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From Ryan Rosario <uclamath...@gmail.com>
Subject Re: Heap Space Issues with Complementary Naive Bayes
Date Sat, 05 May 2012 01:36:22 GMT
Setting those options makes no difference. TFIDF calculation
immediately stops with an OutOfMemory error. It doesn't even try.
The system only uses about 1-4GB. The only way to get anything to run
is to use something like <= 100 documents, which does not help me.

MAHOUT_OPTS=-Xmx24g
JAVA_HEAP_MAX=-Xmx24000m

R.


On Fri, May 4, 2012 at 6:13 PM, Lance Norskog <goksron@gmail.com> wrote:
> It's MAHOUT_OPTS. Read bin/mahout. There's also a JAVA_HEAP_MAX that
> uses Heapsize.
>
> Try running the script with "sh -x bin/mahout". This will show you the
> actual command line. Or 'ps -ef | cat'.
>
> On Fri, May 4, 2012 at 4:49 PM, Ryan Rosario <uclamathguy@gmail.com> wrote:
>> Hi,
>>
>> I am trying to follow along with the 20 newsgroups example but using
>> my own data. I am running the examples on a server with 24GB of RAM
>> and 24 cores. When I get to the "Computing TF-IDF" stage, the whole
>> process fails with the following exception. I have 14000 documents and
>> 2 classes. The lexicon consists of 2705284 trigrams which I created
>> myself. I then set the ng parameter equal to 1 since I already
>> tokenized the words myself.
>>
>> The system at max has only been using 4-5GB total, and I have set
>> MAHOUT_OPTIONS=-Xmx4g, MAHOUT_HEAPSIZE=24000,
>> mapred.map.child.java.opts=-Xmx24g just to see if I could get Mahout
>> to acknowledge the increase in heap space, but this does not seem to
>> be helping at all.
>>
>> What else can I try to get past this problem? The system has plenty of RAM.
>>
>> Thanks,
>> Ryan
>>
>> ./bin/mahout trainclassifier -i /user/ryan/pageclass-train -o
>> pageclass-out -type cbayes -ng 1 -source
>>
>> ....
>> 12/05/04 15:52:43 INFO cbayes.CBayesDriver: Calculating Tf-Idf...
>> 12/05/04 15:52:46 INFO common.BayesTfIdfDriver: Counts of documents in
>> Each Label
>> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
>>        at java.lang.StringCoding$StringEncoder.encode(StringCoding.java:232)
>>        at java.lang.StringCoding.encode(StringCoding.java:272)
>>        at java.lang.String.getBytes(String.java:946)
>>        at org.apache.hadoop.io.DefaultStringifier.fromString(DefaultStringifier.java:73)
>>        at org.apache.mahout.classifier.bayes.mapreduce.common.BayesTfIdfDriver.runJob(BayesTfIdfDriver.java:88)
>>        at org.apache.mahout.classifier.bayes.mapreduce.cbayes.CBayesDriver.runJob(CBayesDriver.java:51)
>>        at org.apache.mahout.classifier.bayes.TrainClassifier.trainCNaiveBayes(TrainClassifier.java:58)
>>        at org.apache.mahout.classifier.bayes.TrainClassifier.main(TrainClassifier.java:151)
>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>        at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
>>        at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
>>        at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188)
>>        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)
>>
>>
>> --
>> RRR
>>
>>
>> --
>> RRR
>
>
>
> --
> Lance Norskog
> goksron@gmail.com



-- 
RRR

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