NS2 Genetic Algorithm

How to Implement Genetic Algorithm Projects using NS2 code

What is Genetic Algorithm? Implementing Genetic Algorithm using NS2 Simulator

Genetic algorithms contains global search methods such as selection, crossover and mutation.In networks genetic algorithm is used for topology optimization for effective results.we will see what are requirements for implementing genetic algorithm using ns2 and download sample source code using NS3 Genetic Algorithm.

Architecture-of-Genetic-Algorithm

Requirements of genetic algorithm:

  • It requires two things mainly are generic representation of the solution domain and fitness function.
  • Standard representation of the solution is as an array of bits.
  • Variable length representation may also be used but crossover implementation is more complex in this case.
  • Main property that makes these genetic representations convenient is that their parts are easily aligned due to their fixed size, that facilitates simple crossover operation.
  • Tree-like representation are explored in genetic programming.

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Sample code for NS2 genetic algorithm:

This is the sample code for calculating mutation and cross over operation.



proc combineGenes { mother father } {
     variable crossover
     set all_bits_set -2147483647
     set child {}
     foreach first $mother second $father {
        set bit_no  [expr int(32.0*rand())]
        set bitmask [expr {($all_bits_set>>$bit_no)<<$bit_no}]
        set newgene [expr {$first&$bitmask|$second&~$bitmask}]
        lappend child $newgene
     }

     return $child
  }
  proc mutateGenes { child } {
     variable mutation
     set newgenes {}
     foreach gene $child {
        if { [expr {rand()}] < $mutation } {
           set bit_no  [expr {int(32.0*rand())}]
           set bitmask [expr {1<<$bit_no}]
           set bitset  [expr {($gene&$bitmask) != 0}]
           if { $bitset } {
              set newgene [expr {$gene&~$bitmask}]
           } else {
              set newgene [expr {$gene|$bitmask}]
           }
        } else {
           set newgene $gene
        }
        lappend newgenes $newgene     }
     return $newgenes
  }  } ;# End of namespace

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