NLP Example

This is an example project to identify question types. At present only the four following question categories are considered: Who, What, When, Affirmation Any sentence that does not fall in any of the above four is considered as "Unknown" type.

Example questions: 
1. What is your name? Type: What
2. When is the show happening? Type: When
3. Is there a cab available for airport? Type: Affirmation 

There are ambiguous cases to handle such as: 
What time does the train leave?(This looks like a what question but is actually a When type).  

Data Sets

• Dataset.label - Question data set. ( http://cogcomp.cs.illinois.edu/Data/QA/QC/train_1000.label )
• Sample-Input.txt : Some random questions

Frameworks/Libararies

• Stanford CoreNLP - for POS Tagging and NER Tagging
• Apache Spark - for data cleansing

Getting Started

These instructions will get you a brief idea on setting up the environment and running on your local machine for development and testing purposes.

Prerequisities

• Java
• StansfordCoreNLP
• Apache Spark

Setup and running tests

1. Run javac and java -version to check the installation

2. Run spark-shell and check if Spark is installed properly.

3. Execute the following commands from terminal to run the tests:

   javac -classpath "Path to required jar files(Spark, StansfordNLP)" Main.java java -classpath "Path to required jar files(Spark, StansfordNLP)" Main

###Classes Please start exploring from Main.java

All classes in this project are listed below:

• DataCleanser.java - To cleanse the data set. Contains the following methods:

  	  `public void cleanse()`      	 
  

• QuestionClassifier.java - Identifies the type of each question as Who, What, When, Affirmation and Unknown. Contains the following method:

  	  `public void start()`
  	  `public void addToMap(String line, String type)`
  	  `public void display()`
  	  `public void writeToFile(String path)`
  

• PosTagger.java - Performs Part of Speech Tagging on a question string. Contains the following method:

  	  `public String tag(String line)`
  

• NamedEntityRecognizer.java - Performs Named Entity Recognition on a question string, contains the following method:

  	  `public String applyNer(String line)`
  

• QuestionTypeConfirmer.java - Checking question types 'When' and 'Affirmation'., contains the following method:

  	  `public boolean checkWhenType(String line, String tagLine, String nerLine)`
  	  `public boolean affirmationCheck(String tagLine)`
  

• Main.java - Main class to test and run the classes in this project.