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      Returns an anonymous list of individuals/chromosomes of the current
      population.

      IMPORTANT: the actual array reference used by the AI::Genetic::Pro
      object is returned, so any changes to it will be reflected in $ga.

    $ga->chromosomes()

      Alias for people.

    $ga->chart(%options)

      Generate a chart describing changes of min, mean, and max scores in
      your population. To satisfy your needs, you can pass the following
      options:

      -filename

	File to save a chart in (obligatory).

      -title

	Title of a chart (default: Evolution).

      -x_label

	X label (default: Generations).

      -y_label

	Y label (default: Value).

      -format

	Format of values, like sprintf (default: '%.2f').

      -legend1

	Description of min line (default: Min value).

      -legend2

	Description of min line (default: Mean value).

      -legend3

	Description of min line (default: Max value).

      -width

	Width of a chart (default: 640).

      -height

	Height of a chart (default: 480).

      -font

	Path to font (in *.ttf format) to be used (default: none).

      -logo

	Path to logo (png/jpg image) to embed in a chart (default: none).

      For example:

                $ga->chart(-width => 480, height => 320, -filename => 'chart.png');

    $ga->save($file)

      Save the current state of the genetic algorithm to the specified
      file.

    $ga->load($file)

      Load a state of the genetic algorithm from the specified file.

    $ga->as_array($chromosome)

      In list context return an array representing the specified
      chromosome. In scalar context return an reference to an array
      representing the specified chromosome. If variable_length is turned
      on and is set to level 2, an array can have some undef values. To get
      only not undef values use as_array_def_only instead of as_array.

    $ga->as_array_def_only($chromosome)

      In list context return an array representing the specified
      chromosome. In scalar context return an reference to an array
      representing the specified chromosome. If variable_length is turned
      off, this function is just an alias for as_array. If variable_length
      is turned on and is set to level 2, this function will return only
      not undef values from chromosome. See example below:

          # -variable_length => 2, -type => 'bitvector'
              
          my @chromosome = $ga->as_array($chromosome)
          # @chromosome looks something like that
          # ( undef, undef, undef, 1, 0, 1, 1, 1, 0 )
              
          @chromosome = $ga->as_array_def_only($chromosome)
          # @chromosome looks something like that
          # ( 1, 0, 1, 1, 1, 0 )

    $ga->as_string($chromosome)

      Return a string representation of the specified chromosome. See
      example below:

              # -type => 'bitvector'
              
              my $string = $ga->as_string($chromosome);
              # $string looks something like that
              # 1___0___1___1___1___0 
              
              # or 
              
              # -type => 'listvector'
              
              $string = $ga->as_string($chromosome);
              # $string looks something like that
              # element0___element1___element2___element3...