Re: How to use kmeans clustering algorithm of Mahout

Wed, 12 Sep 2012 20:00:18 -0700

I have tried it by following the way of the sample code, and I noticed that I should not use seq2sparse directory. That leads to the sparse result is empty.... Anyone you known could help me deal with that? 

On 09/12/2012 07:09 PM, Paritosh Ranjan wrote:
I think it shouldn't be sparse in the beginning, the seq2sparse should take care of it. Some one will correct me if I would be wrong, so, wait for some time and then go ahead. 

On 12-09-2012 16:07, Don.Tan wrote:

Thank you for you promptly reply. Can I ask a question before I go on?

     My original data is in a format like that:
176329,116300,175216,167307,**46710,138740,100681,2089,1842,**
1206,101702,99210,50460,89605,**177424,142901,176464,160625,**
38201,112101,4048,1716,167599,**140883,158250,175399,


which is in a sparse format. Is that correct to use seqdirectory and 
seq2sparse directly?



On 09/12/2012 06:30 PM, Paritosh Ranjan wrote:

Also try to follow the steps in cluster-reuters.sh file. This might 
help.


On 12-09-2012 15:59, Paritosh Ranjan wrote:

Can you explain something about the error and provide the stacktrace ?

On 12-09-2012 14:22, Don.Tan wrote:

The original data is here:

[hadoop@datamining ~]$ hadoop fs -ls /home/test/test
Found 1 items

-rw-r--r--   1 hadoop supergroup  129213799 2012-09-12 15:45 
/home/test/test/result



After I used "mahout seqdirectory -i /home/test/test/ -o 
/home/test/result/ -c UTF-8", get this:


[hadoop@datamining ~]$ hadoop fs -ls /home/test/result
Found 1 items

-rw-r--r--   1 hadoop supergroup  129213898 2012-09-12 15:47 
/home/test/result/chunk-0



And after "mahout seq2sparse -i /home/test/result -o 
/home/test/sparse":


[hadoop@datamining ~]$ hadoop fs -ls /home/test/sparse
Found 7 items

drwxr-xr-x   - hadoop supergroup          0 2012-09-12 15:54 
/home/test/sparse/df-count
-rw-r--r--   1 hadoop supergroup     442252 2012-09-12 15:53 
/home/test/sparse/dictionary.file-0
-rw-r--r--   1 hadoop supergroup     394853 2012-09-12 15:54 
/home/test/sparse/frequency.file-0
drwxr-xr-x   - hadoop supergroup          0 2012-09-12 15:53 
/home/test/sparse/tf-vectors
drwxr-xr-x   - hadoop supergroup          0 2012-09-12 15:54 
/home/test/sparse/tfidf-vectors
drwxr-xr-x   - hadoop supergroup          0 2012-09-12 15:53 
/home/test/sparse/tokenized-documents
drwxr-xr-x   - hadoop supergroup          0 2012-09-12 15:53 
/home/test/sparse/wordcount



Which should I do next? I used "mahout kmeans -i 
/home/test/sparse/ -o /home/test/kmeans -dm 
org.apache.mahout.common.distance.CosineDistanceMeasure -x 10 -k 
20 -ow --clustering"

but I got error.....

Thx!


On 09/12/2012 03:24 PM, Paritosh Ranjan wrote:

I think you will need these two commands ( in the same order ) :

seqdirectory : Generate sequence files (of Text) from a directory
seq2sparse: Sparse Vector generation from Text sequence files

On 12-09-2012 12:28, Don Tan wrote:

I think I didn't explain clear enough and sorry for that.

The example showed before is a part of my data.


Each line is a user profile, for example, the first row is the 
features of

a user. And I want to apply k-means to this data.


I need to create a file saves all users profile as sparse vector 
and put

them in mahout k-means algorithm, how can I do that?

  Thanks for your advice!

Don Tan

2012/9/12 Paritosh Ranjan <[email protected]>


I could not understand the question correctly, can you explain 
more?

Here you can find how to use kmeans algorithm of Mahout

https://cwiki.apache.org/**confluence/display/MAHOUT/K-**Means+Clustering<https://cwiki.apache.org/confluence/display/MAHOUT/K-Means+Clustering> 


.


On 12-09-2012 11:43, Don.Tan wrote:


Aloha!


    I am new to hadoop and mahout, but I have set up the 
hadoop cluster.



    I am working on a clustering task lately. I think I could 
not make it
quickly because I don't know too much about how to deal with 
massive data (
my data contains 1400000 user and 50000 features..plus that is 
sparse ).



    Could you tell me how deal with that? A slice of data is 
here:


167555,152622,162252,79481,**66540,41942,75500,167898,**

61923,182083,180681,181135,**174449,166439,167307,174126,**87800,2826, 


     98660,158620,33900,
4780,13922,45040,159210,26423,**1471,68200,70402,109721,**
145860,23740,5818,15087,47861,**158620,170482,170161,39120,**

164514,5854,169183,151229,**171110,163457,4356,21363,1307,**78105,1322,177011,167822, 



176329,116300,175216,167307,**46710,138740,100681,2089,1842,**
1206,101702,99210,50460,89605,**177424,142901,176464,160625,**
38201,112101,4048,1716,167599,**140883,158250,175399,


     example above contains 4 user's data and each number is 
nominal

(denoting that is a kind of behavior of user, e.s, user 2 has
"98660","158620","33900" )


     Please tell me how to work on that or which documents 
should I read..



     Thx!

    Don Tan












































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