. It is challenging to find and access these documents without proper classification mechanisms. To overcome such difficulties we proposed a semantic document clustering model and develop this model. The document pre-processing steps, semantic information from WordNet help us to be bioavailable the semantic relation from raw text. By reminding the limitation of traditional clustering algorithms on the natural language, we consider semantic clustering by COBWEB conceptual clustering. Clustering quality and high accuracy were one of the most important aims of our research, and we chose F-Measure evaluation for ensuring the purity of clustering. However, there still exist many challenges, like the word, high spatial property, extracting core linguistics from texts, and assignment adequate description for the generated clusters. By the help of Word Net database, we eliminate those issues. In this research paper, there have a proposed framework and describe our development evaluation with evaluation.
2017
Clustering is one of the most important data mining techniques which categorize a large number of unordered text documents into meaningful and coherent clusters. Most of text clustering algorithms do not consider the semantic relationships between words and do not have the ability to recognize and use the semantic concepts.In this paper, a new algorithm has been presented to cluster texts based on meanings of the words. First, a new method has been presented to find semantic relationship between words based on Wordnet ontology then, text data is clustered using the proposed method and hierarchical clustering algorithm. Documents are preprocessed, converted to vector space model, and then are clustered using the proposed algorithm semantically. The experimental results show that the quality and accuracy of the proposed algorithm are more reliable than the existing hierarchical clustering algorithms.
Clustering is a branch of data mining which involves grouping similar data in a collection known as cluster. Clustering can be used in many fields, one of the important applications is the intelligent text clustering. Text clustering in traditional algorithms was collecting documents based on keyword matching, this means that the documents were clustered without having any descriptive notions. Hence, non-similar documents were collected in the same cluster. The key solution for this problem is to cluster documents based on semantic similarity, where the documents are clustered based on the meaning and not keywords. In this research, fifty papers which use semantic similarity in different fields have been reviewed, thirteen of them that are using semantic similarity based on document clustering in five recent years have been selected for a deep study. A comprehensive literature review for all the selected papers is stated. A comparison regarding their algorithms, used tools, and evaluation methods is given. Finally, an intensive discussion comparing the works is presented.
International Journal of Engineering & Technology, 2018
Document Clustering is an unsupervised method for classified documents in clusters on the basis of their similarity. Any document get it place in any specific cluster, on the basis of membership score, which calculated through membership function. But many of the traditional clustering algorithms are generally based on only BOW (Bag of Words), which ignores the semantic similarity between document and Cluster. In this research we consider the semantic association between cluster and text document during the calculation of membership score of any document for any specific cluster. Several researchers are working on semantic aspects of document clustering to develop clustering performance. Many external knowledge bases like WordNet, Wikipedia, Lucene etc. are utilized for this purpose. The proposed approach exploits WordNet to improve cluster member ship function. The experimental result shows that clustering quality improved significantly by using proposed framework of semantic appro...
2014
Clustering is an automatic learning technique aimed at grouping a set of objects into subsets or clusters. Objects in the same cluster should be as similar as possible, whereas objects in one cluster should be as dissimilar as possible from objects in the other clusters. Document clustering has become an increasingly important task in analysing huge documents. The challenging aspect to analyse the enormous documents is to organise them in such a way that facilitates better search and knowledge extraction without introducing extra cost and complexity. Document clustering has played an important role in many fields like information retrieval and data mining. In this paper, first Document Clustering has been proposed using Hierarchical Agglomerative Clustering and K-Means Clustering Algorithm.Here, the approach is purely based on the frequency count of the terms present in the documents where context of the documents are totally ignored. Therefore, the method is modified by incorporati...
Eighth Sense Research Group
ABSTRACT The explosive growth of information stored in unstructured texts created a great demand for new and powerful tools to acquire useful information, such as text mining. Document clustering is one of its the powerful methods and by which document retrieval, organization and summarization can be achieved. Text documents are the unstructured databases that contain raw data collection. The clustering techniques are used group up the text documents according to its similarity. As there is a huge amount of unstructured data and there is a semantic correlation between features of data it is difficult to handle that. There are large no of feature selection methods that are used to used to improve the efficiency and accuracy of clustering process. The feature selection was done by eliminate the redundant and irrelevant items from the text document contents. Statistical methods were used in the text clustering and feature selection algorithm. The semantic clustering and feature selection method was proposed to improve the clustering and feature selection mechanism with semantic relations of the text documents. Keywords:- Clustering, CHIR, CHIRSIM, K-means algorithm
2010
Document clustering is one of the most major techniques to group documents automatically. This technique is to divide a given set of documents into a certain number of clusters automatically. In this technique, the first step is ’feature extraction’ from documents. As a feature used in the conventional methods, we frequently use a set of words that contains nouns and verbs. Although words are used as features in a generic clustering framework, some previous research proposes the clustering method using the other features based on vector space model such as kernel methods and adaptive sprinkling. However, in previous research of document clustering, the method of appending new feature vectors obtained by using relationship between the existing documents and other documents has not been reported yet. So, we propose a new method for clustering documents using the relationship between the existing documents and other documents to acquire the more useful clusters for users. Our method ca...
International Journal of Advanced Computer Science and Applications
Existing approaches for text clustering are either agglomerative, divisive or based on frequent itemsets. However, most of the suggested solutions do not take the semantic associations between words into account and documents are only regarded as bags of unrelated words. Indeed, traditional text clustering methods usually focus on the frequency of terms in documents to create connected homogenous clusters without considering associated semantic which will of course lead to inaccurate clustering results. Accordingly, this research aims to understand the meanings of text phrases in the process of clustering to make maximum usage and use of documents. The semantic web framework is filled with useful techniques enabling database use to be substantial. The goal is to exploit these techniques to the full usage of the Resource Description Framework (RDF) to represent textual data as triplets. To come up a more effective clustering method, we provide a semantic representation of the data in texts on which the clustering process would be based. On the other hand, this study opts to implement other techniques within the clustering process such as ontology representation to manipulate and extract meaningful information using RDF, RDF Schemas (RDFS), and Web Ontology Language (OWL). Since Text clustering is an indispensable task for better exploitation of documents, the use of documents may be more intelligently conducted while considering semantics in the process of text clustering to efficiently identify the more related groups in a document collection. To this end, the proposed framework combines multiple techniques to come up with an efficient approach combining machine learning tools with semantic web principles.
2015
Document clustering recently became a vital approach as numbers of documents on web and on proprietary repositories are increased in unprecedented manner. The documents that are written in human language generally contain some context and usage of words mainly dependent upon the same context; recently researchers have attempted to enrich document representation via external knowledge base. This can facilitate the contextual information in the clustering process. An enrichment process with explicit content analysis using Wikipedia as knowledge base has been proposed. The approach is distinct in the sense that only the conceptual words from a document were used and their frequency to embed the contextual information. Hence, the approach does not over enrich the documents. A vector based representation, with cosine similarity and agglomerative hierarchical clustering is used to perform actual document clustering. The proposed method was compared with existing relevant approaches on NEW...
Künstliche Intelligenz, 2002
Text clustering typically involves clustering in a high dimensional space, which appears difficult with regard to virtually all practical settings. In addition, given a particular clustering result it is typically very hard to come up with a good explanation of why the text clusters have been constructed the way they are. In this paper, we propose a new approach for applying background knowledge during preprocessing in order to improve clustering results and allow for selection between results. We preprocess our input data applying an ontology-based heuristics for feature selection and feature aggregation. Thus, we construct a number of alternative text representations. Based on these representations, we compute multiple clustering results using K-Means. The results may be distinguished and explained by the corresponding selection of concepts in the ontology. Our results compare favourably with a sophisticated baseline preprocessing strategy.
2018
Document Clustering is the process of forming clusters from the whole document and is used in multiple fields like information retrieval, text mining. Earlier, when we were having large document, it was tedious task to parse the whole document and determine all the context of it. In this paper, we investigate how the different wordNet operators helps in improving the performance of the document clustering system. In this paper, we also applied the EM clustering algorithm and the comparison of EM and K-Means clustering algorithms.
Incorporating semantic knowledge from an ontology into document clustering is an important but challenging problem. While numerous methods have been developed, the value of using such an ontology is still not clear. We show in this paper that an ontology can be used to greatly reduce the number of features needed to do document clustering. Our hypothesis is that polysemous and synonymous nouns are both relatively prevalent and fundamentally important for document cluster formation. We show that nouns can be efficiently identified in documents and that this alone provides improved clustering. We next show the importance of the polysemous and synonymous nouns in clustering and develop a unique approach that allows us to measure the information gain in disambiguating these nouns in an unsupervised learning setting. In so doing, we can identify a core subset of semantic features that represent a text corpus. Empirical results show that by using core semantic features for clustering, one can reduce the number of features by 90% or more and still produce clusters that capture the main themes in a text corpus.
Traditional clustering algorithms do not consider the semantic relationships among documents so that cannot accurately represent cluster of the documents. To overcome these problems, introducing semantic information from ontology such as WordNet has been widely used to improve the quality of text clustering. However, there exist several challenges such as extracting core semantics from texts, assigning appropriate description for the generated clusters and diversity of vocabulary. In this project we report our attempt towards integrating WordNet with lexical chains to alleviate these problems. The proposed approach exploits the way we can identify the theme of the document based on disambiguated core semantic features extracted and exploits the characteristics of lexical chain based on WordNet. In our approach the main contributions are preprocessing of document which identifies the noun as a feature by performing tagging and lemmatization, performing word sense disambiguation to obtained candidate words based on the modified similarity approach and finally the generation of cluster based on lexical chains. We observed better performance of lexical chain based on the chain evaluation heuristic whose threshold is set to 50%. In future we can demonstratethe lexical chains can lead to improvements in performance of text clustering using ontologies.
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