NLP on the Books of Harry Potter

This repo demonstrates a collection of NLP tasks all using the books of Harry Potter for source documents. Individual tasks can be read about here:

1. Topic modeling with Latent Dirichlet Allocation
2. Regular Expression case study
3. Extractive text summarization
4. Sentiment analysis

Instructions for BasicNLP class (basic_nlp.py)

Functions of the class are topic modeling with LDA, document summarization, and sentiment analysis.

1. Initialize the class with a list of documents and an optional list of document titles, for example:

texts = ['this is the first document', 'this is the second document', 'this is the third document']
titles = ['doc1', 'doc2', 'doc3']

nlp = BasicNLP(texts, titles)

2. LDA:

   1. Create an elbow plot and print the coherence scores by specifying the number of topics to include, with:

      nlp.compute_coherence(start=5, stop=20, step=3)
      

   2. Set the number of topics to use in the model with:

      nlp.set_number_of_topics(10)
      

   3. View the clusters (only available in Jupyter notebook):

      import pyLDAvis
      pyLDAvis.enable_notebook()
      vis = nlp.view_clusters()
      pyLDAvis.display(vis)
      

   4. Get the vocabulary for each topic in the LDA model with (topics can be 'all', a list of integers, or a single integer):

      nlp.get_topic_vocabulary(topics='all', num_words=10)
      

   5. Get the documents most highly associated with the given topics with:

      nlp.get_representative_documents(topics='all', num_docs=1)
      

   6. Get the sentence summaries of the documents most highly associated with the given topics with:

      nlp.get_representative_sentences(topics='all', num_sentences=3)
      

   7. Provide a name for an LDA topic (if preferred over the numbering system) with:

      nlp.name_topic(topic_number=1, topic_name='My topic')
      

3. Document summarization:

   Get the sentence summaries of the requested documents with:

   nlp.get_document_summaries(documents='all', num_sent=5)
   

4. Sentiment analysis:

   Get the sentiment scores (compound, positive, neutral, negative) for the requested documents with:

   nlp.get_sentiment(documents='all')