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From Julián Limón Núñez <julian.li...@tukipa.com>
Subject Error running bin/mahout rowid
Date Sat, 16 Apr 2011 02:54:43 GMT
Hello all,

I hope you guys can shed some light here. I've been trying to use the
command line to convert a seq2sparse-generated vector into a matrix form
that is a SequenceFile<IntWritable,VectorWritable> and a
SequenceFile<IntWritable,Text> as suggested in
https://cwiki.apache.org/MAHOUT/dimensional-reduction.html and
http://search.lucidimagination.com/search/document/748181681ae5238b/need_a_little_help_with_using_svd#994da1aa86154c12

However, I'm getting the following error:

bin/mahout rowid --input
/home/julian/Documents/code/bb/test6/vectors/tfidf-vectors/part-r-00000
--output /home/julian/Documents/code/bb/test6/matrix/
no HADOOP_HOME set, running locally
Exception in thread "main" java.lang.IllegalArgumentException: Can not
create a Path from a null string
at org.apache.hadoop.fs.Path.checkPathArg(Path.java:78)
at org.apache.hadoop.fs.Path.<init>(Path.java:90)
at org.apache.mahout.utils.vectors.RowIdJob.run(RowIdJob.java:41)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.mahout.utils.vectors.RowIdJob.main(RowIdJob.java:79)
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)

I've already tried to change "input" and "output" for "mapred.input.dir" and
"mapred.output.dir" to no avail. Any hints on what may be causing the error?
Alternatively, a pointer to the classes I could use to achieve the same
result would also help.

Thanks a lot,

Julian

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