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From Markus Paaso <markus.pa...@sagire.fi>
Subject Re: ClassCastException in mahout cvb (0.7)
Date Mon, 13 Aug 2012 05:23:50 GMT
Why is IntWritable used as id field in Mahout CVB?
(org.apache.mahout.clustering.lda.cvb.CachingCVB0Mapper)
Does Long have that significant impact on performance?

Long is much more usable as id type and int causes compatibility issues
like the one below.


Cheers, Markus



2012/8/10 Markus Paaso <markus.paaso@sagire.fi>

> Hi
>
> I am using mahout 0.7 with hadoop 0.20.205 and getting ClassCastException
> when running mahout cvb command for lucene vectors.
> It seems like LongWritable is tried to cast to IntWritable.
>
> Is there something I am missing?
>
>
> Regards, Markus
>
>
>
> /opt/mahout/bin/mahout lucene.vector --dir
> /home/markus/workspace/lucene-index --output
> ../mahout-files/vectors/content --field content --dictOut
> ../mahout-files/dictionaries/content --norm 2 --idField personId
> --maxDFPercent 20 --minDF 2 -w TFIDF
>
> /opt/mahout/bin/mahout cvb -D mapred.child.java.opts=-Xmx2048M --input
> ../mahout-files/vectors/content --output ../mahout-files/lda-workdir
> --num_terms 30957 --overwrite --num_topics 20 --doc_topic_output
> ../mahout-files/lda-training --maxIter 10 --tempDir ../mahout-files/lda-temp
>
>
> MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
> Running on hadoop, using /usr/bin/hadoop and HADOOP_CONF_DIR=/etc/hadoop
> MAHOUT-JOB: /opt/mahout/mahout-examples-0.7-job.jar
> Picked up JAVA_TOOL_OPTIONS: -XX:+UseBiasedLocking
> Picked up JAVA_TOOL_OPTIONS: -XX:+UseBiasedLocking
> 12/08/10 08:18:02 INFO common.AbstractJob: Command line arguments:
> {--convergenceDelta=[0], --doc_topic_output=[../mahout-files/lda-training],
> --doc_t
> opic_smoothing=[0.0001], --endPhase=[2147483647],
> --input=[../mahout-files/vectors/content], --iteration_block_size=[10],
> --maxIter=[10], --max_doc_to
> pic_iters=[10], --num_reduce_tasks=[10], --num_terms=[30957],
> --num_topics=[20], --num_train_threads=[4], --num_update_threads=[1],
> --output=[../mahou
> t-files/lda-workdir], --overwrite=null, --startPhase=[0],
> --tempDir=[../mahout-files/lda-temp], --term_topic_smoothing=[0.0001],
> --test_set_fraction=[
> 0]}
> 12/08/10 08:18:02 INFO cvb.CVB0Driver: Will run Collapsed Variational
> Bayes (0th-derivative approximation) learning for LDA on
> ../mahout-files/vectors
> /content (numTerms: 30957), finding 20-topics, with document/topic prior
> 1.0E-4, topic/term prior 1.0E-4.  Maximum iterations to run will be 10,
> unles
> s the change in perplexity is less than 0.0.  Topic model output
> (p(term|topic) for each topic) will be stored ../mahout-files/lda-workdir.
> Random in
> itialization seed is 2871, holding out 0.0 of the data for perplexity check
>
> 12/08/10 08:18:02 INFO cvb.CVB0Driver: p(topic|docId) will be stored
> ../mahout-files/lda-training
>
> 12/08/10 08:18:02 INFO cvb.CVB0Driver: Current iteration number: 0
> 12/08/10 08:18:02 INFO cvb.CVB0Driver: About to run iteration 1 of 10
> 12/08/10 08:18:02 INFO cvb.CVB0Driver: About to run: Iteration 1 of 10,
> input path: ../mahout-files/lda-temp/topicModelState/model-0
> 12/08/10 08:18:02 INFO util.NativeCodeLoader: Loaded the native-hadoop
> library
> 12/08/10 08:18:02 INFO input.FileInputFormat: Total input paths to process
> : 1
> 12/08/10 08:18:03 INFO mapred.JobClient: Running job: job_local_0001
> 12/08/10 08:18:03 INFO util.ProcessTree: setsid exited with exit code 0
> 12/08/10 08:18:03 INFO mapred.Task:  Using ResourceCalculatorPlugin :
> org.apache.hadoop.util.LinuxResourceCalculatorPlugin@1a1399
> 12/08/10 08:18:03 INFO mapred.MapTask: io.sort.mb = 10
> 12/08/10 08:18:03 INFO mapred.MapTask: data buffer = 7969177/9961472
> 12/08/10 08:18:03 INFO mapred.MapTask: record buffer = 26214/32768
> 12/08/10 08:18:03 INFO zlib.ZlibFactory: Successfully loaded & initialized
> native-zlib library
> 12/08/10 08:18:03 INFO compress.CodecPool: Got brand-new decompressor
> 12/08/10 08:18:03 INFO cvb.CachingCVB0Mapper: Retrieving configuration
> 12/08/10 08:18:03 INFO cvb.CachingCVB0Mapper: Initializing read model
> 12/08/10 08:18:03 INFO cvb.CachingCVB0Mapper: No model files found
> 12/08/10 08:18:03 INFO cvb.CachingCVB0Mapper: Initializing write model
> 12/08/10 08:18:03 INFO cvb.CachingCVB0Mapper: Initializing model trainer
> 12/08/10 08:18:03 INFO cvb.ModelTrainer: Starting training threadpool with
> 4 threads
> 12/08/10 08:18:03 WARN mapred.LocalJobRunner: job_local_0001
> java.lang.ClassCastException: org.apache.hadoop.io.LongWritable cannot be
> cast to org.apache.hadoop.io.IntWritable
>     at
> org.apache.mahout.clustering.lda.cvb.CachingCVB0Mapper.map(CachingCVB0Mapper.java:55)
>     at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>     at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
>     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>     at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
> 12/08/10 08:18:04 INFO mapred.JobClient:  map 0% reduce 0%
> 12/08/10 08:18:04 INFO mapred.JobClient: Job complete: job_local_0001
> 12/08/10 08:18:04 INFO mapred.JobClient: Counters: 0
> Exception in thread "main" java.lang.InterruptedException: Failed to
> complete iteration 1 stage 1
>     at
> org.apache.mahout.clustering.lda.cvb.CVB0Driver.runIteration(CVB0Driver.java:518)
>     at
> org.apache.mahout.clustering.lda.cvb.CVB0Driver.run(CVB0Driver.java:304)
>     at
> org.apache.mahout.clustering.lda.cvb.CVB0Driver.run(CVB0Driver.java:187)
>     at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>     at
> org.apache.mahout.clustering.lda.cvb.CVB0Driver.main(CVB0Driver.java:550)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
>     at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
>     at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:195)
>     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)
>

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