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From Vasil Vasilev <vavasi...@gmail.com>
Subject Re: Problems using ldatopics
Date Wed, 11 May 2011 14:27:02 GMT
Hi Florie,

You should provide as an input to ldatopics the result of the last state
produced by lda, rather then the tf-vectors.
You can take a look at the script that clusters the Reuters data set
(located at examples/bin/build-reuters.sh in the Mahout source trunk)

Regards, Vasil

On Tue, May 10, 2011 at 10:23 PM, florie <ion.florie@gmail.com> wrote:

> Hi, after using lda, I am having problems with reading the output topics
> using ldatopics:
>
> The error is as follows:
>
> [ion@lovemachine Downloads]$ mahout-0.4/bin/mahout ldatopics --input
> sparsePosTokens/tf-vectors --dict sparsePosTokens/dictionary.file-0 --words
> 30 --output sparsePosTokens/topics --dictionaryType sequencefile
> Running on hadoop, using HADOOP_HOME=hadoop
> No HADOOP_CONF_DIR set, using hadoop/conf
> Exception in thread "main" java.io.IOException: wrong value class: 0.0 is
> not class org.apache.mahout.math.VectorWritable
>    at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1874)
>    at
>
> org.apache.mahout.clustering.lda.LDAPrintTopics.topWordsForTopics(LDAPrintTopics.java:208)
>    at
>
> org.apache.mahout.clustering.lda.LDAPrintTopics.main(LDAPrintTopics.java:156)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at
>
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
>    at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
>    at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:184)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> [ion@lovemachine Downloads]$ mahout-0.4/bin/mahout ldatopics --input
> vectorSeqTokens/tf-vectors --dict vectorSeqTokens/dictionary.file-0 --words
> 30 --output sparsePosTokens/topics --dictionaryType sequencefile
> Running on hadoop, using HADOOP_HOME=hadoop
> No HADOOP_CONF_DIR set, using hadoop/conf
> Exception in thread "main" java.io.IOException: wrong value class: 0.0 is
> not class org.apache.mahout.math.VectorWritable
>    at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1874)
>    at
>
> org.apache.mahout.clustering.lda.LDAPrintTopics.topWordsForTopics(LDAPrintTopics.java:208)
>    at
>
> org.apache.mahout.clustering.lda.LDAPrintTopics.main(LDAPrintTopics.java:156)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at
>
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
>    at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
>    at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:184)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
>
>
> I can't seem to figure what the problem is. Any help is appreciated. Thank
> you!
> --
> Ion Florie Ho
> iho1@binghamton.edu
> Dept. of Systems Science and Industrial Engineering
> Binghamton University
> 4400 Vestal Parkway
> Binghamton, NY 13902
> Phone: (516) 587-0807
>

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