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https://issues.apache.org/jira/browse/MAHOUT-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409453#comment-13409453
]
jayghost commented on MAHOUT-1034:
----------------------------------
Thanks, Sean Owen, I find there is a WARN driver.MahoutDriver: No trainnb.props
found on classpath, will use command-line arguments only. Does it mean the
org.apache.mahout.classifier.naivebayes.training.WeightsMapper.numLabels should
be set in the trainnb.props?
And I see the source file of
org.apache.mahout.classifier.naivebayes.training.WeightsMapper:
{
public class WeightsMapper extends Mapper<IntWritable, VectorWritable, Text,
VectorWritable>
{
static final String NUM_LABELS = WeightsMapper.class.getName() + ".numLabels";
private Vector weightsPerFeature;
private Vector weightsPerLabel;
protected void setup(Mapper<IntWritable, VectorWritable, Text,
VectorWritable>.Context ctx)
throws IOException, InterruptedException
{
super.setup(ctx);
int numLabels = Integer.parseInt(ctx.getConfiguration().get(NUM_LABELS));
Preconditions.checkArgument(numLabels > 0);
this.weightsPerLabel = new RandomAccessSparseVector(numLabels);
}
......
}
The error is throwed at "Preconditions.checkArgument(numLabels > 0)".
But how to set the numLabels? I think I must miss something.
> ERROR in Navie Bayes Training(trainnb)
> --------------------------------------
>
> Key: MAHOUT-1034
> URL: https://issues.apache.org/jira/browse/MAHOUT-1034
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 0.7
> Environment: Ubuntu 11.04
> Reporter: Leting Wu
> Priority: Critical
>
> When run either examples/classify-20newsgrouops.sh or ash-email-examples.sh,
> trainnb always fails:
> {noformat}
> INFO mapred.JobClient: Task Id : attempt_201206281546_0003_m_000000_0, Status
> : FAILED
> java.lang.IllegalArgumentException
> at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:72)
> at
> org.apache.mahout.classifier.naivebayes.training.WeightsMapper.setup(WeightsMapper.java:42)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:647)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:323)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1177)
> at org.apache.hadoop.mapred.Child.main(Child.java:264)
> {noformat}
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