@TechReport{Werner-TR-2010-05,
  IS = { zkontrolovano 31 Jan 2011 },
  UPDATE  = { 2010-10-19 },
  author =       {Werner, Tom{\'a}{\v s}},
  title =        {Belief Propagation Fixed Points as Zero Gradients of a
                  Function of Reparameterizations},
  institution =  {Center for Machine Perception, K13133 FEE Czech Technical
                  University},
  address =      {Prague, Czech Republic},
  year =         {2010},
  month =        {February},
  type =         {Research Report},
  number =       {CTU--CMP--2010--05},
  issn =         {1213-2365},
  pages =        {15},
  figures =      {0},
  authorship =   {100},
  psurl =        {[Werner-TR-2010-05.pdf]},
  project  =     {ICT-215078 DIPLECS},
  annote = {The existing view on loopy belief propagation sees it as
    an algorithm to find a common zero of a system of non-linear
    functions, not explicitly related to each other. We show that
    these functions are in fact related -- they are the partial
    derivatives of a single function of reparameterizations. Thus,
    belief propagation searches for a zero gradient of this
    function. We show that BP fixed points are in one-to-one
    correspondence to zero gradients of this function and that every
    zero gradient point of this function is a saddle point. },
  keywords =     {belief propagation, graphical models, Markov random fields,
                  variational inference},
}