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From Markus Paaso <markus.pa...@sagire.fi>
Subject Re: ClassCastException in mahout cvb (0.7)
Date Mon, 13 Aug 2012 06:08:18 GMT
Created a new JIRA issue https://issues.apache.org/jira/browse/MAHOUT-1055

-Markus

2012/8/13 Markus Paaso <markus.paaso@sagire.fi>

> 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)
>>
>


-- 
Markus Paaso
Developer, Sagire Software Oy
http://sagire.fi/

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