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A Hybrid Text Classification Approach Using KNN And SVM

M.Sivakumar, C.Karthika, P.Renuga
  1. Assistant Professor, Department Of Computer Science and Engineering, Thiagarajar College of Engineering, Madurai, India
  2. PG Student, Department Of Computer Science and Engineering, Thiagarajar College of Engineering, Madurai, India
  3. Associate Professor, Department Of Electrical and Electronic Engineering, Thiagarajar College of Engineering, Madurai, India
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Abstract

Text classification is the process of assigning text documents based on certain categories. A classifier is used to define the appropriate class for each text document based on the input algorithm used for classification. Due to the emerging trends in the field of internet and computers ,billions of text data are processed at a given time and so there is a need for organizing these data to provide easy storage and accessing .Many text classification approaches were developed for effectively solving the problem of identifying and classifying these data .In this project a new text document classifier is proposed by integrating the nearest neighbor classification approach with the support vector machine(SVM) training algorithm. The proposed SVM-NN approach aims to reduce the impact of parameters in classification accuracy. In the training stage, the SVM is utilized to reduce the training samples for each of the available categories to their support vectors (SVs).The SVs from different categories are used as the training data of nearest neighbor classification algorithm in which the similarity measures or distance function is used to calculate the which class does the testing data belongs and which also reduce time consumption.

Keywords

Machine Learning,Text document classification, Nearest Neighbor, Support Vector Machine, Distance function

INTRODUCTION

Data mining is the process of extracting hidden predictive information from large databases. Data mining is a tool that predicts future trends and behaviors. The scope of data mining can generate new business opportunities by providing these capabilities as automated prediction of trends and behaviors and automated discovery of previously unknown patterns. Text mining also referred to as text data mining and equivalent to text analysis. It is the process of deriving high-quality information from text. Analysis involves Information retrieval and pattern recognition. Text mining also referred to as text data mining, roughly equivalent to text analytics. Text analytics refers to the process of deriving high-quality information from text. High-quality information is typically derived through the devising of patterns and trends through means such as statistical pattern learning .Text mining usually involves the process of structuring the input text, usually parsing, along with the addition of some derived linguistic features and the removal of others, and subsequent insertion into a database, deriving patterns within the structure data, and finally evaluation and interpretation of the output. ’High quality’ in text mining usually refers to some combination of relevance.
One of the most effective binary classification techniques is the support vector machines (SVMs). It has been demonstrated that the method performs superbly in binary discriminative text .As one of the discriminative classification methods, SVM classification has been shown to be more accurate than other classification approaches. The proposed hybridized algorithm was under in binary and multiclass classification of data. The results were compared to those obtained by single SVM and KNN. In this study, the linear kernel function is included in the SVM and HKNNSVM procedure, so the SVM, KNN and HKNNSVM are linear process. It has been demonstrated that the proposed method is a useful tool for classification and the classification performance is stable. It has indicated that the proposed classifier is superior to some other classifier.
The rest of the section is organized as follows: Section II describes the literature. The proposed approach is described in section III. Section IV discusses the experimental result and is concluded in section V.

LITERATURE REVIEW

Classification approaches like decision tree induction, rule induction, self organizing map, k nearest neighbor classification, artificial neural network, support vector machines, Bayesian classification exist in literature. KNN and SVM approaches are proven to be efficient [1]. The KNN (k-nearest neighbor) method is said to efficient and provides good results in classification, they are performing as lazy learning method which keeps the entire training samples until classification time. Text classification using single approach is not much effective output. No hybrid approach is used to predict the text classification. There is not much preference for identifying the short, stem, and stop words for the text classification. The similarity measure for the nearest neighbor doesn’t work much accuracy value to generate the text classification.
Fig.1 shows an example of 5-NN classifier of three categories, which is represented in 3 different shapes as dot(.), diamond( ),star ( ) respectively. The input data points which is classified in the testing stage.
The drawbacks in the existing algorithm are
Accuracy for text classification is not too high area
No hybrid approach is obtained
No Euclidean distance or hyper plane is involved to identify the classification.
image
An SVM constructs a hyper plane or set of hyper planes in a high –or infinite –dimensional space, which can be used for classification, regression, or other tasks. Intuitively, a good separation is achieved by the hyper plane that has the largest distance to the nearest training data point of any class and so- called functional margin, since in general the larger the margin the lower the generalization error of the classifier.
image
Zhen Mei, Qi Shen, Baoxian Ye (2008) proposed an efficient hybridized k-nearest neighbor (KNN) classifiers and SVM algorithm for multiclass classification of gene expression data. This KNN algorithm prunes training samples and combines with SVM to classify samples. Compared with SVM and KNN, the Misclassification rate of HKNNSVM for datasets were notably lower, which indicated that the classification performance of HKNNSVM was stable.
Tai Li, Shenghuo Zhu, Mistsunori Ogihara (2008) proposed a method for categorization of text document via discriminant analysis. Here problem of text categorization is optimized via discriminate analysis, then categorize the text by finding coordinate transformations that reflect similarity from data. By using generalized singular value decomposition‖ (GSVD), it’s a transformation that reflects the class structure indicated by singular values is identified. But the cost of the operation is extremely large in document analysis.
Yiming Yang and Xin Liu proposed an effective reexamination of text categorization approaches of statistical test using five categorization method as KNN, SVM, NNet (Neural Network), NB (Naive Bayes) classifier , LLSF (Linear Least square Fit). Among them SVM, KNN, LLSF outperform the results than the NB, NNet when the number of positive training set per categories are small. Euihong (sam) Han,George karypis , and Vipin Kumar (1999) proposed a text categorization of documents by using the K nearest neighbor. The KNN learn the importance of discriminating words by using techniques as mutual information and weight adjustment. Using WAKNN for categorization facing a problem as how to avoid local minima and solution to local minima lead to change weights of multiple words at a time.

PROPOSED APPROACH

Applied a hybrid approach (KNN-SVM) for the text classification. In the training stage, the SVM is utilized to reduce the training samples for each of the available categories to their support vectors (SVs). The nearest centroid classifier approach is combined with the SVM. NC-SVM provides the accurate text classification as better performance than K-nearest neighbor.Even though the nearest neighbor and support vector machine involves high effective classification at individual works they combined to produce more accurate text.
The vector space is defined by:
W . X + b= 0 (1)
There are two categories of data points which have been mapped into the vector space, represented by ―circle‖ and ―square‖ respectively. Based on the optimal separating hyper-plane can be constructed by maximizing the margin of d1 + d2. After identifying the SVs of each of the categories, the rest of the training data points could be eliminated. On the classification stage, the optimal separating hyper-plane is discarded since its role in making the classification decision has been replaced by the distance function.
The steps involved in the proposed approach are:
1. Analyze Document
2. Training set
3. Hyper plane Construction
4. Support vector
5. Distance Calculation
image
A. Analyze Dataset
Include all the documents and extract the content of the documents. The contents of the documents further performed the removal of stop words and stemming. This basic mining performance of the document content will be performed for all the words in the document. Here we use the Reuter dataset consists the classification for the title and its sentence. This phase runs with the training data set and pre-processing the original data set and identifying the short, stem, stops words. Finally the preprocessed dataset is considered for further process.
B. Training Sets
This phase were consider the input of pre-processed datasets and further more we classify the data and stored in the database. The database maintains the classified data sets. Further identifying the repetitive title and sentence values to identify the Bayesian vectorization module. The Bayesian value is identified for the repeating values with the help of classifier method. Which helps in the identifying the classification values for the training sets. The KNN compiles the entire training data points again when there is a new input sample and it discards the immediate result. This involves the nearest neighbor method based graph is drawn. As per they show the positions of the title sentence. This generated nearest neighbor helps in easy text classification.
C. Hyper-Plane Construction
These hyper planes are said to the separation or the classifier constraint for the text classification. Optimal separating hyper-plane plays important role in the identifying the support vector. As before performing the construction of the optimal hyper - plane. We insert all the training data points. There are many hyper planes generated with the help of support vector machine values. There are an infinite number of hyper-planes (the dashed lines) could be generated, but there is only one hyperplane (the solid line) which could optimally separate the data points from different categories. These values will be identified with the help of size; price allocated for the transaction in GB or MB, the frequency of the dataset is taken. As these values iteratively find for all records under the field. Hence the dataset size remains same no further elimination is performed in this module. Finally, were identify the minimum privacy preserving cost. That the minimum solution mentioned herein is somewhat psedominimum because an upper bound of joint privacy leakage is just an approximation of its exact value.
D. Support Vector
The support vector machine (SVM) has been reported as a discriminative classifier which is more accurate than most other classification models. The nearest data points to the optimal separating hyper-plane are called support vectors (SVs). There is a certain way to represent the SVs for a given set of training data points, and the maximal margin can be found by minimizing. Support vectors of each category are identified, and the remaining training data points are discarded. New unlabeled data point is mapped into the same vector space of support vectors which obtained from the training stage. The SVM-NN approach suffers from the high time consumption in the classification stage, due to the fact that the average Euclidean distances between the input data point and the support vectors for each of the categories are needed to be calculated in order to make the classification decision.
E. Distance Calculation
Here the nearest centroid algorithm is used for this computation, instead of Euclidean distance formula. The average distance of the SVs of a particular category and the new data point is calculated by using the formula. The distance calculation defines the spaces in the hyperplane, for identifying the points that falls inside the space region between the hyperplane and the Euclidean distance they are considered to the text classifications. Those count values of the points fall in between the region said to the text classifications.
image

EXPERIMENTS

Experiments were carried out on a variety of datasets, most of which are frequently used in the information retrieval research. The range of the number of classes is from 4 to 105 and the range of the number of documents is from 476 to 20,000, which seem to vary enough to obtain good insights as to how GDA performs.
A. Benchmark dataset
The Reuters-21578 R8 dataset which had been used in our experiments was acquired from Ana Cardoso- Cachopo’s website, which is the same source where the WebKB dataset was acquired. This collection consists of 7670 documents which had been categorized into 8 categories. The documents in the collection had been divided into training set and testing set, which consist of 5483 documents and 2187 documents respectively, which had been categorized into 8 categories. The documents in the collection had been divided into training set and testing set, which consist of 5483 documents and 2187 documents respectively. The characteristics of the dataset are Text and the attribute characteristic is categorical type. Number of instances in the dataset is 21578 and the number of attribute is 5
image
B. Performance anaysis
The performance analysis shows that the accuracy of the KNN classifier is good for lesser values of the parameter. But as the parameter value k increases the accuracy of classification and decreases gradually. In the proposed SVM-NN method the accuracy stays optimal for even huge values of the parameter c. The accuracy compared to the KNN method is higher in the SVM-NN.
The classification can be calculated by using the metrics given below,
image

CONCLUSION

A hybrid classification approach which incorporates the SVM to the training stage of the KNN classification approach is presented. Unlike the conventional KNN classification approach, the SVM-NN approaches have low impact on the implementation of the parameter. The classification accuracy of the SVM-NN approach is relatively consistent with the implementation of the different values of the parameter, as compared to the conventional KNN approach. The classification accuracy is severely degraded if inappropriate values of parameter are reported to the classifier. Hence, the determination of the appropriate value for the parameter is not a critical requirement for the SVM-NN classification approach. Especially in the situation where the training samples are limited and insufficient for the preparation of the training sset and the validation set. However, the SVM-NN approaches suffers from high time consumption in the classification stage ,due to the fact that the average Euclidean distances between the input data point and the support vectors for each of the categories are needed to be calculated in order to the classification decision. In the future, other alternative methods for calculating distance and similarity measurement, with lower computational cost, in order to propose a more effective and efficient classification approach.

References

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