Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-10-10
Physics
Condensed Matter
Disordered Systems and Neural Networks
PhD thesis defended the 16th September 2010 at the Laboratoire de Physique Th\'eorique of \'Ecole Normale Sup\'erieure in Pari
Scientific paper
Several recent experiments in biology study systems composed of several interacting elements, for example neuron networks. Normally, measurements describe only the collective behavior of the system, even if in most cases we would like to characterize how its different parts interact. The goal of this thesis is to extract information about the microscopic interactions as a function of their collective behavior for two different cases. First, we will study a system described by a generalized Ising model. We find explicit formulas for the couplings as a function of the correlations and magnetizations. In the following, we will study a system described by a Hopfield model. In this case, we find not only explicit formula for inferring the patterns, but also an analytical result that allows one to estimate how much data is necessary for a good inference.
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