title: How to add a custom corpora to local machine in nltk
body: <p>I have a custom corpora that created with data which i need to do some classification. I have the dataset in a same format that movie_reviews corpora contains. According to nltk documentation i use following code to access to movie_reviews corpora. Is there anyway to add any custom corpora to nltk_data/corpora directory and access that corpora as the same way we access existing corpora.</p>
  
  <pre><code>    import nltk
      from nltk.corpus import movie_reviews
  
      documents = [(list(movie_reviews.words(fileid)), category)
           for category in movie_reviews.categories()
           for fileid in movie_reviews.fileids(category)]
  </code></pre>