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1. ÒýÑÔ
Á£×ÓȺÓÅ»¯Ëã·¨(PSO)ÊÇÒ»ÖÖ½ø»¯¼ÆËã¼¼Êõ(evolutionary computation)£¬ÓÐEberhart²©Ê¿ºÍkennedy²©Ê¿·¢Ã÷¡£Ô´ÓÚ¶ÔÄñȺ²¶Ê³µÄÐÐΪÑо¿

PSOͬÒÅ´«Ëã·¨ÀàËÆ£¬ÊÇÒ»ÖÖ»ùÓÚµþ´úµÄÓÅ»¯¹¤¾ß¡£ÏµÍ³³õʼ»¯ÎªÒ»×éËæ»ú½â£¬Í¨¹ýµþ´úËÑѰ×îÓÅÖµ¡£µ«ÊDz¢Ã»ÓÐÒÅ´«Ëã·¨ÓõĽ»²æ(crossover)ÒÔ¼°±äÒì(mutation)¡£¶øÊÇÁ£×ÓÔÚ½â¿Õ¼ä×·Ëæ×îÓŵÄÁ£×Ó½øÐÐËÑË÷¡£ÏêϸµÄ²½ÖèÒÔºóµÄÕ½ڽéÉÜ

ͬÒÅ´«Ëã·¨±È½Ï£¬PSOµÄÓÅÊÆÔÚÓÚ¼òµ¥ÈÝÒ×ʵÏÖ²¢ÇÒûÓÐÐí¶à²ÎÊýÐèÒªµ÷Õû¡£Ä¿Ç°Òѹ㷺ӦÓÃÓÚº¯ÊýÓÅ»¯£¬Éñ¾­ÍøÂçѵÁ·£¬Ä£ºýϵͳ¿ØÖÆÒÔ¼°ÆäËûÒÅ´«Ëã·¨µÄÓ¦ÓÃÁìÓò


2. ±³¾°: È˹¤ÉúÃü

"È˹¤ÉúÃü"ÊÇÀ´Ñо¿¾ßÓÐijЩÉúÃü»ù±¾ÌØÕ÷µÄÈ˹¤ÏµÍ³. È˹¤ÉúÃü°üÀ¨Á½·½ÃæµÄÄÚÈÝ

1. Ñо¿ÈçºÎÀûÓüÆËã¼¼ÊõÑо¿ÉúÎïÏÖÏó
2. Ñо¿ÈçºÎÀûÓÃÉúÎï¼¼ÊõÑо¿¼ÆËãÎÊÌâ

ÎÒÃÇÏÖÔÚ¹Ø×¢µÄÊǵڶþ²¿·ÖµÄÄÚÈÝ. ÏÖÔÚÒѾ­ÓкܶàÔ´ÓÚÉúÎïÏÖÏóµÄ¼ÆËã¼¼ÇÉ. ÀýÈç, È˹¤Éñ¾­ÍøÂçÊǼò»¯µÄ´óÄÔÄ£ÐÍ. ÒÅ´«Ëã·¨ÊÇÄ£Äâ»ùÒò½ø»¯¹ý³ÌµÄ.

ÏÖÔÚÎÒÃÇÌÖÂÛÁíÒ»ÖÖÉúÎïϵͳ- Éç»áϵͳ. ¸üÈ·ÇеÄÊÇ, ÔÚÓɼòµ¥¸öÌå×é³ÉµÄȺÂäÓë»·¾³ÒÔ¼°¸öÌåÖ®¼äµÄ»¥¶¯ÐÐΪ. Ò²¿É³Æ×ö"ȺÖÇÄÜ"(swarm intelligence). ÕâЩģÄâϵͳÀûÓþֲ¿ÐÅÏ¢´Ó¶ø¿ÉÄܲúÉú²»¿ÉÔ¤²âµÄȺÌåÐÐΪ

ÀýÈçfloys ºÍ boids, ËûÃǶ¼ÓÃÀ´Ä£ÄâÓãȺºÍÄñȺµÄÔ˶¯¹æÂÉ, Ö÷ÒªÓÃÓÚ¼ÆËã»úÊÓ¾õºÍ¼ÆËã»ú¸¨ÖúÉè¼Æ.

ÔÚ¼ÆËãÖÇÄÜ(computational intelligence)ÁìÓòÓÐÁ½ÖÖ»ùÓÚȺÖÇÄܵÄËã·¨. ÒÏȺËã·¨(ant colony optimization)ºÍÁ£×ÓȺËã·¨(particle swarm optimization). ǰÕßÊǶÔÂìÒÏȺÂäʳÎï²É¼¯¹ý³ÌµÄÄ£Äâ. ÒѾ­³É¹¦ÔËÓÃÔںܶàÀëÉ¢ÓÅ»¯ÎÊÌâÉÏ.

Á£×ÓȺÓÅ»¯Ëã·¨(PSO) Ò²ÊÇÆðÔ´¶Ô¼òµ¥Éç»áϵͳµÄÄ£Äâ. ×î³õÉèÏëÊÇÄ£ÄâÄñȺÃÙʳµÄ¹ý³Ì. µ«ºóÀ´·¢ÏÖPSOÊÇÒ»ÖֺܺõÄÓÅ»¯¹¤¾ß.

3. Ëã·¨½éÉÜ

ÈçǰËùÊö£¬PSOÄ£ÄâÄñȺµÄ²¶Ê³ÐÐΪ¡£ÉèÏëÕâÑùÒ»¸ö³¡¾°£ºÒ»ÈºÄñÔÚËæ»úËÑË÷ʳÎï¡£ÔÚÕâ¸öÇøÓòÀïÖ»ÓÐÒ»¿éʳÎï¡£ËùÓеÄÄñ¶¼²»ÖªµÀʳÎïÔÚÄÇÀï¡£µ«ÊÇËûÃÇÖªµÀµ±Ç°µÄλÖÃÀëʳÎﻹÓжàÔ¶¡£ÄÇôÕÒµ½Ê³ÎïµÄ×îÓŲßÂÔÊÇÊ²Ã´ÄØ¡£×î¼òµ¥ÓÐЧµÄ¾ÍÊÇËÑѰĿǰÀëʳÎï×î½üµÄÄñµÄÖÜÎ§ÇøÓò¡£

PSO´ÓÕâÖÖÄ£ÐÍÖеõ½Æôʾ²¢ÓÃÓÚ½â¾öÓÅ»¯ÎÊÌâ¡£PSOÖУ¬Ã¿¸öÓÅ»¯ÎÊÌâµÄ½â¶¼ÊÇËÑË÷¿Õ¼äÖеÄÒ»Ö»Äñ¡£ÎÒÃdzÆÖ®Îª¡°Á£×Ó¡±¡£ËùÓеÄÀý×Ó¶¼ÓÐÒ»¸öÓɱ»ÓÅ»¯µÄº¯Êý¾ö¶¨µÄÊÊÓ¦Öµ(fitness value)£¬Ã¿¸öÁ£×Ó»¹ÓÐÒ»¸öËٶȾö¶¨ËûÃÇ·ÉÏèµÄ·½ÏòºÍ¾àÀ롣ȻºóÁ£×ÓÃǾÍ×·Ëæµ±Ç°µÄ×îÓÅÁ£×ÓÔÚ½â¿Õ¼äÖÐËÑË÷

PSO ³õʼ»¯ÎªÒ»ÈºËæ»úÁ£×Ó(Ëæ»ú½â)¡£È»ºóͨ¹ýµþ´úÕÒµ½×îÓŽ⡣ÔÚÿһ´Îµþ´úÖУ¬Á£×Óͨ¹ý¸ú×ÙÁ½¸ö"¼«Öµ"À´¸üÐÂ×Ô¼º¡£µÚÒ»¸ö¾ÍÊÇÁ£×Ó±¾ÉíËùÕÒµ½µÄ×îÓŽ⡣Õâ¸ö½â½Ð×ö¸öÌ弫ֵpBest. ÁíÒ»¸ö¼«ÖµÊÇÕû¸öÖÖȺĿǰÕÒµ½µÄ×îÓŽ⡣Õâ¸ö¼«ÖµÊÇÈ«¾Ö¼«ÖµgBest¡£ÁíÍâÒ²¿ÉÒÔ²»ÓÃÕû¸öÖÖȺ¶øÖ»ÊÇÓÃÆäÖÐÒ»²¿·Ö×îΪÁ£×ÓµÄÁÚ¾Ó£¬ÄÇôÔÚËùÓÐÁÚ¾ÓÖеļ«Öµ¾ÍÊǾֲ¿¼«Öµ¡£

ÔÚÕÒµ½ÕâÁ½¸ö×îÓÅֵʱ, Á£×Ó¸ù¾ÝÈçÏµĹ«Ê½À´¸üÐÂ×Ô¼ºµÄËٶȺÍеÄλÖÃ

v[] = v[] + c1 * rand() * (pbest[] - present[]) + c2 * rand() * (gbest[] - present[]) (a)
present[] = persent[] + v[] (b)

v[] ÊÇÁ£×ÓµÄËÙ¶È, persent[] Êǵ±Ç°Á£×ÓµÄλÖÃ. pbest[] and gbest[] Èçǰ¶¨Òå rand () ÊǽéÓÚ£¨0£¬ 1£©Ö®¼äµÄËæ»úÊý. c1, c2 ÊÇѧϰÒò×Ó. ͨ³£ c1 = c2 = 2.

³ÌÐòµÄα´úÂëÈçÏÂ

For each particle
____Initialize particle
END

Do
____For each particle
________Calculate fitness value
________If the fitness value is better than the best fitness value (pBest) in history
____________set current value as the new pBest
____End

____Choose the particle with the best fitness value of all the particles as the gBest
____For each particle
________Calculate particle velocity according equation (a)
________Update particle position according equation (b)
____End
While maximum iterations or minimum error criteria is not attained

ÔÚÿһάÁ£×ÓµÄËٶȶ¼»á±»ÏÞÖÆÔÚÒ»¸ö×î´óËÙ¶ÈVmax£¬Èç¹ûijһά¸üкóµÄËٶȳ¬¹ýÓû§É趨µÄVmax£¬ÄÇôÕâһάµÄËٶȾͱ»ÏÞ¶¨ÎªVmax

4. ÒÅ´«Ëã·¨ºÍ PSO µÄ±È½Ï

´ó¶àÊýÑÝ»¯¼ÆËã¼¼Êõ¶¼ÊÇÓÃͬÑùµÄ¹ý³Ì
1. ÖÖÈºËæ»ú³õʼ»¯
2. ¶ÔÖÖȺÄÚµÄÿһ¸ö¸öÌ弯ËãÊÊÓ¦Öµ(fitness value).ÊÊÓ¦ÖµÓë×îÓŽâµÄ¾àÀëÖ±½ÓÓйØ
3. ÖÖȺ¸ù¾ÝÊÊÓ¦Öµ½øÐи´ÖÆ
4. Èç¹ûÖÕÖ¹Ìõ¼þÂú×ãµÄ»°£¬¾ÍÍ£Ö¹£¬·ñÔòת²½Öè2

´ÓÒÔÉϲ½Ö裬ÎÒÃÇ¿ÉÒÔ¿´µ½PSOºÍGAÓкܶ๲֮ͬ´¦¡£Á½Õß¶¼Ëæ»ú³õʼ»¯ÖÖȺ£¬¶øÇÒ¶¼Ê¹ÓÃÊÊÓ¦ÖµÀ´ÆÀ¼Ûϵͳ£¬¶øÇÒ¶¼¸ù¾ÝÊÊÓ¦ÖµÀ´½øÐÐÒ»¶¨µÄËæ»úËÑË÷¡£Á½¸öϵͳ¶¼²»ÊDZ£Ö¤Ò»¶¨ÕÒµ½×îÓŽâ

µ«ÊÇ£¬PSO ûÓÐÒÅ´«²Ù×÷Èç½»²æ(crossover)ºÍ±äÒì(mutation). ¶øÊǸù¾Ý×Ô¼ºµÄËÙ¶ÈÀ´¾ö¶¨ËÑË÷¡£Á£×Ó»¹ÓÐÒ»¸öÖØÒªµÄÌØµã£¬¾ÍÊÇÓмÇÒä¡£

ÓëÒÅ´«Ëã·¨±È½Ï, PSO µÄÐÅÏ¢¹²Ïí»úÖÆÊǺܲ»Í¬µÄ. ÔÚÒÅ´«Ëã·¨ÖУ¬È¾É«Ìå(chromosomes) »¥Ï๲ÏíÐÅÏ¢£¬ËùÒÔÕû¸öÖÖȺµÄÒÆ¶¯ÊDZȽϾùÔȵÄÏò×îÓÅÇøÓòÒÆ¶¯. ÔÚPSOÖÐ, Ö»ÓÐgBest (or lBest) ¸ø³öÐÅÏ¢¸øÆäËûµÄÁ£×Ó£¬ ÕâÊǵ¥ÏòµÄÐÅÏ¢Á÷¶¯. Õû¸öËÑË÷¸üйý³ÌÊǸúËæµ±Ç°×îÓŽâµÄ¹ý³Ì. ÓëÒÅ´«Ëã·¨±È½Ï, ÔÚ´ó¶àÊýµÄÇé¿öÏ£¬ËùÓеÄÁ£×Ó¿ÉÄܸü¿ìµÄÊÕÁ²ÓÚ×îÓŽâ

5. È˹¤Éñ¾­ÍøÂç ºÍ PSO

È˹¤Éñ¾­ÍøÂç(ANN)ÊÇÄ£Äâ´óÄÔ·ÖÎö¹ý³ÌµÄ¼òµ¥ÊýѧģÐÍ£¬·´Ïòת²¥Ëã·¨ÊÇ×îÁ÷ÐеÄÉñ¾­ÍøÂçѵÁ·Ëã·¨¡£½øÀ´Ò²ÓкܶàÑо¿¿ªÊ¼ÀûÓÃÑÝ»¯¼ÆËã(evolutionary computation)¼¼ÊõÀ´Ñо¿È˹¤Éñ¾­ÍøÂçµÄ¸÷¸ö·½Ãæ¡£

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6. PSOµÄ²ÎÊýÉèÖÃ

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PSOÖв¢Ã»ÓÐÐí¶àÐèÒªµ÷½ÚµÄ²ÎÊý,ÏÂÃæÁгöÁËÕâЩ²ÎÊýÒÔ¼°¾­ÑéÉèÖÃ

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Á£×ӵķ¶Î§: ÓÉÓÅ»¯ÎÊÌâ¾ö¶¨,ÿһά¿ÉÊÇÉ趨²»Í¬µÄ·¶Î§

Vmax: ×î´óËÙ¶È,¾ö¶¨Á£×ÓÔÚÒ»¸öÑ­»·ÖÐ×î´óµÄÒÆ¶¯¾àÀë,ͨ³£É趨ΪÁ£×ӵķ¶Î§¿í¶È,ÀýÈçÉÏÃæµÄÀý×ÓÀï,Á£×Ó (x1, x2, x3) x1 ÊôÓÚ [-10, 10], ÄÇô Vmax µÄ´óС¾ÍÊÇ 20

ѧϰÒò×Ó: c1 ºÍ c2 ͨ³£µÈÓÚ 2. ²»¹ýÔÚÎÄÏ×ÖÐÒ²ÓÐÆäËûµÄȡֵ. µ«ÊÇÒ»°ã c1 µÈÓÚ c2 ²¢ÇÒ·¶Î§ÔÚ0ºÍ4Ö®¼ä

ÖÐÖ¹Ìõ¼þ: ×î´óÑ­»·ÊýÒÔ¼°×îС´íÎóÒªÇó. ÀýÈç, ÔÚÉÏÃæµÄÉñ¾­ÍøÂçѵÁ·Àý×ÓÖÐ, ×îС´íÎó¿ÉÒÔÉ趨Ϊ1¸ö´íÎó·ÖÀà, ×î´óÑ­»·É趨Ϊ2000, Õâ¸öÖÐÖ¹Ìõ¼þÓɾßÌåµÄÎÊÌâÈ·¶¨.

È«¾ÖPSOºÍ¾Ö²¿PSO: ÎÒÃǽéÉÜÁËÁ½ÖÖ°æ±¾µÄÁ£×ÓȺÓÅ»¯Ëã·¨: È«¾Ö°æºÍ¾Ö²¿°æ. ǰÕßËٶȿ첻¹ýÓÐʱ»áÏÝÈë¾Ö²¿×îÓÅ. ºóÕßÊÕÁ²ËÙ¶ÈÂýÒ»µã²»¹ýºÜÄÑÏÝÈë¾Ö²¿×îÓÅ. ÔÚʵ¼ÊÓ¦ÓÃÖÐ, ¿ÉÒÔÏÈÓÃÈ«¾ÖPSOÕÒµ½´óÖµĽá¹û,ÔÙÓоֲ¿PSO½øÐÐËÑË÷.

ÁíÍâµÄÒ»¸ö²ÎÊýÊǹßÐÔÈ¨ÖØ, ÓÉShi ºÍEberhartÌá³ö, ÓÐÐËȤµÄ¿ÉÒԲο¼ËûÃÇ1998ÄêµÄÂÛÎÄ(ÌâÄ¿: A modified particle swarm optimizer)


7. Online Resources of PSO
The development of PSO is still ongoing. And there are still many unknown areas in PSO research such as the mathematical validation of particle swarm theory.

One can find much information from the internet. Following are some information you can get online:

http://www.particleswarm.net lots of information about Particle Swarms and, particularly, Particle Swarm Optimization. lots of Particle Swarm Links.

http://icdweb.cc.purdue.edu/~hux/PSO.shtml lists an updated bibliography of particle swarm optimization and some online paper links

http://www.researchindex.com/ you can search particle swarm related papers and references.

References:

http://www.engr.iupui.edu/~eberhart/
http://users.erols.com/cathyk/jimk.html
http://www.alife.org
http://www.aridolan.com
http://www.red3d.com/cwr/boids/
http://iridia.ulb.ac.be/~mdorigo/ACO/ACO.html
http://www.engr.iupui.edu/~shi/Coference/psopap4.html
Kennedy, J. and Eberhart, R. C. Particle swarm optimization. Proc. IEEE int'l conf. on neural networks Vol. IV, pp. 1942-1948. IEEE service center, Piscataway, NJ, 1995.
Eberhart, R. C. and Kennedy, J. A new optimizer using particle swarm theory. Proceedings of the sixth international symposium on micro machine and human science pp. 39-43. IEEE service center, Piscataway, NJ, Nagoya, Japan, 1995.
Eberhart, R. C. and Shi, Y. Particle swarm optimization: developments, applications and resources. Proc. congress on evolutionary computation 2001 IEEE service center, Piscataway, NJ., Seoul, Korea., 2001.
Eberhart, R. C. and Shi, Y. Evolving artificial neural networks. Proc. 1998 Int'l Conf. on neural networks and brain pp. PL5-PL13. Beijing, P. R. China, 1998.
Eberhart, R. C. and Shi, Y. Comparison between genetic algorithms and particle swarm optimization. Evolutionary programming vii: proc. 7th ann. conf. on evolutionary conf., Springer-Verlag, Berlin, San Diego, CA., 1998.
Shi, Y. and Eberhart, R. C. Parameter selection in particle swarm optimization. Evolutionary Programming VII: Proc. EP 98 pp. 591-600. Springer-Verlag, New York, 1998.
Shi, Y. and Eberhart, R. C. A modified particle swarm optimizer. Proceedings of the IEEE International Conference on Evolutionary Computation pp. 69-73. IEEE Press, Piscataway, NJ, 1998
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