Oh, I thought kmeans gave me a point vector as a centroid, not a calculated point central to a cluster. I guess in this case I would be looking for the most central point vector (from the index ) that I can use as a representative of the cluster.
On Tue, Jul 21, 2015 at 6:41 AM, Andrew Musselman < [email protected]> wrote: > I'm not sure centroid id is even a defined thing, especially since the > centroid, in my understanding, is just a point in space, not necessarily a > point in your data. > > Are you trying to find the most-central point in a given cluster? > > On Mon, Jul 20, 2015 at 5:18 PM, Ankit Goel <[email protected]> > wrote: > > > Hi, > > I've been messing with mahout 0.10 and kmeans clustering with a solr > 4.6.1 > > index. The data is news articles. The --field option for kmeans is set to > > "content". The idField is set to "title" (just so i can analyse it > faster). > > The clusterdump of the kmeans result gives me a proper output, but I cant > > figure out the id of the vector chosen as the center. There are only > 14-15 > > articles so I am not hung up about the cluster performance at this time. > > > > I used random seeds for the kmeans commandline. > > For reference, this is the commandline cluster dump I am executing > > > > bin/mahout clusterdump -i $MAHOUT_HOME/testCluster/clusters-3-final > > -p $MAHOUT_HOME/testCluster/clusteredPoints -d $MAHOUT_HOME/dict.txt -b 5 > > > > The output I get is off the form > > > > :{"r": > > > > top terms > > > > xxxxx==>xxxxx > > > > Weight : [props - optional]: Point: > > > > 1.0 : [distance=0.0]: [{"account":0.026}.......other features] > > > > 1.0 : [distance=0.3963903651622338]: [....] > > > > > > So how exactly do I get the centroid id? I have even tried accessing it > > with java > > > > ClusterWritable value.getValue().getCenter() but this just gives me the > > features and values of the centroid. > > > > Also, please do explain the meaning of "account":0.026 (just making sure > I > > know it right). I used tfidf. > > > > -- > > Regards, > > Ankit Goel > > http://about.me/ankitgoel > > > -- Regards, Ankit Goel http://about.me/ankitgoel
