[MAHOUT-1635] Getting an exception when I provide classification labels manually for Naive Bayes

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9
• Fix Version/s: 0.10.0
• Labels: legacy
• Assignee: Andrew Palumbo
• Reporter: Suman Somasundar
• Created: 18/Dec/14 22:55
• Updated: 31/Jan/24 22:12
• Resolved: 04/Apr/15 23:01

Description

If I let the Naive Bayes program itself extract the classification labels, the program runs fine. But, I get the following error when I provide the classification labels for the dataset manually.

Error: java.lang.IllegalArgumentException: Wrong numLabels: 0. Must be > 0!
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
at org.apache.mahout.classifier.naivebayes.training.WeightsMapper.setup(WeightsMapper.java:45)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:784)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:169)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1640)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)