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Improved techniques for estimating signal probabilities

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2 Author(s)
Krishnamurthy, B. ; Tektronix Labs., Beaverton, OR, USA ; Tollis, I.G.

The problem is presented in the context of some recent theoretical advances on a related problem, called random satisfiability. These recent results indicate the theoretical limitations inherent in the problem of computing signal probabilities. Such limitations exist even if one uses Monte Carlo techniques for estimating signal probabilities. Theoretical results indicate that any practical method devised to compute signal probabilities would have to be evaluated purely on an empirical basis. An improved algorithm is offered for estimating the signal probabilities that takes into account the first-order effects of reconvergent input leads. It is demonstrated that this algorithm is linear in the product of the size of the network and the number of inputs. Empirical evidence is given indicating the improved performance obtained using this method over the straightforward probability computations. The results are very good, and the algorithm is very fast and easy to implement

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Computers, IEEE Transactions on  (Volume:38 ,  Issue: 7 )