Soft Computing Techniques Based Image Classification using Support Vector Machine Performance

International Journal of Trend in Scientific Research and Development (IJTSRD)
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Soft Computing Techniques Based Image Classification
using Support Vector Machine Performance
Tarun Jaiswal1, Dr. S. Jaiswal1, Dr. Ragini Shukla2
1Guru Ghasidas Central University, Bilaspur, Chhattisgarh, India
2Department of It, CVRU, Bilaspur Kota, Bilaspur, Chhattisgarh, India
How to cite this paper: Tarun Jaiswal |
Dr. S. Jaiswal | Dr. Ragini Shukla "Soft
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ABSTRACT
In this paper we compare different kernel had been developed for support
vector machine based time series classification. Despite the better presentation
of Support Vector Machine (SVM) on many concrete classificationproblems,the
algorithm is not directly applicable to multi-dimensional routes havingdifferent
measurements. Training support vector machines(SVM) with indefinitekernels
has just fascinated consideration in the machine learning public. This is
moderately due to the fact that many similarity functions that arise in practice
are not symmetric positive semidefinite.In thispaper,byspreadingtheGaussian
RBF kernel by Gaussian elastic metric kernel. Gaussian elastic metric kernel is
extended version of Gaussian RBF. The extended version divided in two ways-
time wrap distance and its real penalty. Experimental results on 17 datasets,
time series data sets show that, in terms of classification accuracy, SVM with
Gaussian elastic metric kernel is much superior to other kernels, and the
ultramodern similarity measure methods. In this paper we used the indefinite
resemblance function or distance directly without any conversion,and,hence, it
always treats both training and test examples consistently. Finally, it achieves
the highest accuracy of Gaussian elastic metric kernel among all methods that
train SVM with kernels i.e. positive semi-definite (PSD) and Non-PSD, with a
statistically significant evidence while also retaining sparsity of the support
vector set.
KEYWORDS: SVM, PSD, time series; support vector machine; dynamic time
warping; kernel method
1. INTRODUCTION
We motivated of kernel algorithm because, Firstly, linearity
is moderately special, and outside mathematically no model
of a real system is actually linear. Secondly, detecting linear
relations has been the focus of much research in statistics,
soft computing and machine vision for decades and the
resulting algorithms are well understood, well developed
and efficient. Naturally, one wants the best of both worlds.
So, if a problem is non-linear, instead of trying to fit a non-
linear model, one can map the problem from the input space
to a new (higher-dimensional) space (called the feature
space) by doing a nonlinear transformation using suitably
chosen basis functions and then use a linear model in the
feature space. This is known as the `kernel trick'. The linear
model in the feature space corresponds to a non-linear
model in the input space. This approach can be used in both
classification and deterioration problems. The choice of
kernel function is crucial for the success of all kernel
algorithms and its variety of types because the kernel
establishes preceding knowledge that is available about a
task. Accordingly, there is no free dine in kernel choice.
According to Martin Sewell, 2007- term kernel is resulting
from a word that can be sketched back to c. 1000 and
originally meant a seed (contained within a fruit) or the
softer (usually edible) part contained withinthehardshellof
a nut or stone-fruit. The former meaning is now superseded.
It was first used in reckoning when it was defined for
integral equations in which the kernel is known and the
other function(s) unknown,butnowhasseveralmeanings in
mathematics. The machine learning term kernel trick was
first used in 1998.
In linear algebra we know that any symmetric matrix K with
real valued entries can be written in the form
where are eigen vectors of K
that form an orthonormal basis (so we alsohave )
and where D is a diagonal matrix with being the
corresponding eigen values. A square matrix A is positive
semi-definite (PSD) i_ for all vectors c we have
. It is well known that a
matrix is positive semi-definite iff all the eigen values are
non-negative.
In this paper we check the condition of symmetric positive
semidefinite with the help of Mercer'sTheoremaccording to
the Mercer's Theorem:
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The sample includes m examples. The
Kernel (Gram) matrix K is an matrix includinginner
productsbetween allpairsof examples i.e.,
is symmetric since
Mercer's Theorem:
A symmetric function is a kernel iff for any finite
sample the kernel matrix for is positive semi-definite.
One direction of the theorem is easy: if is a kernel, and
is the kernel matrix with Then
Theorem:
Consider a finite input space and the
kernel matrix K over the entire space. If K is positive semi-
definite then is a kernel function.
Proof: By the linear algebra facts above we can write
.
Define a feature mapping into a m-dimensional space where
the lth bit in feature expansion for the other direction we
will prove a weaker result.
Example is .
The inner product is
We want to show that
Consider entry of the matrix . We have
the following identities where the last one proves the result.
Note that Mercer's theorem allows us to work with a kernel
function without knowing which featuremapitcorresponds
to or its relevance to the learning problem. This has often
been used in practical applications.
In real-life solicitations, however, many similarity functions
exist that are either indefinite or for which the Mercer
condition is difficult to verify. For example, one can
incorporate the longest common subsequence in defining
distance between genetic sequences, use BLAST similarity
score between protein sequences, use setoperationssuch as
union/intersection in defining similarity between
transactions, use human-judged similarities between
concepts and words, use the symmetrized Kullback-Leibler
divergence between probability distributions, use dynamic
time warping for time series, or use the refraction distance
and shape matching distance in computer vision [1,2,3,4].
Outspreading SVM to indefinite kernels will greatly expand
its applicability. Recent workontrainingSVM withindefinite
kernels has generally warped into three categories: Positive
semidefinite (PSD) kernel approximation, non-convex
optimization (NCO) and learning in Krein spaces (LKS). In
the first approach, the kernel matrix of training examples is
altered so that it becomes PSD. The motivation behind such
approach is to assume that negative eigenvalues are caused
by noise [5,6]. The concluding approach was introduced by
Luss and d'Aspremont in 2007 with enhancements in
training time reported [7,8,9]. All the kernel approximation
methods above guarantee that the optimization problem
remains convex during training. During experiment,
however, the original indefinite kernel function is used.
Hence, training and test examples are treated
contradictorily. In addition, such methods are only useful
when the similarity matrix is approximable by a PSD matrix.
For other similarity functionssuch asthesigmoidkernelthat
can occasionally yield a negative semidefinite matrix for
certain values of its hyper-parameters, the kernel
approximation approach cannot be utilized.
In the second approach, non-convex optimization methods
are used. SMO type decomposition mightbeusedinfindinga
local minimum with indefinite similarity functions [10].
Haasdonk interprets this as a method of minimizing the
distance between reduced convex hulls in a pseudo-
Euclidean space [4]. However, because such approach can
terminate at a local minimum, it does not assurance learning
[1]. Similar to the previous approach, this method only
works well if the similarity matrix is nearly PSD.
The next approach that has been proposed in the writings is
to extend SVM into the Krein spaces, in which a reproducing
kernel is decomposed into the sum of one positive
semidefinite kernel and one negative semidefinite kernel
[11,12]. Instead of minimizing regularized risk,theobjective
function is now stabilized. One fairly recent algorithm that
has been proposed to solve the stabilization problem is
called Eigen-decomposition SVM (ESVM) [12]. While this
algorithm has been shown to outperform all previous
methods, its primary drawback is that it does not produce
sparse solutions, hence the entire list of training examples
are often needed during prediction.
The main contribution of this paper is to establish both
theoretically and experimentally that the 1-norm SVM [13],
which was proposed more than 10 years ago, is a better
solution for extending SVM to indefinite kernels. More
specifically, 1-norm SVM can be interpreted as a structural
risk minimization method that seeks a decision boundary
with large similarity margin in the original space. It uses a
linear algebra preparation that remains convex even if the
kernel matrix is indefinite, and hence can always be solved
quite efficiently. It uses the indefinite similarity function (or
distance) directly without any transformation, and, hence, it
always treats both training and test examples consistently.
In addition, it achieves the highest accurateness among all
the methods that train SVM with indefinite kernels, with a

statistically important indication, while also retaining
sparsity of the support vector set. In the literature, 1-norm
SVM is often used as an surrounded feature selection
method, where learning and featureselection areperformed
concurrently [14, 13, 15, 17, 16,18]. It was studied in [13],
where it was argued that 1-norm SVMhasanadvantageover
standard 2-norm SVM when there are redundant noise
features. To the knowledge of the authors, the advantage of
using 1-norm SVM in handling indefinite kernels has never
been established in the writings.
As a state-of-the-art classifier,supportvectormachine(SVM)
has also been examined and applied for time series
classification in two modes. On one hand, combined with
various feature extraction approaches, SVM can be adopted
as a plug-in method in addressing time series classification
problems. On the other hand, by designing appropriate
kernel functions, SVM can also be performed based on the
original time series data. Because of the time axis distortion
problem, classical kernel functions, such as Gaussian RBF
and polynomial, generally are not suitable for SVM-based
time series classification. Motivated by the success of
dynamic time wrapping distance, it has been suggested to
utilize elastic measure to construct appropriate kernel.
Gaussian DTW kernel is then proposed for SVM based time
series classification [19, 20]. Counter-examples, however,
has been subsequently reported that GDTW kernel usually
cannot outclass GRBF kernel in the SVM framework. Lei and
Sun [21] proved that GDTW kernel is not positive definite
symmetric acceptable by SVM. Experimental results [21, 22]
also showed that SVM with GDTW kernelcannotoutperform
either SVM with GRBF kernel or nearest neighbor classifier
with DTW distance. The poor performance of the GDTW
kernel may be attributed to that DTW is non-metric.
Motivated by recent progress in elastic measure, Zhang et.al
propose a new class of elastic kernel it is an allowance to the
GRBF kernel [23].There are lots of Advantages of kernel and
its types so some of the types we used in this paper for
classification [24]:
The kernel defines a similarity measure between two
data points and thus allows one to incorporate prior
knowledge of the problem domain.
Most importantly, the kernel contains all of the
information about the relative positions of the inputs in
the feature space and the actual learning algorithm is
based only on the kernel function and can thus becarried
out without explicit use of the feature space. The training
data only enter the algorithm through their entries inthe
kernel matrix (a Gram matrix), and never through their
individual attributes. Because one never explicitly has to
evaluate the feature map in the high dimensional feature
space, the kernel function represents a computational
shortcut.
The number of operations required is not necessarily
proportional to the number of features. Support vector
machines is one of the most prevalent classification
algorithms. It is inspired by deep learning practicalities,
which make use of the Vapnik-Chervonenkis dimension
to establish the generalization ability of such clan of
classifiers [25, 26]. However, SVM has its limitations,
which motivated development of numerous variants
including the Distance Weighted Discrimination
algorithm to deal with the data stacking phenomenon
observed in large dimensions [27] and second order
conduit programming techniques for handling uncertain
or missing values assuming availability of second order
moments of data [28]. One fundamental limitingfactor in
SVM is the need for positive semidefinite kernels.
2. Methods
In standard two-class classification problems,wearegiven a
set of training data …… , where the input
and the output is bnary. Wewish to
find a classification rule from the training data, so that when
given a new input we can assign aclass from to
it.
To handle this problem, we consider the 1-norm support
vector machine:
Where a dictionary of basis
functions, and is a tuning parameter. The solution is
denoted as the fitted model is
The classification rule is given by . The 1-
norm SVM has been successfully used in classification. We
argue in this paper that the 1-norm SVM may have some
advantage over the standard 2-norm SVM, especially when
there are redundant noise features. To get a good fitted
model that performs well on future data, we also need
to select an appropriate tuning parameter . In practice,
people usually pre-specify a finite set of values for that
covers a wide range, then either use a separate validation
data set or use cross-validation to select a value for s that
gives the best performance among the given set.
3. Large similarity margins
Given a similarityfunction between
examples and , we can define similarity between an
example and a class to be a weighted sum of
similarities with all of its examples. In other words, we may
write:
(4)
To denote class similarity between and a class .
Here, the weight represents importance of the example
to its class . In addition, we can introduce an offset b that
quantifies prior preference. Such offset plays a role that is
similar to the prior in Bayesian methods, the activation
threshold in neural networks, and the offset in SVM. Thus,
we consider classification using the rule:
y ̂t= sign{s(xt,+1)-s(xt,-1)+b}, (5)

Which is identical to the classification rule of 1-norm SVM
given in Eq 4. Moreover, we define the similarity margin
for example in the usual sense:
(6)
Maximizing the minimum similarity margin can be
formulated as a linear program (LP).
First, we write:
Subject to
However, the decision rule given by Eq. (6) does not change
when we multiply the weights ૃ by any fixed positive
constant including constantsthat arearbitrarilylarge. Thisis
because the decision rule only looks into the sign of its
argument. In particular, we can always rescale the weightsૃ
to be arbitrarily large, for which . This degree of
freedom implies that we need to maximize the ratio
instead of maximizing M in absolute terms. Here, any norm
suffices but the 1-norm is preferred because it produces
sparse solutions and because it gives better accuracy in
practice.
Since our objective is to maximize the ratio , we can
fix M = 1 and minimize . In addition, to avoid over-fitting
outliers or noisy samples and to be able to handle the caseof
non-separable classes,soft-margin constraintsareneededas
well. Hence, 1-norm SVM can be interpreted as a method of
finding a decision boundary with a large similaritymargin in
the original space. Such interpretation holds regardless of
whether or not the similarity function is PSD. Thus, we
expect 1-norm SVM to work well even for indefinite kernels.
Similar to the original SVM, one caninterpret1-norm SVM as
a method of striking a balance between estimation bias and
variance.
4. Gaussian Elastic Metric Kernel (GEMK)
Before the definition of GEMK, we first introduce the GRBF
kernel, one of the most common kernel functions used in
SVM classifier. Given two time series x and y with the same
length n, the GRBF kernel is defined as where σ is the
standard deviation.
GRBF kernel is a PDS kernel. It can be regard as an
embedding of Euclidean distance in the form of Gaussian
function. GRBF kernel requires the time series should have
the same length and cannot handle the problem of time axis
distortion. If the length of two time series is different, re-
sampling usually is required to normalize them to the same
length before further processing. Thus SVM with GRBF
kernel (GRBF-SVM) usually is not suitable for time series
classification. Motivated by the effectiveness of elastic
measures in handling the time axis distortion, it is
interesting to embed elastic distance into SVM-based time
series classification. Generally, there are two kinds of elastic
distance. One is non-metric elastic distance measure, e.g.
DTW, and the other is elastic metric, which iselasticdistance
satisfying the triangle inequality. Recently, DTW, one state-
of-the-art elastic distance, has been proposed to construct
the GDTW kernel [19, 20]. Subsequent studies, however,
show that SVM with GDTW kernel cannot consistently
outperform either GRBF-SVM or 1NN-DTW.
We assume that the poor performance of the GDTW kernel
may be attributed to that DTW is non-metric, and suggest
extending GRBF kernel using elastic metrics. Thus, we
propose a novel class of kernel functions, Gaussian elastic
metric kernel (GEMK) functions.
5. Experiments and Results
In this section, we present experimental results of applying
different SVM to image classification problems, and
determine its efficiency in handling indefinite similarity
functions. As shown in last Figure 1, when the similarity
function is PSD, performance of Gaussian TWED SVM is
comparable to that of SVM. There are different dataset [1,
29-35] we used for measuring the performance. When
running statistical significance tests, we find no statistically
significant evidence that one method better the other at the
96.45% confidence level. The 1-norm SVM method achieves
the highest extrapolative accuracy among all methods that
learn with indefinite kernels, while also retainingsparsity of
the support vector set other than GTWED SVM. Using the
error rate as the performance indicator, we compare the
classification performance of Gaussian elastic matching
kernel SVM with other differentsimilaritymeasuremethods,
including nearest neighbor classifier with Euclidean
(1NNED), nearest neighbor classifier withDTW (1NN-DTW)
nearest neighbor classifier with ODTW (1NN-ODTW),
nearest neighbor classifier with ERP (1NN-ERP) andnearest
neighbor classifier with OTWED (1NN-OTWED). TableI lists
the classification error rates of these methods on each data
set. In our experiments, GRBF-SVM takes the least time
among all above kernel methods. Because the complexity of
Euclidean distance in GRBF kernel is O(n), while in GDTW,
GERP and GTWED, the complexity of DTW,ERP andTWED is
. Besides, the numbers of support vectors of GERP-
SVM and GTWED GTWED-SVM, which are comparable to
that of GDTW-SVM, both are more than that of GRBF-SVM.
Thus, compared with GRBF-SVM, it also takes more time for
GERP-SVM, GTWED-SVM and GDTW-SVM [23].

Figure1:. COMPARATIVE STUDY USING THE DIFFERENT TIME SERIES DATA SETS: CLASSIFICATION ERROR RATES
(AVERAGE TEST ERROR RATE RESULTS) OBTAINED USING SIMILARITY MEASURE METHODS AND SVM CLASSIFIERS
WITH DIFFERENT KERNELS
6. Conclusion
Widespread research determination has been enthusiastic
recently to training support vector machines (SVM) with
indefinite kernels. In this paper, we establish theoretically
and experimentally that a variant of kernels. We Compare
the Study Using the Different Time Series Data Sets:
Classification Error Rates (Average Test Error Rate Results)
Obtained Using Similarity Measure Methods and SVM
Classifiers with Different Kernels. The 1-norm SVM method
formulates large-margin separation as a convex linear
algebra problem without requiring that the kernelmatrix be
positive semidefinite. It uses the indefinite similarity
function directly without any transformation, and, hence, it
always treats both training and test examples consistently.
In addition, Gaussian metric kernel methods in the figure
achieves the highest accuracy among all methods that train
SVM with kernels, with a statistically significant evidence,
while also retaining sparsity of the support vector set. This
important singularity property ensuresthatthe1-norm SVM
is able to delete many noise features by estimating their
coefficients by zero.

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