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Automated Autism Spectral Disorder Classification Using Optimal Machine Learning Model

Hanan Abdullah Mengash1, Hamed Alqahtani2, Mohammed Maray3, Mohamed K. Nour4, Radwa Marzouk1, Mohammed Abdullah Al-Hagery5, Heba Mohsen6, Mesfer Al Duhayyim7,*

1 Department of Information Systems, College of Computer and Information Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia
2 Department of Information Systems, College of Computer Science, Center of Artificial Intelligence and Unit of Cybersecurity, King Khalid University, Abha, Saudi Arabia
3 Department of Information Systems, College of Computer Science, King Khalid University, Abha, Saudi Arabia
4 Department of Computer Sciences, College of Computing and Information System, Umm Al-Qura University, Saudi Arabia
5 Department of Computer Science, College of Computer, Qassim University, Saudi Arabia
6 Department of Computer Science, Faculty of Computers and Information Technology, Future University in Egypt, New Cairo, 11835, Egypt
7 Department of Computer Science, College of Sciences and Humanities-Aflaj, Prince Sattam bin Abdulaziz University, Saudi Arabia

* Corresponding Author: Mesfer Al Duhayyim. Email: email

Computers, Materials & Continua 2023, 74(3), 5251-5265. https://doi.org/10.32604/cmc.2023.032729

Abstract

Autism Spectrum Disorder (ASD) refers to a neuro-disorder where an individual has long-lasting effects on communication and interaction with others. Advanced information technology which employs artificial intelligence (AI) model has assisted in early identify ASD by using pattern detection. Recent advances of AI models assist in the automated identification and classification of ASD, which helps to reduce the severity of the disease. This study introduces an automated ASD classification using owl search algorithm with machine learning (ASDC-OSAML) model. The proposed ASDC-OSAML model majorly focuses on the identification and classification of ASD. To attain this, the presented ASDC-OSAML model follows min-max normalization approach as a pre-processing stage. Next, the owl search algorithm (OSA)-based feature selection (OSA-FS) model is used to derive feature subsets. Then, beetle swarm antenna search (BSAS) algorithm with Iterative Dichotomiser 3 (ID3) classification method was implied for ASD detection and classification. The design of BSAS algorithm helps to determine the parameter values of the ID3 classifier. The performance analysis of the ASDC-OSAML model is performed using benchmark dataset. An extensive comparison study highlighted the supremacy of the ASDC-OSAML model over recent state of art approaches.

Keywords


1  Introduction

Autism Spectrum Disorder (ASD) was a neuro-developmental ailment that makes persistent deficiency in social interaction behavior and skills of children. According to Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) [1], social communication skills have been defined as 1) deficits in non-verbal interactive behavior, 2) deficits in understanding, developing, and maintaining relations 3) deficits in social emotional reciprocity [2]. Moreover, deficits in conduct were described as limited and repeated behaviour patterns and fixated interest between children having autism, which mentioned firstly repeated motor movements or stereotyping; secondly insistence on sameness, problems having variations in rigid outlines of nonverbal or verbal behavior or routine; thirdly fixated interest and finally unusual reply to sensory prospects [3]. Children having sensory problems might contain hypo sensitiveness or hyper sensitiveness to an extensive array of senses namely smells, sights, tastes, touch, sounds, body awareness, and balance. As an instance, children undergoing hypersensitiveness to noises may discover sounds which arise from air-coolers as disturbing [4,5]. Also, other problems habitually refer to sensory problems were swinging back and forth, flailing of the arms or hands, self-harm, and walking on tiptoes.

Autism diagnosis needs substantial amount of cost and time. Detection of autism at an initial stage could be very helpful for the victim counselling patients with correct treatment in the initial level [6]. This actually prevents the condition of patient from worsening and will aid in reducing long-term charges related with deferred prognosis. Hence timely, correct and simple screening test tools are highly necessary that will forecast autism traits in person and detect whether they no need or need complete autism valuation [7,8]. For improving the process of diagnosis of ASD, authors currently initiated implementing machine learning (ML) intellectual approaches. The main goal of such ML works on ASD is enhancing diagnosing period for providing faster accessibility to medical services, enriching accuracy of prognosis, and diminishing dimension of the input data because for identifying the ASDs highest ranked features [9,10]. ML can be referred to a research domain which complies artificial intelligence (AI) search approaches, mathematics, and other sciences for extracting precise prediction methods from datasets. ML approaches namely decision tree (DT), neural network (NN), rule-based classifier, and support vector machine (SVM), were automatic tools that usually need minimum human interference at the time of data processing [1113].

In [14], the authors focused on revealing the pattern between normal and autistic children by using electroencephalogram (EEG) through the deep learning (DL) technique. The brain signal dataset utilized pattern detection where the extracted feature undergoes the multilayer perceptron (MLP) network for the classification technique. The authors in [15], developed DL method for prognosis of ASD from functional brain network built using brain functional magnetic resonance imaging (fMRI) dataset. The whole Autism Brain Imaging Dataset Exchange 1 (ABIDE 1) is applied for investigating the efficiency of the presented technique. Firstly, we constructed the brain network from brain fMRI image and determines the raw feature according to brain network. Next, we applied an autoencoder (AE) for learning the advanced feature from the raw feature. Then, they study trained a deep neural network (DNN) using the advanced features.

In [16], three AI techniques have been introduced such as ML, DL, and hybrid techniques among themselves, for earlier diagnoses of autism. In [17], the researchers presented deep multi-modal models that learn a joint description from two kinds of datasets provided using fMRI scans. Integrating two functional imaging modalities in an automatic end-to-end autism diagnoses technique provides widespread images of the neural action, and thus allows for precise diagnosis. The researchers in [18] employ a DL technique from convolutional neural network (CNN) variant to identify the patient is ASD or non-ASD and extracts the strong features from neuro-images in fMRI. Next, it explains the efficiency of pre-processed images through accuracy for classifying the neural pattern.

This study introduces an automated ASD classification using owl search algorithm with machine learning (ASDC-OSAML) model. The proposed ASDC-OSAML model majorly focuses on the identification and classification of ASD. To attain this, the presented ASDC-OSAML model follows min-max normalization approach as a pre-processing stage. Next, the owl search algorithm-based feature selection (OSA-FS) model is used to derive feature subsets. Then, beetle swarm antenna search (BSAS) algorithm with Iterative Dichotomiser 3 (ID3) classification technique was implied for ASD detection and classification. The performance analysis of the ASDC-OSAML model is performed using benchmark dataset.

2  The Proposed ASD Model

In this study, a new ASDC-OSAML approach was advanced for the identification and classification of ASD. The presented ASDC-OSAML model follows min-max normalization approach as a pre-processing stage. Next, the OSA-FS model is used to derive feature subsets. Then, BSAS algorithm with ID3 classification technique has been implemented for ASD detection and classification. Fig. 1 depicts the overall block diagram of ASDC-OSAML approach.

images

Figure 1: Overall block diagram of ASDC-OSAML approach

2.1 Stage 1: Process Involved in OSA-FS Model

At the initial stage, the OSA-FS model is used to derive feature subsets. Like other nature-inspired population related techniques, OSA initiates the optimization technique using an initialized solution set that characterizes the initial location of owls in forest (d dimension searching space) [19].

When n number of owls in the forest, then the arbitrary location has been stored in n×d matrixes in the following:

O=[O1,1O1,2O1,dO2,1O2,2O2,dOn,1On,2On,d](1)

In Eq. (1), matrix component Oi,j signifies the jth parameter of ith owl. A uniform distribution is utilized for allocating the initialized position of all the owls in the forest.

Oi=OL+U(0,1)×(OUOL)(2)

In Eq. (2), OL and OU indicates lower and upper limits correspondingly, of ith owl Oi in jth parameter and U(O,1) is arbitrary value lies within [0, 1]. The fitness of all the owl’s positions in the forest can be calculated by the objective function and saved in the subsequent matrixes:

f=[f1([O1,1,O1,2O1,d])f2([O2,1,O2,2O2,d])fn([On,1,On,2On,d])](3)

Here, it can be considered that fitness value of all the owl locations straightforwardly refers the intensity data get by the ears. Therefore, better owl receives  max  intensity (for maximizing problem) since it can be closer to vole. The normalized intensity data of ith owl was applied for updating the location and it is evaluated by the following equation:

Ii=fiwbw(4)

where

b=maxkϵ1,,nfk(5)

w=minkϵ1,nfk(6)

The distance of prey and owl can be evaluated as follows:

Ri=Oi,V2(7)

In Eq. (7), V indicates the position of prey that is accomplished using the fittest owl. Also, it was considered that one vole (global optimal) in the forest was there. Owl takes silent flight when moving to the prey. Therefore, they receive changed intensity following the inverse square law of sound intensity:

Ici=IiRi2+Random noise(8)

Here, Ri2 is utilized rather than 4πRi2 and noise of environment is assumed for making the arithmetical model. Here, vole is active, and therefore the movement forces the owl to change the existing location silently. Here, the movement of prey was intended by utilizing probability and therefore novel position of owl is attained by:

Oit+1={Oit+β×Ici×|αVOit|,ifpvm<0.5Oitβ×Ici×|αVOit|,ifpvm0.5(9)

In Eq. (9), Pvm denotes the probability of vole movements, α refers to a random integer within [0,0.5] and β was a linearly reducing constant from 1.9 to 0. β present larger changes and promote the exploration of searching space. Since the model progress, the variation is decreased for encouraging exploitation. The presented technique has only one user determined variable (β) where genetic algorithm (GA), particle swarm optimization (PSO), bat algorithm (BA), and so on, have larger amount of parametric settings. Fig. 2 depicts the steps involved in OSA.

images

Figure 2: Steps involved in OSA

The fitness function of the OSA-FS model was devised to maintain a balance among the quantity of features which was chosen in every solution (minimal) and the classification accuracy (maximal) acquired with the help of such selected features, Eq. (10) denotes the fitness function for evaluating resolutions.

Fitness=αγR(D)+β|R||C|(10)

where γR(D) signifies the classifier error rate of a presented classifier (the ID3 classifier was utilized). |R| refers the cardinality of selected subset and |C| means aggregate number of features in datasets, α and β were 2 parameters respective to the significance of classifier quality and subsets length. ∈ [1, 0] and β=1α.

2.2 Stage 2: ASD Classification Model

Once the features are chosen, the ID3 classification model is applied for ASD detection and classification. The ID3 approach chooses testing components with relating and computing their information gain (IG). Consider S indicate the group of data instances. The C class component has m dissimilar values that indicate m class labels Ci(i=1,2,,m). Given that Si be the number of samples from class Ci(i=1,2,,m). The predicted data amount for categorizing S as follows:

I(S1,S2,,Sm)=i=1mpilog2pi(11)

In Eq. (11), pi indicates the possibility of instance from S suitable for class Ci. I(S1,S2,,Sm) indicates the average required data amount for recognizing the class labels to all the instances from S.

Consider the component A has v dissimilar values {a1,a2,,aν} from the S trainable dataset. Once A is a nominal component, then, the component splits S as v subset so that {S1,S2,,Sν}, in that Sj describes the set of S where samples from Sj has the comparable component values aj on A. However, sample from Sj might have different class labels. Consider Sij indicates the group of samples that class labels are Ci from the set of {Sj|A=aj,j1,2,,ν,SjS} wherein component A=aj. The required amount of information to split the trainable dataset S was evaluated as follows:

E(A)=j=1ν((s1j+s2j++smj)s×I(s1j,s2j,,smj))(12)

The minimal data amount required, an additional purity of sub dataset can be

I(s1j,s2j,,smj)=i=1mpijlog2(pij)(13)

In Eq. (13), pij denotes the probability of instance from Sj based on class Ci. I(s1j,s2j,,smj) denotes the average dataset amount required for recognizing the class label to all the instances from Sj.

InfoGain(A)=I(S1,S2,,Sm)E(A)(14)

Especially, the amount of data needed (based on the class) minus the amount of novel dataset needed (depends on component A). Selection of the component using maximal InfoGain(A) as testing component that is assigned to internal nodes from DT. Here, the amount of data needed to categorize sample is minimal.

2.3 Stage 3: Parameter Tuning

In this study, the design of BSAS algorithm helps to determine the parameter values [2022] of the ID3 classifier. The original beetle antenna search (BAS) involves searching and detecting behaviors [23]. In every timestep, beetles move in a random direction. Thus, a random unit vector bRN is utilized for describing the direction. The coordinate of right-and left-hand sides of the beetle antennae as follows,

xr=xt+dtb,xl=xtdtb(15)

In Eq. (15), the subscript r,l characterizes the right- and left- hand sides correspondingly, the superscript t characterizes certain moments. d are behalf of distance from the antenna to the centroid of the beetle. Especially, dt signifies beetle searching region at a specific moment, and the region will attenuate over time. d0 guarantees that dt won’t decrease to zero. Moreover, magnitude of d0 based on the scaling of certain problems. The beetle detection behavior is defined by,

xt=xt1+δtbsign(f(xr)f(xl))(16)

In Eq. (16), δt indicates the step size that reduces over time as follows. The updating rule of d and δ are given as follows,

dt=ηddt1+d0(17)

δt=ηδδt1+δ0.(18)

From the expression, ηd and ηδ indicates attenuation coefficient of antennae length d and step size δ correspondingly. The presetting of d and δ parameters seriously influences the performance of BAS.

Generally, BAS technique has two major disadvantages. Firstly, beetles move in one random direction. It could not assurance that the move of beetle will make the objective function better. Similarly, we enhance the searching behavior of BAS technique by using k beetle to move in k direction, which improves the probability to search best location for beetles. Next, all the movements of beetle cause a step size and update of the position. Indeed, when the objective function is better, the location of beetle must be upgraded when the step size not. As a result, we designed a feedback-based location and step-size update approach. Additionally, a pδ probability constant is presented for measuring the effect of random direction. In another word, we assume there is a pδ smaller probability that k beetle will miss the best position (variable subset) for objective function at the present step size. Thus, we produce a random value lies within [0,1] and compared them to pδ. Consequently, when k beetle could not find small objective function value, BSAS approach assumes there is no best location at existing step size and it should be upgraded. In some instances, the approach assumes there are still few locations to fulfill beetle requirement for minimizing the objective, however, the beetle could find it due to limited beetle number k. Hence, sensing length d and step-size δ remains unchanged when the arbitrary number is lesser than pδ.

3  Experimental Validation

The proposed model is simulated using Python tool. The experimental validation of the ASDC-OSAML model is tested using three datasets, as given in Table 1.

images

Fig. 3 shows the best cost inspection of the OSA-FS with other FS models. The figure implied that the OSA-FS model has resulted in effectual outcomes over other FS models with minimal best cost.

images

Figure 3: Best cost analysis of OSA-FS approach with other FS models

Fig. 4 highlights the confusion matrices formed by the ASDC-OSAML model on the test data. With ASD-children dataset, the ASDC-OSAML model has recognized 140 samples into Yes class and 151 samples into No class. Meanwhile, with ASD-adolescent dataset, the ASDC-OSAML approach has recognized 62 samples into Yes class and 41 samples into No class. Eventually, with ASD-adult dataset, the ASDC-OSAML technique has recognized 189 samples into Yes class and 506 samples into No class.

images

Figure 4: Confusion matrices of ASDC-OSAML approach (a) ASD-children dataset, (b) ASD-adolescent dataset, and (c) ASD-adult dataset

Table 2 provides an overall ASD classification outcomes of the ASDC-OSAML model on test data.

images

Fig. 5 reports a brief result analysis of the ASDC-OSAML model on the test ASD_childern dataset. The ASDC-OSAML model has identified Yes class with accuy of 99.66%, sensy of 99.29%, specy of 100%, Fscore of 99.64%, and area under the precision-recall curve (AUPR) of 99.65%. Also, the ASDC-OSAML algorithm has identified No class with accuy of 99.66%, sensy of 100%, specy of 99.29%, Fscore of 99.67%, and AUPR of 99.65%. In addition, the ASDC-OSAML methodology has identified with average accuy of 99.66%, sensy of 99.65%, specy of 99.65%, Fscore of 99.66%, and AUPR of 99.65%.

images

Figure 5: Average analysis of ASDC-OSAML approach on ASD_children dataset

Fig. 6 demonstrates brief outcome scrutiny of the ASDC-OSAML technique on the test ASD_adolescent dataset. The ASDC-OSAML approach has identified Yes class with accuy of 99.04%, sensy of 98.41%, specy of 100%, Fscore of 99.20%, and AUPR of 99.21%. Besides, the ASDC-OSAML method has identified No class with accuy of 99.04%, sensy of 100%, specy of 98.41%, Fscore of 98.80%, and AUPR of 99.21%. Moreover, the ASDC-OSAML algorithm has identified with average accuy of 99.04%, sensy of 99.21%, specy of 99.21%, Fscore of 99%, and AUPR of 99.21%.

images

Figure 6: Average analysis of ASDC-OSAML approach on ASD_adolescent dataset

Fig. 7 signifies a brief result analysis of the ASDC-OSAML algorithm on the test ASD_adult dataset. The ASDC-OSAML method has identified Yes class with accuy of 98.72%, sensy of 100%, specy of 98.25%, Fscore of 97.67%, and AUPR of 99.13%. Additionally, the ASDC-OSAML approach has identified No class with accuy of 98.72%, sensy of 98.25%, specy of 100%, Fscore of 99.12%, and AUPR of 99.13%. Moreover, the ASDC-OSAML technique has identified with average accuy of 98.72%, sensy of 99.13%, specy of 99.13%, Fscore of 98.40%, and AUPR of 99.13%.

images

Figure 7: Average analysis of ASDC-OSAML approach on ASD_adult dataset

Fig. 8 presents the accuracy and loss graph analysis of the ASDC-OSAML method under different datasets. The results show the accuracy value tends to rise and loss value tends to reduction with an increase in epoch count. It can be observed that the training loss is low and validation accuracy is high on different datasets.

images

Figure 8: (a and b) Graph of Accuracy and loss on ASD_children dataset (c and d) Graph of Accuracy and loss on ASD_adolescent dataset (e and f) Graph of Accuracy and loss on ASD_adult dataset

Table 3 illustrates a comparison study of ASDC-OSAML model with recent models such as quasi-oppositional dragonfly with deep stacked autoencoder network (QODF-DSAN), logistic regression (LOR), neural network (NN), k-nearest neighbour (KNN), and SVM-linear model [24,25].

images

Fig. 9 renders a comparative review of the ASDC-OSAML system with other models interms of sensy and specy. The figure depicted the LOR and NN methodologies have shown lower values of sensy and specy At the same time, the KNN and SVM-linear techniques have reported moderately enhanced sensy and specy values. Though the QODF-DSAN approach has accomplished reasonable sensy and specy of 97.05% and 96.77%, the ASDC-OSAML method has reached higher sensy and specy of 99.65% and 99.65%.

images

Figure 9: Sensy and specy analysis of ASDC-OSAML approach with recent methodologies

Fig. 10 provides a comparative inspection of the ASDC-OSAML model with other models interms of accuy. The figure indicated that the LOR and NN models have shown lower values of accuy. At the same time, the KNN and SVM-linear models have reported moderately enhanced accuy values. Though the QODF-DSAN model has accomplished reasonable accuy of 97.81%, the ASDC-OSAML model has gained higher accuy of 99.66%. From the detailed results and discussion, it is apparent that the ASDC-OSAML model has resulted in maximum classification performance over recent models.

images

Figure 10: Accuy analysis of ASDC-OSAML approach with recent methodologies

4  Conclusion

In this paper, a new ASDC-OSAML approach was advanced for the classification and identification of ASD. The presented ASDC-OSAML model follows min-max normalization approach as a pre-processing stage. Next, the OSA-FS model is used to derive feature subsets. Then, BSAS algorithm with ID3 classification method was implemented for ASD detection and classification. The design of BSAS algorithm helps to determine the parameter values of the ID3 classifier. The performance analysis of the ASDC-OSAML model is performed using benchmark dataset. Extensive comparison study highlighted the supremacy of the ASDC-OSAML model over recent state of art approaches. Thus, the presented ASDC-OSAML technique was applied as an effectual tool for ASD classification. In future, an ensemble of three DL approaches has been applied to boost the classifier results.

Funding Statement: The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through Large Groups Project Under Grant Number (61/43). Princess Nourah bint Abdulrahman University Researchers Supporting Project Number (PNURSP2022R114), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code: (22UQU4310373DSR26).

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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Cite This Article

H. A. Mengash, H. Alqahtani, M. Maray, M. K. Nour, R. Marzouk et al., "Automated autism spectral disorder classification using optimal machine learning model," Computers, Materials & Continua, vol. 74, no.3, pp. 5251–5265, 2023.


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