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
