Omni-Channel Product Distribution Network Design by Using the Improved Particle Swarm Optimization Algorithm

Box 1

The improved PSO.

Initialization

Set the parameters ;

Initialize 9 independent particle swarms:

which are in the 11-dimensional solution space ;

Define position () and velocity () for each particle;

Assume individual best () equal to the initialized particles;

Select the best particle as global best ();

Update

Let 9 particle swarms be updated independently as follows:

For t = 1 to MaxItr

Update position () and velocity ();

If  

Else if  

Respectively;

End

Evaluate the particles and calculate the fitness values;

Sort the fitness values;

If  

End

Update personal best () of 9 independent particle swarms;

Update global best () of 9 independent particle swarms;

End

Report

Global best () of 9 independent particle swarms;

found by splicing 9 independent particle swarms;

Fitness values calculated by .