Factor graphs and the sum-product algorithm

@article{Kschischang2001FactorGA,
  title={Factor graphs and the sum-product algorithm},
  author={Frank R. Kschischang and Brendan J. Frey and Hans-Andrea Loeliger},
  journal={IEEE Trans. Information Theory},
  year={2001},
  volume={47},
  pages={498-519}
}
Algorithms that must deal with complicated global functions of many variables often exploit the manner in which the given functions factor as a product of “local” functions, each of which depends on a subset of the variables. Such a factorization can be visualized with a bipartite graph that we call afactor graph. In this tutorial paper, we present a generic message-passing algorithm, the sum-product algorithm, that operates in a factor graph. Following a single, simple computational rule, the… CONTINUE READING
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