bugGNU Octave - Bugs: bug #49411, [octave forge] (fuzzy-logic) fcm...

 
 

bug #49411: [octave forge] (fuzzy-logic) fcm problem with clustering big data sets

Submitter:  Tony Trew <tonytrew>
Submitted:  Sat 22 Oct 2016 07:15:50 AM UTC
   
 
Category:  Octave Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Segfault, Bus Error, etc.
Status:  Invalid / Not an Octave Bug Assigned to:  None
Originator Name:  Tony Trew Open/Closed:  * Closed
Release:  * 4.0.2 Operating System:  * Microsoft Windows
Fixed Release:  None Planned Release:  None
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Sat 22 Oct 2016 05:42:32 PM UTC, comment #1: 

Apologies - the problem was a bad data point with Total Votes = 0 and therefore division by zero for feature scores

Tony Trew <tonytrew>
Sat 22 Oct 2016 07:15:50 AM UTC, original submission:  

Using fcm in the fuzzy-logic-toolkit-0.4.5 runs into problems with bigger sets of data points. This is the function call:
 

[cluster_centers, soft_partition, obj_fcn_history]=fcm(Xpc,k,[2,100,1e-4]);


Xpc (size 22613 X 14) is a set of election results in percentages with each point summing to 1.00

The script terminates at the first iteration with the message:

Iteration count = 1,  Objective fcn = NaN


If the number of points is reduced to 2700  it completes and returns [cluster_centers, soft_partition, obj_fcn_history], as well as values for:
partition_coeff (soft_partition));
partition_entropy (soft_partition, 2));
xie_beni_index (Xpc1, cluster_centers, soft_partition));

But any more points than 2700 and the same problem occurs, even if the number of clusters is reduced to 2 and the dimension of the data points decreased.

I am running this on an HP laptop, with 8.00 Gb RAM, 64-bit operating system , x64 based processor








Tony Trew <tonytrew>

 

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  • -email is unavailable- added by jwe (Updated the item)
  • -email is unavailable- added by tonytrew (Submitted the item)
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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-02-26 mtmiller StatusNone Invalid / Not an Octave Bug
        Open/ClosedOpen Closed
    2017-08-13 jwe Summaryfcm problem with clustering big data sets [octave forge] (fuzzy-logic) fcm problem with clustering big data sets
    2016-10-22 tonytrew Carbon-Copy- Added tonytrew

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