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<title-group><article-title>Soft Computing Fusion with Applications</article-title></title-group>
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<sec><title>Abstract</title><p>The Rényi entropy function was optimi z ed for the novel findings of this investigation under various conditions. Their research&apos;s findings suggest that generalized t - distributions cover the complete spectrum of Lévy stable Additionally, an exposition was undertaken to prove that the Lévy distribution generalizes the Tsallisian distribution rather than the reverse. The current study is a strong generalization of an existing research work in the literature.</p>
<p>Notable entropic applications to machi ne learning are addressed. Concluding remarks are given, combined with some strong open problems and future research pathways .</p>
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<sec><title>Keywords:</title><p>Shannon entropy functional, Rényi entropy functional, Tsallis non - extensive entropy functional, Lévy stable distributions, Machine .</p>
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<sec><title>1 Introduction</title><p>The most justifiable version of information entropy is the Rényi entropy with a free Rényi non - extensivity parameter q, and the Tsallis entropy can be thought of as a linear approximation [1] to the Rényi entropy when q ? ? . When  ? ? , the Boltzmann - Shannon entropy function replaces both other entropy functions. When the Rényi entropy functional is subjected to the Maximum Information Entropy (MEP) principle, the result is the microcanonical ( Homogenous ) distribution for an isolated system. The Boltzmann entropy functional replaces the Rényi entropy functional in this situation, which supports the universality of Boltzmann&apos;s principle of statistical mechanics, regardless of the value of the Rényi paramet er q .</p>
<p>The need for non - extensive statistics based on Tsallis&apos; information entropy is critical , given its quick development. The one - parameter family of Rényi entropies ( Or just Rényi entropy) seems to be the most rational one [2] . The well - known Boltzmann - Shannon entropy functional replaces the Rényi entropy Corresponding Author: drismail664@gmail.com https://doi.org/10.22105/scfa.v1i2.33 2021.281500.1061 Licensee System Analytics . This article is an open - access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0).</p>
<p>Tsallis «  functional when the Rényi parameter q is equal to unity. The non - extensive Tsallis&apos; entropy functional is produced by linearizing the extended Rényi entropy functional in the vicinity [2] of a point q  ? ? . When the principle of Maximum MEP is applied to the Rényi entropy functional of an isolated system. At this phase, the Rényian functional reduces to the Boltzmannian functional, thus enforcing the Boltzmann principle from which all thermodynamic properties of extensive and non - extensive Hamiltonian systems can be deduced.</p>
<p>The measure of information in this example of a system &apos;s incomplete statistical descriptor with the help of probabilistic distribution is called the information entropy functional, or just entropy  ? ?  ? ? ? ? ?  ? ? ? ?  ? ? ? ? ?  ? Boltzmann - Shannon representation of the entropy functional is the most well - known to read as in Eq . (1) : ? ? ?  ?  ? ?  ?   ? ? (1) ? ? ? The entropy ?</p>
<p>correlates with the thermodynamic entropy functional in the situation given, where the  ?  is the system&apos;s macroscopic equilibrium state , and the subscripts   denote dynamic microstates in the Gibbs phase space. This entropy function was justified by [2 ] ² [ 4] based on a system of axioms presented in a theorem form. Their axioms were analyzed in [2 ] ² [ 4] where it was shown that a uniquely determined Boltzmann - Shannon entropic form is provided by a quite artificial axiom related to a form of conditional entropy functional ( That is, the entropy functional of a subsystem of a system being in a prescribed state).</p>
<p>On another strong note, [ 3 ] examined several papers on this topic and discovered that the Shore and Johnson [6] axiom system, which results in the Rényi entropy function [4] , follows Eq . (2) : ? ? ? ? ?  ? ? ?  ? ?    ? ?  ? ? ?  ? ? ? ? (2) ? ? ? ?  ? ? ? ? ? ? The Rényi entropy functional, which is a mathematical measure , was used to quantify the amount of information or disorder in a system. It mentions that q (c.f., Eq .</p>
<p>(2) ) must be positive and not less than zero. The properties and characteristics of Rényi entropy functional are further explored in related literature [4 ] ² ? ? ? [ 6] . Among its basic properties, we may mention positivity (  ? ? ? ), concavity for  ? ? ?  and in ? addition   ? ? ?  ? ? ? ? ? In the case of ? ? ? ? ?  ? ? ? ? ( Which , in view of the normalization of the distribution  ?</p>
<p> ? ? corresponds to  the condition  ? ? ?  ? ? ? ? , one can restrict oneself to the linear term of the logarithm in the expression for ? ? ? ? ? ? ? ?  ? over this difference and ? ?  ? changes to the defined form of Eq . (3) . ? ? ? ?  ? ? ?  ? ?  ? ? ? ? ? ?  ? ? ? (3) ? ? ? ?  ? ? ? S uch a linearization of the Rényi entropy functional was proposed by [11 ] , [ 12] ; at this time, the Tsallisian case had come into existence by [12] .</p>
<p>The entropy functional stops being exhaustive due to logarithm linearization. To examine a range of non - extensive systems, Tsallisian followers have extensively utili z ed this quality [7 ] ² [ 15] . In doing so, the constraint ? ? ?  ? ? ? mentioned above is typically ignored. According to MEP , when describing a system statistically, its distribution function should accurately represent the average quantities observed in the system. If these quantities are not known, the distribution function should be as indeterminate as possible. This approach has been widely used in constructing equilibrium statistical thermodynamics for isolated or weakly interacting thermodynamic systems.</p>
<p> A Mageed | Soft. Comput. Fusion. Appl . 1 ( 2 ) ( 2024 ) 91 - 102 Gibbs ensembles [1 ] ² [ 5] were widely used as a statistical approach to accurately represent average quantities observed in a system, as they are commonly used in constructing equilibrium statistical thermodynamics for isolated or weakly interacting thermodynamic systems. The infor mation entropy functional, commonly referred to as the Boltzmann - Shannon entropy functional, is traditionally used to quantify the disorder or uncertainty in a system.</p>
<p>This theorem introduces as it reads a new physical interpretation: As Rényi entropy functional is more general than both Shannon and Tsallis, since Rényi entropy functional reduces to Shannon case as the parameter  ? ? ?  and that Rényian entropy functional &apos; s linearization about a point q  ? ?  is the Tsallisian entropy functional. This leads to a newer ground in information theory ; we could represent it by the following Fig.</p>
<p>1 : Fig. 1. A new cornerstone to information theory. In other words, this could be read as employing the Rényi entropy function to research any concept would generate the special case of Shannon case as  the parameter   ? ? , and would reduce to the Tsallis case if we carry out the linearization of the Rényi entropy function in the neighbourhood of a point    ? ? ? Shannon entropy, sometimes referred to as Gibbs entropy in statistical physics, is a measure of disorder in a system. As an alternative to Gibbs entropy, Tsallis developed a non - extensive entropy [8] , [10] , indexed by  , which results in an infinite family of Tsallis non - extensive entropies. While Tsalli s&apos;</p>
<p>s non - extensive entropy produces type II generali z ed Lévy stable distributions with heavy tails that obey power laws, Gibb s&apos; s entropy produces exponential distributions. It is important to remember that Tsallis entropy is equivalent to Havrda - Charvat&apos;s structural  - entropy [9] , but the non - extensive mechanics community frequently ignores this relationship. Additionally, rather than the other way around, Tsallis distributions are derived from Lévy The current paper contributes to: I.</p>
<p>The current study is a strong generalization of an existing research work in literature . II. The provision of entropic applications to machine learning. III. The exposition of several open problems. The flowchart of the provided work reads as follows : I. I ntro duction and literature review II.</p>
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<sec><title>Results</title><p>III. E ntropic application to ma chine le a rning IV. Conclu s ion , open prob lems , and future research pat h ways</p>
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<sec><title>2 Results</title><p>We&apos;ll talk about how four different generali z ed t - distribution types can be derived from the definitions of Rényi entropy functional. The Lagrangian equation of the calculus of variations, a mathematical technique for optimi z ing functions subject to restrictions, is used to reach these conclusions. According to the author&apos;s analysis, these discoveries are brand - new, and they are presented.</p>
<p>Result 1 Rényi entropy functional can be optimized under Eq . (4) : Tsallis «  ? ?  ? ? ? ? (4) ? ? ? Under the defined constraint of Eq . (5) : ?  ? ? ?  ? ?  ? ? ?  ? (5) We have the Lagrangian function ?  to be as in Eq . (6) : ? ?  ? ? ? ? ? ?   ? ?  ? ? ? ? ? ?  ? ? ?  ? ? ? ? ?  ? ? ?  ? ?  ? ? ?   ? ? ? (6) ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ? implies . ? ? ? Hence by Eq .</p>
<p>(7) ,   ? ? ? ? ? ?  ? ? ? ? (7) ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ? ? ? ?  ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ? i.e., by Eq . (8) : ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (8) ? ? = ? ? ? ? ? ? ? ?  ? ?  ? ? ? ? ? ? ? ? ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Defining Eq . (9) to be: ? ? ?  ? ? ? ? ? ? ? ? ? ? ?  ? ? ? ? ? ? ?  ?  ?  ? ?  ? ?  ?  ? (9) ? ? ? ? ? ?   ?</p>
<p>? ?  ? ? ? Hence, clearly , it follows by Eq . (10) that   ? ?  ? (10) ? ? ? ? ?  ?  ? ? where ? ? ?  ? ? ?  ?  ?  ?  ? ? ?  ? ? ? ? ?  ? ? ? Result two We have two constraints, by Eq . (4) . S ubject to that defined by Eq . (11) : ? ? ? ? ?  ?  ?  ? ?   ? (11) ? ? ? ? We have the Lagrangian function ?  to be as in Eq . (12) : ? ? ?  ? ? ? ? ? ? ?   ? ?  ? ? ? ? ? ?  ?</p>
<p>? ?  ? ? ? ? ? ? ?  ?  ?  ? ?   ? ? ? (12) ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ?  A Mageed | Soft. Comput. Fusion. Appl . 1 ( 2 ) ( 2024 ) 91 - 102 ? ? ? ? implies Eq . (13) : ? ? ?   ? ? ? ? ? ?  ? ? ? ? ? ? ? (13) ? ? ? ?  ? ? ? ? ? ? ? ? ?  ? ? ? ? ? ? ?  ?  ? ? ? ? ? ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ? Hence, Eq . (14) follows:   ? ? ? ?  ? ? ? ? ?  ? ? ? ? ? ? (14) ? ? ? ? ?</p>
<p>? ?  ? ?  ? ?  ? ? ? ? ? ? ? ? ? ? ? ?  ?   ? ? ? ? ? Thus, one gets Eq . (15) : ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?     ?   ? ? ? ? ?  ? ?     ?  ? ? ? ? ?  ? ?  ?  . (15) ? ? ? ? ? ? ? ? ? ? ? Hence, we have Eq . (16) to take the form:   ? ?  ? (16) ? ? ? ? ? ? ?   ? ?? ? ? where ? ? ?  ? ? ?  ?  ?  ?  ? ? ?  ? ? ? ?  ? ? ? Because these are partially related through Eq s.</p>
<p>(4) , ? ? ? (11) and (16) generate Tsallis distribution [8] for  ? ? ? Result three Following our approach as above is subject to the two constraints, as defined by Eq . (4) and, after prescribing Eq . (17) : ? ? ? ?  ?  ? ?  ? ?  ? (17) ? ? ? The reader can check that after a few algebraic steps, the solution is in the closed - form representation defined by Eq . (18) :   ? ?  ? (18)</p>
<p>? ? ? ? ?  ?  ? ? Such that Eq . (19) holds: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?   ? ? ?  ? ?  ?  ?  ?  ? (19) ? ? ? ? ? ? ? ? ? ? ? ? ? where ? ? ?  ? ? ?  ?  ?  ?  ? ? ?  ? ? ? ? ?  ? ?  ? ? ? ? ? ? ? ?  are the Lagrangian multipliers. Eq . (17) defines the variance. Result four Following our approach as above is subject to more complex constraints, as by Eq . (4) . Combined with the recalled Eq .</p>
<p>(11) an d the communicated Eq . (17) . After a few algebraic steps, the reader can check that by optimizing Rényi &apos; s entropy functional subject to Cons traints (4), (11) and (17) , the reader can check that after few algebraic steps, the solution is in the closed form representation, as prescribed by Eq . (20) : ? ? ?  ?  ? ?  ? ?   ? ? ? (20) ? ? ?  ?  ? ? Tsallis «  Exposing the parametric representation of Eq .</p>
<p>(21) : ? ? ? ? ? ?  ? ? ? ? ? ?  ? ? ? ? ? ? ? ? ? ? ?  ? ? ?  ? ?  ?  ?  ? ? ?  ?   ?  ? (21) ? ?   ? ? ?   ?  ? ? ? ? ? ? ? ? ?? ? ? where ? ? ?  ? ? ?  ?  ?  ?  ? ? ?  ? ? ? ?  ? ? ? ? ? ? ? ?  are the Lagrangian multipliers. The variance ? ? ? ? ? ? corresponds to   ?  ? , Eq . (17) defines the variance. We can see that for  ? ? ? ? ? ?  Eq . (20) reduces to Tsallisian [8] as a special case.</p>
<p>By Eq . (20) , we have for small values of ? ? ? , Eq . (22) , follows: ? ? ? ? ? ? ? ? ? ? ?  ? ?   ? ? ?  ? ? ? ?  ?  ? ?  ? ? . (22) ? ? ? ? ? ? ? ? Carrying out the same analysis, we have for large values of ? ? ? , as read by Eq . (23) : ? ? ?  ? ?  ? ?  ?  ? ?  ? ? . (23) This is summarized in the more compact form, as defined by Eq . (24) : ? ? ?  ? ? ? ?  ?  ? ?  ? ?  ?  ?</p>
<p>?  ? ?                          ?  ? ?  ? ?  ? ? ? (24) ? ? ?  ? ?  ?  ? ?  ? ?    ?     ? ?  ?  ?                            ?  ? ? The Probability Density Functions (PDFs), given by Eq . s (10) , (16) , (18) , and (20) , refer to generalized t - distributions, which exhibit polynomial tails for small values of x and power law tails for large values of x.</p>
<p>These distributions encompass the entire range of Lévy stable distributions, which are commonly used to model extreme eve nts and heavy - tailed phenomena. Specifically, Eq . (10) represents the PDFs for small values of x, while Eq . (20) represents the pdf for large values of x. This implies Eq . (25) ?  ? ? ?  ?  ? ? ?  ? ?  ?   ?               ?  ? ?  ?  ? ? ? ? ?</p>
<p>(25) ?   ?  ?  ? ? ?   ? ?  ? ?                       ?  ? ? where  ? ? ? The outcomes for Eq . s (16) , (18) and (20) are comparable. Since the Lévy distributions can be represented by the generali z ed t - distributions, as obtained by Eq . s (10) , (16) , (18) , and (20) , the density functions that can be obtained from Rényi entropy functional are even broader. It is clear from the analysis done and reported in Eq .</p>
<p>(24) , for Eq . (20) , that the case is still relevant</p>
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<sec><title>3 Entropic Applications to Machine Learning</title><p>Feature selection [16] in machine learning involves identifying the most relevant and predictive features while excluding irrelevant or redundant ones. Information theory, specifically mutual information measuring the correlation between features and labels, is commonly used for this purpose. The exploration of using Rényi min - entropy for feature selection, showing that in practical experiments with real datasets, the Rényi - based algorithm tends to outperform the traditional Shannon - entropy - based approach in terms of performance, was extensively undertaken by [16] .</p>
<p>In a more detailed perspective, the authors of [16] have provided a method for feature selection based on Rényi min - entropy, which is a measure of uncertainty in information theory. Additionally, it was shown that selecting the optimal set of features using min - entropy is computationally challenging (NP - har d) and proposes an iterative strategy to approximate the best feature subset efficiently [16] . The study [16] compared this approach with one based on Shannon entropy and demonstrate d through experiments that the Rényi - based algorithm performs better in practice across different datasets.</p>
<p> A Mageed | Soft. Comput. Fusion. Appl . 1 ( 2 ) ( 2024 ) 91 - 102 In this context, a dataset with 32 classes and 8 features is divided into two types [16] , and &apos;, as showcased by F ig . 2 (c.f., [16] ). Each type consists of 4 features. At a specific step in the process, the algorithm based on ? Shannon entropy selects a set of features,  ? = {  ? ?  ? ?  ? }, as one of the possible outcomes [17] . This selection is a result of the algorithm&apos;s approach to feature selection based on the information content provided by Shannon entropy.</p>
<p>In the context of feature selection in machine learning [16] , the text discusses the comparison between Rényi min - entropy and Shannon entropy algorithms. The explains that while the Rényi algorithm [16] may require additional steps to achieve complete accuracy in classification, the Shannon algorithm can stop when the classification is already completely accurate based on residual entropy and Bayes error. The comparison highlights that the choice between the two algorithms depends on the desired level of accuracy in the classification task [16] .</p>
<p>Fig. 2. Features ? ( Left ) and ? &apos; ( Right ). When dealing with Artificial Neural Networks (ANN s ), the complexity increases due to numerous parameters that can impact the network&apos;s structure [18] . To address this, the authors utilized Bayesian opti mization . This method combines extensive search with Gaussian processes to determine the best parameters for the ANN model, such as the number of hidden layers, neurons per layer [18] , learning rate, batch size, and epochs. By incorporating the Spearmint Bayesian optimization codebase and optimizing these parameters, they aimed to create a model that generalizes well and maximizes accuracy through a 10 - fold cross - validation process bef ore testing on unseen data [18] .</p>
<p>It is worth noting that, Iin [16] the study, a bootstrap procedure with 5 iterations was used to shuffle data and ensure the results were independent of the specific training, validation, and test set split. Each iteration involved a new experimental run with different training - test set sp lits. Features were selected based on the training set using Shannon and Rényi min - entropy methods, with each iteration adding one selected feature at a time for a total of 50 steps. The models were trained and tested on the test set after hyper - parameter tuning with 10 - fold cross - validation, demonstrating the effectiveness of Rényi min - entropy in feature selection, particularly with the BASEHOCK dataset.</p>
<p>This explains that after conducting multiple iterations of feature selection using Rényi min - entropy and Shannon entropy methods, the average performance was computed and presented in Figs. 3 , 4 and 5 (c.f., [16] ). The results consistently showed that the feature selection approach based on Rényi min - entropy generally outperformed the Shannon entropy method, particularly when analyzing the BASEHOCK dataset.</p>
<p>Tsallis «  Fig . 3. Comparison of the accuracy of artificial neural networks and support vector machine classifiers on the BASEHOCK dataset using different feature selection methods, specifically Shannon entropy and Rényi min - entropy . The results show that the feature selection method based on Rényi min - entropy generally yielded better performance compared to Shannon entropy, particularly with the BASEHOCK dataset, indicating the effectiveness of Rényi min - entropy in improving classific ation accuracy in machine learning tasks.</p>
<p>Fig. 4. The results show that the Rényi min - entropy feature selection method generally outperformed Shannon entropy, particularly evident with the BASEHOCK dataset. Tsallis «  a. b. c. Fig. 7. Overview architecture of RISE ; a. Variational autoencoder model for embedding observations , b . K - value searching , c . Generation of intrinsic rewards, where k - NN is the k - nearest neighbour and _ denotes the Euclidean distance.</p>
<p>In the context of the conducted research in [20] , the text refers to using a grid - based environment called Maze2D to showcase the effectiveness of Rényi state entropy - driven exploration. Maze2D is a simple example used to demonstrate how this exploration method works in navigating through a maze with th e goal of finding the shortest path from the start point to the endpoint, emphasizing the efficiency of the approach in this scenario, as depicted by Fig.</p>
<p>8 (c.f., [21] ). In the maze game scenario described, the agent can move in four directions - left, right, up, and down - aiming to find the shortest path from the start point to the endpoint. Additionally, the agent can teleport from one portal to another identical mark wit hin the maze. The experimental setting involves using the Q - algorithm to navigate through mazes of varying sizes, updating the Q - table at each step to enhance training efficiency and achieve optimal exploration performance.</p>
<p>Fig. 8. A maze game with a grid size of 20 ? 20.  A Mageed | Soft. Comput. Fusion. Appl . 1 ( 2 ) ( 2024 ) 91 - 102 As showcased by F ig . 9 (c.f., [19] ), Rényi State Entropy (RISE) outperformed other methods in terms of average return across six Atari games, with RISE achieving the highest performance consistently. Additionally, RISE demonstrated better training efficiency in terms of Frames Per Second (FPS) compared to other methods like RE3 and MaxRényi, showcasing its advantage in policy performance and learning efficiency.</p>
<p>Fig. 9. Average episodes return versus the number of environment steps on Atari games .</p>
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<sec><title>4 Conclusion, Open Problems, and Future Research Pathways</title><p>Using distinct sets of circumstances to optimi z e the Rényi entropy function, we revealed fresh results in this study. The outcomes produce generali z ed t - distributions for the whole family of Lévy stable distributions. It is discovered that the Lévy distribution generalizes the Tsallisian case, not the other way around. The work of [22] , where Shannon and Havrda - Charvat entropy functional were utili z ed, is strongly generali z ed in this work.</p>
<p>The current paper flags several sophisticated open problems: I. Is it possible to replace the undertaken mathematical mechanism by Ismail &apos; s Entropy (IE) (c.f., [23] ). If so, what will be the generated distributions ? II. It is expected that using IE would result in higher accuracies in feature selection in comparison to both Shannonian and Rényian cases. The mechanism could be quite sophisticated, but it is doable and would be highly promising as a new frontier to enhance machine learning.</p>
<p>Future research pathways include delving into unlocking the proposed open problems, as well as the exploration of novel information - theoretic applications to interdisciplinary fields of human knowledge.</p>
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<sec><title>Funding</title><p>No specific funding was received for this research.</p>
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