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From "Karthik Prakhya (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-1330) Unable to do K-means clustering on Reuters dataset
Date Thu, 12 Sep 2013 15:48:53 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-1330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Prakhya updated MAHOUT-1330:
------------------------------------

    Attachment:     (was: hadoop-core-1.1.2.jar)
    
> Unable to do K-means clustering on Reuters dataset
> --------------------------------------------------
>
>                 Key: MAHOUT-1330
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1330
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.8
>         Environment: Linux
>            Reporter: Karthik Prakhya
>             Fix For: 0.8
>
>         Attachments: df-count.txt, frequency-file.txt, MyAnalyzer.java, NewsKMeansClustering.java,
NewsKMeansClustering-output.txt, reuters-seqfiles.zipx, test-kmeans-clustering-reuters-java-api.sh,
tfidf-vectors.txt
>
>
> The attached code uses the Mahout API to do k-means clustering on the Reuters dataset
and generates the initial centroids using the canopy algorithm. The parameters are exactly
the same as the ones in the Scala example presented in the following link:
> http://sujitpal.blogspot.com/2012/09/learning-mahout-clustering.html
> The code compiles without an error, but the K-means algorithm cannot initiate because
the initial centroids are not being generated. This in turn is due to the fact that the TF-IDF
vectors are not being generated.
> Considering that this code compiles and is based on earlier Scala code that worked, it
is suggestive that there is a bug in the Mahout source code that may need fixing. I thought
I should bring it to your attention.
> I have attached the source code, the included JAR files and the shell script (called
test-kmeans-clustering-reuters-java-api.sh) to compile and run the code. The output of the
shell script is located in NewsKMeansClustering-output.txt. Please note that you may need
to change the path (see environmental variable JARPATH) to the JAR files in the shell script
based on where you put the JARs. I also attached the output of clusterdump utility in the
form of .txt files for the intermediate outputs of my code such as the TF vectors and TF-IDF
vectors (see tf-vectors.txt, tfidf-vectors.txt, df-count.txt and frequency-file.txt).

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