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D Malzahn

Publications and source records attributed to D Malzahn.

2 recordsLinked to original sources

Learning strategies for the maximally stable diluted binary perceptron

I show analytically that an optimally chosen continuous precursor J in the hypercube is highly correlated to the maximally stable diluted binary perceptron which solves the same storage problem. J allows the construction of a diluted binary perceptron D by a simple rule. Performing simulations for perceptrons of size N=100 I demonstrate that D is highly stable and can be improved in an efficient manner by partial enumeration thereby incorporating information from the precursor components. The precursor highlights the vector components on which partial enumeration improves the stability of the vector most efficiently. Moreover, it discriminates for each vector component i at least one of the three possible values D(i)=-1,0,1 as being extremely unlikely.

Journal Article↗

Correlations between hidden units in multilayer neural networks and replica symmetry breaking.

We consider feed-forward neural networks with one hidden layer, tree architecture, and a fixed hidden-to-output Boolean function. Focusing on the saturation limit of the storage problem the influence of replica symmetry breaking on the distribution of local fields at the hidden units is investigated. These field distributions determine the probability of finding a specific activation pattern of the hidden units as well as the corresponding correlation coefficients and therefore quantify the division of labor among the hidden units. We find that although modifying the storage capacity and the distribution of local fields markedly replica symmetry breaking has only a minor effect on the correlation coefficients. Detailed numerical results are provided for the PARITY, COMMITTEE, and AND machines with K=3 hidden units and nonoverlapping receptive fields.

Journal Article↗