genetic algorithm - Fitness Sharing in multi objective optimization -

-

i'm writing genetic algorithm uses fitness sharing in tournament selection. in relevant literature found (sareni example) mentioned solution's own fitness (fi) should divided sum of niche distances (mi).

what don't understand is, optimizing multiple objectives each solution has more 1 fitness. 'fitness' fi? should see multiplication of fitness's ?

for example, in code i'm writing (processing): 

float sharedfitnessa = (a.f2*a.f3) / nichecounta;

thanks

n

for multi objective optimization goal of fitness sharing (to distribute population on number of different peaks in search space each peak receiving fraction of population in proportion height of peak) pursued in different manner.

when 2 candidates either both dominated or both non-dominated (so it's they're in same equivalence class) niche count mi used choose "best fit" candidate.

e.g.

equivalence class sharing

(here maximizing along x-axis , minimizing on y-axis)

candidates aren't dominated comparison set. pareto point of view neither preferred. using mi choose candidate2 (smallest niche count , least number of individuals in niche).

this called equivalence class sharing , isn't based on fitness degradation (i.e. fi / mi), anyway maintains diversity along front.

for further details take @ multiobjective optimization using niched pareto genetic algorithm jeffrey horn , nicholas nafpliotis (it contains implementation details).


Comments

Post a Comment

Popular posts from this blog

java - nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet Hibernate+SpringMVC -

-
i trying fetch records database , having above error this classs appropriate getters , setters public class user { private int id; private string username; private string password; private string email; i have create database , inserted data below configuration <bean id="datasource" class="org.apache.commons.dbcp2.basicdatasource" destroy-method="close"> <property name="driverclassname" value="com.mysql.jdbc.driver"/> <property name="url" value="jdbc:mysql://localhost:3306/usersdb"/> <property name="username" value="root"/> <property name="password" value=""/> </bean> this complete stacktrace severe: servlet.service() servlet [appservlet] in context path [/spring] threw exception [request processing failed; nested exception org.hibernate.exception.sqlgrammarexception: not ...
Read more

sql - Postgresql tables exists, but getting "relation does not exist" when querying -

-
Image
i have postgresql db number of tables. if query: select column_name information_schema.columns table_name="my_table"; i list of columns returned properly. however, when query: select * "my_table"; i error: (programmingerror) relation "my_table" not exist 'select *\n "my_table"\n' {} any thoughts on why can columns, can't query table? goal able query table. you have include schema if isnt public one select * <schema>."my_table" or can change default schema show search_path; set search_path my_schema; check table schema here select * information_schema.columns for example if table on default schema public both works ok select * parroquias_region select * public.parroquias_region but sectors need specify schema select * map_update.sectores_point
Read more

asp.net mvc - breakpoint on javascript in CSHTML? -

-
i have .cshtml file has javascript tag. within script tag have few lines of javascript. first line of javascript refers property in @viewbag. other javascript lines plain script without mvc related references. observation: can place breakpoints (visual studio 2015) on each of these javascript lines. however, breakpoints has white dot in center of breakpoint symbol (red circle) except line @viewbag reference (this particular line not have white dot in center). it seems breakpoint without white dot hit during run-time. question: can explain going on here? white dot mean? why plain red breakpoint line line hitting breakpoint? the visual studio debugger expecting debug actual server-side code within .cshtml file opposed client-side javascript within it. iirc, visual studio allow debug javascript code expected in internet explorer (and possibly edge), other browsers want use either third-party tool or developer tools (f12) within browser. an easy approach take advant...
Read more