Phase Transitions in Machine Learning by Lorenza Saitta, Attilio Giordana, Antoine Cornuéjols

By Lorenza Saitta, Attilio Giordana, Antoine Cornuéjols

Section transitions usually ensue in combinatorial computational difficulties and feature vital effects, specially with the present unfold of statistical relational studying in addition to series studying methodologies. In part Transitions in computer studying the authors commence by way of describing intimately this phenomenon, and the vast experimental research that helps its presence. They then flip their awareness to the potential implications and discover acceptable equipment for tackling them. Weaving jointly basic elements of computing device technological know-how, statistical physics and laptop studying, the ebook presents adequate arithmetic and physics historical past to make the topic intelligible to researchers in AI and different machine technological know-how groups. Open study matters also are mentioned, suggesting promising instructions for destiny learn.

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26) As f is an analytic function, it cannot exhibit a phase transition for any finite value of T , except T = 0. 2. We assume that each spin interacts only with its four nearest neighbors (top, bottom, left, right), and that there is no external magnetic field. Again, the strength of the interaction is constant and equal to J. Then the energy of the spin located at a point (i, j) will Energy of be E(i, j) = −Jσi,j (σi−1,j + σi+1,j + σi,j−1 + σi,j+1 ). 27) the 2D Ising model To obtain the total energy E we have to sum over all sites of the N × N grid: E = −J E(i, j) = −J i=j N σi,j (σi−1,j + σi+1,j + σi,j−1 + σi,j+1 ) i=j N −1 N N σi,j σi−1,j − J = −J i=2 j=1,j=i N i=1 j=1,j=i N −J σi,j σi+1,j N N −1 σi,j σi,j−1 − J i=1 j=2,j=i σi,j σi,j+1 .

In the main we have followed the approach of Landau and Lifshitz, to which the interested reader is referred, if he or she wants to go deeper into the subject (Landau and Lifshitz, 1976, 1980). In dynamics (Landau and Lifshitz, 1976), a central role is played by the notion of a point particle, which is a body with a finite mass m whose size can be Point particle neglected when describing its motion, so that it can be geometrically assimilated to a point. The position of a point particle is given by a vector r in the Cartesian 12 Basic notions of statistical physics 13 coordinate space (x, y, z), and its velocity is the time derivative of r: v= dr .

This type of phase transition is a continuous one. 4 The first classification of phase transitions in matter was proposed by Paul Ehrenfest in 1933 (see for instance Jaeger, 1998), following the discovery, the year before, of the λ-transition in liquid helium by W. H. Keesom and coworkers (Keesom and van den Ende, 1932). Ehrenfest classified phase transitions in terms of the thermodynamic quantities that present a discontinuity. The order of the transition is the same as the order of the derivative of the free energy that shows a discontinuity.

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