title: ne_chunk without pos_tag in NLTK
body: <p>I'm trying to chunk a sentence using ne_chunk and pos_tag in nltk.</p>
  
  <pre><code>from nltk import tag
  from nltk.tag import pos_tag
  from nltk.tree import Tree
  from nltk.chunk import ne_chunk
  
  sentence = "Michael and John is reading a booklet in a library of Jakarta"
  tagged_sent = pos_tag(sentence.split())
  
  print_chunk = [chunk for chunk in ne_chunk(tagged_sent) if isinstance(chunk, Tree)]
  
  print print_chunk
  </code></pre>
  
  <p>and this is the result:</p>
  
  <pre><code>[Tree('GPE', [('Michael', 'NNP')]), Tree('PERSON', [('John', 'NNP')]), Tree('GPE', [('Jakarta', 'NNP')])]
  </code></pre>
  
  <p>my question, is it possible not to include pos_tag (like NNP above) and only include Tree 'GPE','PERSON'?
  and what 'GPE' means?</p>
  
  <p>Thanks in advance</p>