Stack Overflow
Stack Overflow

Questions tagged [elki]

ELKI is an open source data mining software with the focus on cluster analysis and outlier detection. It uses index structures for accelerating these algorithms.

ELKI is an open source data mining software with the focus on cluster analysis and outlier detection. In contrast to most other tools, it has support for index structures.

164 questions
7
votes
1 answer

ELKI OPTICSXi - how set xi?

I'm trying to use ELKI to cluster a dataset of geolocations using OPTICS. I've understood that to extract the clusters, I need to use the OPTICSXi algorithm rather than OPTICS which computes just the clusters order. I was wondering if you could give…
Deborah
  • 355
  • 1
  • 5
  • 15
7
votes
2 answers

ELKI implementation of OPTICS clustering algorithm detects only one cluster

I'm having issue with using OPTICS implementation in ELKI environment. I have used the same data for DBSCAN implementation and it worked like a charm. Probably I'm missing something with parameters but I can't figure it out, everything seems to be…
Ilya Khaustov
  • 328
  • 1
  • 6
  • 21
5
votes
1 answer

ELKI: Running DBSCAN on custom Objects in Java

I'm trying to use ELKI from within JAVA to run DBSCAN. For testing I used a FileBasedDatabaseConnection. Now I would like to run DBSCAN with my custom Objects as parameters. My objects have the following structure: public class MyObject { private…
RBo
  • 53
  • 2
5
votes
1 answer

interpreting the results of OPTICSxi Clustering

I am interested in detecting clusters in areas with varying-density, such as user-generated data in cities, and for that I adopted the OPTICS algorithm. Unlike DBSCAN, the OPTICS algorithm does not produce a strict cluster partition, but an…
doublebyte
  • 1,225
  • 3
  • 13
  • 22
5
votes
2 answers

Different results from LOF implementation in ELKI and RapidMiner

I have written my own implementation of LOF and I'm trying to compare results with the implementations in ELKI and RapidMiner, but all 3 give different results! I'm trying to work out why. My reference dataset is one-dimensional, 102 real values…
Michael D.
  • 195
  • 1
  • 9
4
votes
1 answer

How big of a Dataset can ELKI handle?

I have 100,000 points that I would like to cluster using the OPTICS algorithm in ELKI. I have a upper triangular distance matrix of about 5 billion entries for this point set. In the format that ELKI wants the matrix, it will take about 100GB in…
jason
  • 3,471
  • 6
  • 30
  • 43
4
votes
2 answers

Running clustering algorithms in ELKI

I need to run a k-medoids clustering algorithm by using ELKI programmatically. I have a similarity matrix that I wish to input to the algorithm. Is there any code snippet available for how to run ELKI algorithms? I basically need to know how to…
Alphaaa
  • 4,206
  • 8
  • 34
  • 43
3
votes
2 answers

Error opening registry key ‘Software\JavaSoft\JRE’ while installing elki

I am trying to download ELKI. So as per the readme file I run the elki.bat( I am using windows 10 ). But I get the following java related errors : Error: opening registry key ‘Software\JavaSoft\JRE’ Error: could not find java.dll Error: Could not…
Sascha
  • 35
  • 1
  • 1
  • 7
3
votes
2 answers

Predicting a numeric attribute through high dimensional nominal attributes

I'm having difficulties mining a big (100K entries) dataset of mine concerning logistics transportation. I have around 10 nominal String attributes (i.e. city/region/country names, customers/vessel identification codes, etc.). Along with those, I…
hildebro
  • 549
  • 2
  • 5
  • 20
3
votes
1 answer

ELKI dbscan examples

I want to use dbscan algorithm in ELKI (not on GUI). Please give me some examples including loading data, running algorithm, displaying results? The docs of ELKI don't have any examples.
user7840830
  • 61
  • 1
  • 2
3
votes
1 answer

What's the recommended way of building ELKI's current development status?

I forked ELKI from https://github.com/elki-project because I want to keep up to date with the latest development status while making my own changes and additions to the source (which I will possibly provide via pull request if it's sensible). I…
Johannes Ebster
  • 65
  • 7
3
votes
1 answer

ELKI, output: ROCAUC, Precision@k, f1.maximum

What is Precision @ k used for in the outlier case? (when varying k on the same dataset I always get: Precision @ 3016 and I don't get where ELKI has that number from, number of outliers are 1508) and precision.average and precision.r? and…
limoan
  • 105
  • 8
3
votes
1 answer

Adding PH-Tree to ELKI

I'm considering adding the PH-tree to ELKI. I couldn't find any tutorials for examples for that, and the internal architecture is not fully obvious to me at the moment. Do you think it makes sense to add the PH-tree to ELKI? How much effort would…
TilmannZ
  • 1,784
  • 11
  • 18
3
votes
1 answer

Obtaining cluster boundaries of ELKI OPTICSXi

I have a one-dimensional data set for which the histogram plot shows multiple local maxima, so I know that there are multiple regions in my one-dimensional space where the data is more dense. I want to determing boundaries for these dense regions…
Niek Tax
  • 841
  • 1
  • 11
  • 30
3
votes
1 answer

ELKI: Implementing a custom ResultHandler

I need to implement a custom ResultHandler but I am confused about how to actually integrate my custom class into the software package. I have read this: http://elki.dbs.ifi.lmu.de/wiki/HowTo/InvokingELKIFromJava but my question is how are you meant…
niwaywood
  • 33
  • 4
1
2 3
…
10 11