I am trying to run ELKI for Outlier Detection using ABOD method. I see the various visualizations as result, but not the outlier scores or rankings. What should I do to say get top 10 outliers using ELKI?
1
votes
I ran the algorithm using MiniGui. For changing the Result format/ getting outlier ranking, I do not know which parameter etc to change! Is there a good page on the tutorial for the MiniGui - understanding and using various parameters?
– user3065574
Don't use it, but have you seen this? dragonwake.com/download/minigui-1.6.10/docs/… Looks long enough to at least stand a chance of providing the answer.
– Aleksander Lidtke
@AleksanderLidtke that link has nothing to do with ELKI minigui.
– Has QUIT--Anony-Mousse
@user3065574 Look at the output file. It should be sorted, outliers first. Note that with ABOD, low scores are outliers.
– Has QUIT--Anony-Mousse
Hey! Thanks for your suggestions - tried loading the results to a file/score-dumper - It gives this error - Could not evaluate outlier results, as I could not find a minority label - Any help?
– user3065574
2 Answers
1
votes
The ELKI ResultWriter will write the outliers to a file in decreasing outlierness (if the method is implemented with the appropriate metadata to allow correct sorting).
As for ABOD, please not that the implementation you are using (ELKI 0.6.0~beta2 and before) is actually FastABOD, unless you set abod.k to the data set size. The 0.6.0 release will have separate classes for ABOD, FastABOD and LB-ABOD. But since ABOD scales O(n^3) it will be only usable for small data sets!
