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  Sets the user defined fitness function to call.  The fitness function 
  should return a value between 0 and 1.  Users may want to look into 
  the sigmoid function [1 / (1+e^(-x))] and it's variants to implement 
  this.  Also, you may want to take a look at either t/PSO.t for the 
  simple test or examples/NeuralNetwork/pso_ann.pl for an example on 
  how to train a simple 3-layer feed forward neural network.  (Note 
  that a real training application would have a real dataset with many 
  input-output pairs...pso_ann.pl is a _very_ simple example.  Also note 
  that the neural network exmaple requires g++.  Type 'make run' in the 
  examples/NeuralNetwork directory to run the example.  Lastly, the 
  neural network c++ code is in a very different coding style.  I did 
  indeed write this, but it was many years ago when I was striving to 
  make my code nicely formatted and good looking :)).

=item pso_optimize()

  Runs the particle swarm optimization algorithm.  This consists of 
  running iterations of search and many calls to the fitness function 
  you registered with pso_register_fitness_function()

=item pso_get_solution_array()