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Capacity of two-layer feedforward neural networks with binary weights

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2 Author(s)
Chuanyi Ji ; Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA ; Psaltis, D.

The lower and upper bounds for the information capacity of two-layer feedforward neural networks with binary interconnections, integer thresholds for the hidden units, and zero threshold for the output unit is obtained through two steps. First, through a constructive approach based on statistical analysis, it is shown that a specifically constructed (N-2L-1) network with N input units, 2L hidden units, and one output unit is capable of implementing, with almost probability one, any dichotomy of O(W/ln W) random samples drawn from some continuous distributions, where W is the total number of weights of the network. This quantity is then used as a lower bound for the information capacity C of all (N-2L-1) networks with binary weights. Second, an upper bound is obtained and shown to be O(W) by a simple counting argument. Therefore, we have Ω(W/ln W)⩽C⩽O(W)

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Information Theory, IEEE Transactions on  (Volume:44 ,  Issue: 1 )