title: Difference between TaggedDocument and TaggedLineDocument in gensim? and How to work with files in a directory?
body: <p>I am new to doc2vec and I wish to classify set of texts using it.</p>
  
  <p>I am confused about TaggedDocument and TaggedLineDocument.</p>
  
  <p>1) What is the difference between two? Is it that TaggedLineDocument is collection of TaggedDocuments?</p>
  
  <p>2) If I have a directory containing all the files, How to generate feature vectors for them? Should I create a new file where each line contains text from the file from the directory?</p>