Penn Treebank

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The Penn Treebank Project is the first large-scale treebank dataset annotates phrase structure and Part of Speech Tagging for natural language.


For example, the sentence "John loves Mary" will be labelled like the following:

(S (NP (NNP John))
   (VP (VPZ loves)
       (NP (NNP Mary)))
   (. .))

POS tags



Annotated corpus include:

  • Wall Street Journal (WSJ);
  • The Brown Corpus;
  • Switchboard;
  • ATIS

Relevant Papers