Question Classification

Course: Natural Language Processing and Information Retrieval
Instructor: Alessandro Moschitti

Objective: Using Tree Kernels for question classification.

Tasks:

Separate labels and questions
Parse (English grammer using Stanford Parser)
Using Senna for Semantic role labelling and Part of speech tagging
Make PAS from SRL output
Features (Parse Tree, Bag of Words, Bag of Parts of Speech, Predicate Argument Structure, and TF-IDF Vector)
Train Tree kernel on train 5500 with 5-fold cross validation
Test on TREC 2010

Example Tree from a question

Data: TREC 2012 for testing and training questions from "Experimental Data for Question Classification."

Folders:

Class	Definition
ABBREVIATION	abbreviation
abb	abbreviation
exp	expression abbreviated
ENTITY	entities
animal	animals
body	organs of body
color	colors
creative	inventions, books and other creative pieces
currency	currency names
dis.med.	diseases and medicine
event	events
food	food
instrument	musical instrument
lang	languages
letter	letters like a-z
other	other entities
plant	plants
product	products
religion	religions
sport	sports
substance	elements and substances
symbol	symbols and signs
technique	techniques and methods
term	equivalent terms
vehicle	vehicles
word	words with a special property
DESCRIPTION	description and abstract concepts
definition	definition of sth.
description	description of sth.
manner	manner of an action
reason	reasons
HUMAN	human beings
group	a group or organization of persons
ind	an individual
title	title of a person
description	description of a person
LOCATION	locations
city	cities
country	countries
mountain	mountains
other	other locations
state	states
NUMERIC	numeric values
code	postcodes or other codes
count	number of sth.
date	dates
distance	linear measures
money	prices
order	ranks
other	other numbers
period	the lasting time of sth.
percent	fractions
speed	speed
temp	temperature
size	size, area and volume
weight	weight

Languages and tools used

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