title: How to use Mallet for NER
body: <p>I'm new to the subject of NLP and requested to perform -named entity recognition- (NER) using Mallet.
  I have a text, and I give feature vector for each word in it. I would like to train a model which later on I can test on fresh text file.
  My question is how do I create such model, what is the input for the model. I could use some code examples :) 
  Thanks !</p>