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IOSR Journal of Computer Engineering (IOSR-JCE)
e-ISSN: 2278-0661, p- ISSN: 2278-8727Volume 10, Issue 4 (Mar. - Apr. 2013), PP 78-82
www.iosrjournals.org
www.iosrjournals.org 78 | Page
Efficient design of feedforward network for pattern classification
Preksha Pareek, Prof.Prema K.V.
Student M.Tech(Computer Science) ,FET-MITS ,Lakshmangarh India
Professor, M.Tech(Computer Science) ,FET-MITS ,Lakshmangarh India
Abstract: A feedforward neural network is a computing device whose processing units (the nodes) are
distributed in adjacent layers connected through unidirectional links (the weights).Feedforward networks are
widely used for pattern recognition. Here two feedforward networks are taken into consideration, Multi Layer
Perceptron and Radial Basis Network. while designing these networks problem involves in finding the
architecture which is efficient in terms of training time. In this paper different data samples will be presented to
RBF and Multi Layer network and the best network selection will be done on the basis of minimum time taken
by the network for training.
Keywords- Feed forward network, Multi Layer Perceptron Neural Networks, Radial Basis Network, Spread.
I. INTRODUCTION
Pattern recognition is the study of how machines can observe the environment, learn to explore patterns
of interest from their background, and make reasonable decisions about the classes of the patterns. the main
properties of neural networks are that they have the ability to learn nonlinear input-output relationships, use
sequential training procedures, and adapt themselves to the data. the most commonly used neural network
family for pattern classification tasks is the feed-forward network, which includes Multi Layer
Perceptron(MLP) and Radial-Basis Function (RBF) networks[9]. Neural networks can be viewed as massively
parallel computing systems consisting of an extremely large number of simple processors with many
interconnections. Neural network models attempt to use some organizational principles (such as learning,
generalization, adaptivity, fault tolerance and distributed representation. computation) in a network of weighted
directed graphs in which the nodes are artificial neurons and directed edges (with weights) are connections
between neuron outputs and neuron inputs. The main characteristics of neural networks are that they have the
ability to learn complex nonlinear input-output relationships, use sequential training procedures, and adapt
themselves to the data.
Feed-Forward Networks
In a feed-forward neural network, information flows from the inputs to the outputs, without any cycle
in their structure.The source nodes in the input layer of the network supply input vector, which constitute the
input signal applied to that neuron in the second layer. The output of second layer are used as input to the third
layer. Typically the neurons in each layer of the network have the inputs as outputs of preceding layer
only[4].Here two types of feedforward networks have been used:-
1)Radial Basis Network.
2)Multi Layer Perceptron.
Radial Basis Network(RBF)
A feedforward neural network is a computing device whose processing units (the nodes) are distributed
in adjacent layers connected through unidirectional links (the weights). In particular, a RBF network is a fully
connected network with on hidden layer, whose nodes have some radially symmetric function as activation
function[3]. Radial Basis Function Network (RBFN), with the simplicity of its single-hidden layer structure
have Linear output layer and the radial basis hidden layer structure of RBFN provide the possibility of learning
the connection weights efficiently without local minima problem in a hierarchical procedure so that the linear
weights are learned after determining the centers[2].
Efficient design of feedforwad network for pattern classification
www.iosrjournals.org 79 | Page
wr2
Figure 1:Network Topology of RBF Neural Network.
A function is a RBF function if its output depends on the distance of the input sample from another stored
vector, referred to as the center of the RBF[8]. RBF network is three layer network where the hidden layer
performs a nonlinear transformation and maps the input space onto a new space. The output layer then
implements a linear combiner on this space, where the only adjustable parameters are the weights of the linear
combiner[5]. Basic architecture of RBF network is shown in figure 1 which consists of one hidden layer, and the
output neuron is the weighted sum of all output items of hidden layer. The transfer function of the hidden layer
is the radial basis function, the weight between the input and hidden layer is fixed at 1, which means the weights
between the hidden layer and the output layer are adjustable[10].
Multi Layer Perceptron(MLP)
The most popular class of multilayer feed-forward networks is multilayer perceptrons in which each
computational unit employs either the thresholding function or the sigmoid function. Multilayer perceptrons can
form arbitrarily complex decision boundaries and represent any Boolean function. The development of the back-
propagation learning algorithm for determining weights in a multilayer perceptron has made these networks the
most popular. For classification purposes, m is the number of classes. The squared error cost function most
frequently used in the ANN literature is defined as
The back-propagation algorithm is a gradient-descent method to minimize the squared-error cost function in
Equation[1].Below figure 2 shows architecture of MLP where connection weights are present in both the layers.
Figure 2: Architectural graph of MLP
II. EXPERIMENTAL RESULTS
Dataset
1)Below Poverty Line(BPL) dataset :In this dataset input consist of 13 features are there named as:
1)Land Holding
2)Types of house
3)Availability of clothing
4)Food security
5)Sanitation
6)Consumable durables
7)Literacy status of highest literate
8)Status of household labour
.
.
.
.
.
x1
x2
x3
w11
w12
wrm
wr1
Efficient design of feedforwad network for pattern classification
www.iosrjournals.org 80 | Page
9)Means of livelihood
10)Status of children
11)Types of indebtedness
12)Reason for migration
13)Preference for assistance[6].
Target is specified using 2 values as
1)Belonging to BPL
2)Not belonging to BPL.
Here 293 samples are constructed . For performing training using RBF and MLP same number of neurons will
be used in the hidden layer.
2)Breast cancer dataset: In this dataset 9 inputs features are present, these features are:
1)Clump thickness
2)Uniformity of cell size
3)Uniformity of cell shape
4)Marginal adhesion
5)Single Epithelial cell size
6)Bare nuclei
7)Bland chromatin
8)Normal nucleoli
9)Mitosis
Target value is specified as:
1)Benign
2)Malignant [7]
Here 699 instances are constructed. For performing training using RBF and MLP same number of neurons will
be used in the hidden layer.
Simulation for this experiment was done using Matlab neural network toolbox version 7.1.
1)Using BPL dataset :As shown in table 1 for BPL data RBF and MLP uses same number of hidden neurons
but time taken to train RBF is very less than MLP. For simulation newff is used to train MLP with 1 neuron in
output layer and newrbe function is used to train RBF with spread 1.6.
Network used Activation
function
(Hidden,
Output)
Time (in
seconds)
Number of
hidden
neurons
Radial Basis
Network
Gaussian,
Purelin
.522 293
Multi Layer
Perceptron
Logsig,
Logsig
7 293
Table 1:Architecture and training time taken for BPL data.
Efficient design of feedforwad network for pattern classification
www.iosrjournals.org 81 | Page
Figure 3: Relation between network used and training time for BPL data.
2) Using Breast cancer dataset: As shown in table 2 for cancer data RBF and MLP uses same number of
hidden neurons but time taken to train RBF is very less than MLP. For simulation newff is used to train MLP
with 2 neurons in output layer and newrbe function is used to train RBF with spread 1.6.
Table 2:Architecture and training time taken for breast cancer data.
Figure 4: Relation between network used and training time for breast cancer data.
Network
used
Activation
function
(for both
layers)
Time (in
seconds)
Number of
hidden
neurons
Radial Basis
Network
Radbas 1.323 699
Multi Layer
Perceptron
Logsig 17 699
Efficient design of feedforwad network for pattern classification
www.iosrjournals.org 82 | Page
III. CONCLUSION
In this work comparative analysis of training time is done between RBF and MLP by using BPL
dataset and breast cancer dataset. In both the datasets RBF performs training faster than MLP using same
number of neurons without affecting performance.
References
[1] Anil K. Jain , Robert P.W. Duin, Jianchang Mao ,”Statistical Pattern Recognition : a Review”, IEEE Transactions on pattern
analysis and machine intelligence, vol. 22, no. 1, January 2000.
[2] Zekeriya Uykan, Cüneyt Güzelis¸, M. Ertugrul Çelebi, and Heikki N. Koivo “Analysis of Input–Output Clustering for Determining
Centers of RBFN”, IEEE transactions on neural networks, vol. 11, no. 4, July 2000.
[3] Francesco Lampariello, Marco Sciandrone,” Efficient Training of RBF neural networks for pattern recognition”, IEEE transactions
on neural networks, vol. 12, no. 5, September 2001.
[4] Simon Haykin “NEURAL NETWORK AND LEARNING MACHINE”, Tata McGraw Hill Education Private Limited Edition
third.
[5] Ilias Maglogiannis, Haralambos Sarimveis, C. T. Kiranoudis, Aristotelis A. Chatziioannou, Nikos Oikonomou, Vassilis Aidinis”
Radial Basis Function Neural Networks Classification for the Recognition of Idiopathic Pulmonary Fibrosis in Microscopic
Images”, IEEE transactions on information technology in biomedicine, vol. 12, no. 1, January 2008.
[6] Indira Hirway,” Identification of BPL Households for Poverty Alleviation Programmes” Economic and Political Weekly,
2003,vol 38,no 45,pp 4803-4808.
[7] UCI machine learning dataset http://mlearn.ics.uci.edu/~Mlearn/MLRepository.html.
[8] Kishan Mehrotra, Chilukuri K. Mohan, Sanjay Ranka,”ELEMENTS OF ARTIFICIAL NEURAL NETWORKS”,Penram
International Publishing(India) Pvt. Ltd,2009.
[9] Jayanta Kumar Basu, Debnath Bhattacharyya, Tai-hoon Kim,” Use of artificial neural network in pattern recognition” International
Journal of Software Engineering and Its Applications Vol. 4, No. 2, April 2010.
[10] Jing Bi, Kun Zhang, Xiaojing Cheng,” Intrusion Detection Based on RBF Neural Network” International Symposium on
Information Engineering and Electronic Commerce”2009.

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Efficient design of feedforward network for pattern classification

  • 1. IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661, p- ISSN: 2278-8727Volume 10, Issue 4 (Mar. - Apr. 2013), PP 78-82 www.iosrjournals.org www.iosrjournals.org 78 | Page Efficient design of feedforward network for pattern classification Preksha Pareek, Prof.Prema K.V. Student M.Tech(Computer Science) ,FET-MITS ,Lakshmangarh India Professor, M.Tech(Computer Science) ,FET-MITS ,Lakshmangarh India Abstract: A feedforward neural network is a computing device whose processing units (the nodes) are distributed in adjacent layers connected through unidirectional links (the weights).Feedforward networks are widely used for pattern recognition. Here two feedforward networks are taken into consideration, Multi Layer Perceptron and Radial Basis Network. while designing these networks problem involves in finding the architecture which is efficient in terms of training time. In this paper different data samples will be presented to RBF and Multi Layer network and the best network selection will be done on the basis of minimum time taken by the network for training. Keywords- Feed forward network, Multi Layer Perceptron Neural Networks, Radial Basis Network, Spread. I. INTRODUCTION Pattern recognition is the study of how machines can observe the environment, learn to explore patterns of interest from their background, and make reasonable decisions about the classes of the patterns. the main properties of neural networks are that they have the ability to learn nonlinear input-output relationships, use sequential training procedures, and adapt themselves to the data. the most commonly used neural network family for pattern classification tasks is the feed-forward network, which includes Multi Layer Perceptron(MLP) and Radial-Basis Function (RBF) networks[9]. Neural networks can be viewed as massively parallel computing systems consisting of an extremely large number of simple processors with many interconnections. Neural network models attempt to use some organizational principles (such as learning, generalization, adaptivity, fault tolerance and distributed representation. computation) in a network of weighted directed graphs in which the nodes are artificial neurons and directed edges (with weights) are connections between neuron outputs and neuron inputs. The main characteristics of neural networks are that they have the ability to learn complex nonlinear input-output relationships, use sequential training procedures, and adapt themselves to the data. Feed-Forward Networks In a feed-forward neural network, information flows from the inputs to the outputs, without any cycle in their structure.The source nodes in the input layer of the network supply input vector, which constitute the input signal applied to that neuron in the second layer. The output of second layer are used as input to the third layer. Typically the neurons in each layer of the network have the inputs as outputs of preceding layer only[4].Here two types of feedforward networks have been used:- 1)Radial Basis Network. 2)Multi Layer Perceptron. Radial Basis Network(RBF) A feedforward neural network is a computing device whose processing units (the nodes) are distributed in adjacent layers connected through unidirectional links (the weights). In particular, a RBF network is a fully connected network with on hidden layer, whose nodes have some radially symmetric function as activation function[3]. Radial Basis Function Network (RBFN), with the simplicity of its single-hidden layer structure have Linear output layer and the radial basis hidden layer structure of RBFN provide the possibility of learning the connection weights efficiently without local minima problem in a hierarchical procedure so that the linear weights are learned after determining the centers[2].
  • 2. Efficient design of feedforwad network for pattern classification www.iosrjournals.org 79 | Page wr2 Figure 1:Network Topology of RBF Neural Network. A function is a RBF function if its output depends on the distance of the input sample from another stored vector, referred to as the center of the RBF[8]. RBF network is three layer network where the hidden layer performs a nonlinear transformation and maps the input space onto a new space. The output layer then implements a linear combiner on this space, where the only adjustable parameters are the weights of the linear combiner[5]. Basic architecture of RBF network is shown in figure 1 which consists of one hidden layer, and the output neuron is the weighted sum of all output items of hidden layer. The transfer function of the hidden layer is the radial basis function, the weight between the input and hidden layer is fixed at 1, which means the weights between the hidden layer and the output layer are adjustable[10]. Multi Layer Perceptron(MLP) The most popular class of multilayer feed-forward networks is multilayer perceptrons in which each computational unit employs either the thresholding function or the sigmoid function. Multilayer perceptrons can form arbitrarily complex decision boundaries and represent any Boolean function. The development of the back- propagation learning algorithm for determining weights in a multilayer perceptron has made these networks the most popular. For classification purposes, m is the number of classes. The squared error cost function most frequently used in the ANN literature is defined as The back-propagation algorithm is a gradient-descent method to minimize the squared-error cost function in Equation[1].Below figure 2 shows architecture of MLP where connection weights are present in both the layers. Figure 2: Architectural graph of MLP II. EXPERIMENTAL RESULTS Dataset 1)Below Poverty Line(BPL) dataset :In this dataset input consist of 13 features are there named as: 1)Land Holding 2)Types of house 3)Availability of clothing 4)Food security 5)Sanitation 6)Consumable durables 7)Literacy status of highest literate 8)Status of household labour . . . . . x1 x2 x3 w11 w12 wrm wr1
  • 3. Efficient design of feedforwad network for pattern classification www.iosrjournals.org 80 | Page 9)Means of livelihood 10)Status of children 11)Types of indebtedness 12)Reason for migration 13)Preference for assistance[6]. Target is specified using 2 values as 1)Belonging to BPL 2)Not belonging to BPL. Here 293 samples are constructed . For performing training using RBF and MLP same number of neurons will be used in the hidden layer. 2)Breast cancer dataset: In this dataset 9 inputs features are present, these features are: 1)Clump thickness 2)Uniformity of cell size 3)Uniformity of cell shape 4)Marginal adhesion 5)Single Epithelial cell size 6)Bare nuclei 7)Bland chromatin 8)Normal nucleoli 9)Mitosis Target value is specified as: 1)Benign 2)Malignant [7] Here 699 instances are constructed. For performing training using RBF and MLP same number of neurons will be used in the hidden layer. Simulation for this experiment was done using Matlab neural network toolbox version 7.1. 1)Using BPL dataset :As shown in table 1 for BPL data RBF and MLP uses same number of hidden neurons but time taken to train RBF is very less than MLP. For simulation newff is used to train MLP with 1 neuron in output layer and newrbe function is used to train RBF with spread 1.6. Network used Activation function (Hidden, Output) Time (in seconds) Number of hidden neurons Radial Basis Network Gaussian, Purelin .522 293 Multi Layer Perceptron Logsig, Logsig 7 293 Table 1:Architecture and training time taken for BPL data.
  • 4. Efficient design of feedforwad network for pattern classification www.iosrjournals.org 81 | Page Figure 3: Relation between network used and training time for BPL data. 2) Using Breast cancer dataset: As shown in table 2 for cancer data RBF and MLP uses same number of hidden neurons but time taken to train RBF is very less than MLP. For simulation newff is used to train MLP with 2 neurons in output layer and newrbe function is used to train RBF with spread 1.6. Table 2:Architecture and training time taken for breast cancer data. Figure 4: Relation between network used and training time for breast cancer data. Network used Activation function (for both layers) Time (in seconds) Number of hidden neurons Radial Basis Network Radbas 1.323 699 Multi Layer Perceptron Logsig 17 699
  • 5. Efficient design of feedforwad network for pattern classification www.iosrjournals.org 82 | Page III. CONCLUSION In this work comparative analysis of training time is done between RBF and MLP by using BPL dataset and breast cancer dataset. In both the datasets RBF performs training faster than MLP using same number of neurons without affecting performance. References [1] Anil K. Jain , Robert P.W. Duin, Jianchang Mao ,”Statistical Pattern Recognition : a Review”, IEEE Transactions on pattern analysis and machine intelligence, vol. 22, no. 1, January 2000. [2] Zekeriya Uykan, Cüneyt Güzelis¸, M. Ertugrul Çelebi, and Heikki N. Koivo “Analysis of Input–Output Clustering for Determining Centers of RBFN”, IEEE transactions on neural networks, vol. 11, no. 4, July 2000. [3] Francesco Lampariello, Marco Sciandrone,” Efficient Training of RBF neural networks for pattern recognition”, IEEE transactions on neural networks, vol. 12, no. 5, September 2001. [4] Simon Haykin “NEURAL NETWORK AND LEARNING MACHINE”, Tata McGraw Hill Education Private Limited Edition third. [5] Ilias Maglogiannis, Haralambos Sarimveis, C. T. Kiranoudis, Aristotelis A. Chatziioannou, Nikos Oikonomou, Vassilis Aidinis” Radial Basis Function Neural Networks Classification for the Recognition of Idiopathic Pulmonary Fibrosis in Microscopic Images”, IEEE transactions on information technology in biomedicine, vol. 12, no. 1, January 2008. [6] Indira Hirway,” Identification of BPL Households for Poverty Alleviation Programmes” Economic and Political Weekly, 2003,vol 38,no 45,pp 4803-4808. [7] UCI machine learning dataset http://mlearn.ics.uci.edu/~Mlearn/MLRepository.html. [8] Kishan Mehrotra, Chilukuri K. Mohan, Sanjay Ranka,”ELEMENTS OF ARTIFICIAL NEURAL NETWORKS”,Penram International Publishing(India) Pvt. Ltd,2009. [9] Jayanta Kumar Basu, Debnath Bhattacharyya, Tai-hoon Kim,” Use of artificial neural network in pattern recognition” International Journal of Software Engineering and Its Applications Vol. 4, No. 2, April 2010. [10] Jing Bi, Kun Zhang, Xiaojing Cheng,” Intrusion Detection Based on RBF Neural Network” International Symposium on Information Engineering and Electronic Commerce”2009.