[jboss-jira] [JBoss JIRA] (JBRULES-3471) Planner 5.4.0CR1: Local Search Phase: Log shows move but best/final solution does not

[Geoffrey De Smet (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12686329#comment-12686329 ] 

Geoffrey De Smet commented on JBRULES-3471:
-------------------------------------------

Important note: The last solution is not necessarily the best solution.
Planner reminders the best solution it encounters, but when it hits a local optima, it will need to do a few steps that have worse solution to get out of it and find a better local optima.

The log clearly says ",     best score", not ", new best score", so that's normal that that step move isn't in the best solution (unless later a new best solution is found and no other step move has undone that step move).
                
> Planner 5.4.0CR1: Local Search Phase: Log shows move but best/final solution does not
> -------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3471
>                 URL: https://issues.jboss.org/browse/JBRULES-3471
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-planner
>    Affects Versions: 5.3.0.Final, 5.4.0.CR1
>         Environment: Windows XP SP3
> java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
> Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing)
>            Reporter: Vikram Duggal
>            Assignee: Geoffrey De Smet
>
> While comparing the log file output of the Local Search phase (Tabu) with the final/best solution, there are several instances where log file shows move occurred but the final/best solution obtained after time/user termination shows the planning entity still on previous planning variable.
> I saw this issue using 5.3.0 Final and also in 5.4.0CR1.
> I saw this issue in my code and also in the "Hospital Bed Planning" examples bundled in the distribution.
> Example (Log output from the Hospital Bed Planning testdata01.xml) -
> ...
> 2012-04-20 11:53:35,066 [pool-289-thread-1] DEBUG     Step index (27), time spend (22873), score (0hard/-9292soft),     best score (0hard/-9292soft), accepted move size (500) for picked step ([Patient655(11-11) @ Department4_490_1 => Department1_119_0]).
> ...
> Checking the final solution, I see that Patient655 is still on Department4_490_1

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