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Mohammed Nechba

Publications and source records attributed to Mohammed Nechba.

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Computing the Vapnik Chervonenkis Dimension for Non-Discrete Settings

In 1984, Valiant [ 7 ] introduced the Probably Approximately Correct (PAC) learning framework for boolean function classes. Blumer et al. [ 2] extended this model in 1989 by introducing the VC dimension as a tool to characterize the learnability of PAC. The VC dimension was based on the work of Vapnik and Chervonenkis in 1971 [8 ], who introduced a tool called the growth function to characterize the shattering property. Researchers have since determined the VC dimension for specific classes, and efforts have been made to develop an algorithm that can calculate the VC dimension for any concept class. In 1991, Linial, Mansour, and Rivest [4] presented an algorithm for computing the VC dimension in the discrete setting, assuming that both the concept class and domain set were finite. However, no attempts had been made to design an algorithm that could compute the VC dimension in the general setting.Therefore, our work focuses on developing a method to approximately compute the VC dimension without constraints on the concept classes or their domain set. Our approach is based on our finding that the Empirical Risk Minimization (ERM) learning paradigm can be used as a new tool to characterize the shattering property of a concept class.

cs.DS

An Introduction to the Hausdorff Measure and Its Applications in Fractal Geometry

This paper presents a comprehensive introduction to the Hausdorff measure, a fundamental tool in fractal geometry and geometric measure theory. We begin by defining the Hausdorff outer measure on subsets of metric spaces, followed by a discussion of Caratheodory's criterion, which characterizes measurable sets. From this foundation, we construct the Hausdorff measure and explore its essential properties, including monotonicity and translation invariance. We then introduce the Hausdorff dimension, a powerful generalization of Euclidean dimension, particularly suited to analyzing non-regular or self-similar sets. As an application, we examine the Cantor ternary set, computing its Hausdorff dimension and demonstrating how the Hausdorff measure captures its geometric complexity. This exposition aims to bridge the gap between abstract theory and illustrative application, offering insights relevant to mathematics and various scientific domains such as physics and computer science.

math.GT