Damiano,
   You are treading in some dangerous waters.  You need to open up the black 
box of the model and peek inside.  I open up the NER model and get the maxent 
model inside.  I make the context using the feature generator, then I get the 
context map inside the maxent model to lookup the weights.  I am grossly 
oversimplifying the process because otherwise I would be writing a treatise on 
OpenNLP.  I would suggest looking at the find() method and align what that 
method does with my comments on the steps you need to take.

Hope it helps...
Daniel

> On Jan 30, 2018, at 12:10 PM, Damiano Porta <damianopo...@gmail.com> wrote:
> 
> Hello everybody,
> 
> how can we understand what are the most important features during the NER
> process? I mean.. when the TokenNameFinder selects a label is it possible
> to retrieve the most important features too ?
> 
> Thanks
> Damiano

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