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https://issues.apache.org/jira/browse/OPENNLP-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joern Kottmann closed OPENNLP-1017.
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    Resolution: Cannot Reproduce

The issue - in case you train with enough data - is probably that you only have 
one document. Come to the mailing list and tell us about your data.

The name finder format says that you can use blank lines to mark document 
boundaries, you should have many documents in your training data. Common 
mistake is to train with only one document, that is ok for training but not for 
our eval tools.

Please reopen this in case there is some bug causing it.

> OpenNlp NameFinderCrossValidation gives InsufficientTrainingDataException
> -------------------------------------------------------------------------
>
>                 Key: OPENNLP-1017
>                 URL: https://issues.apache.org/jira/browse/OPENNLP-1017
>             Project: OpenNLP
>          Issue Type: Bug
>            Reporter: Saurabh Jain
>
> OpenNlp NameFinderCrossValidation gives InsufficientTrainingDataException.
> With nfold value 3, I tried to cross validate NameFinder training data. After 
> doing a research I got to know that first partition is assinged null data.



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