Natural Language Processing made easy

NLTK Natural Language Processing made easy Elvis Joel D ’Souza Gopi Krishnan Nambiar Ashutosh Pandey

WHAT: Session Objective ,[object Object]

HOW: Session Layout ,[object Object],[object Object],[object Object],[object Object]

Data Structures ,[object Object],[object Object],[object Object],[object Object],[object Object]

List ,[object Object],[object Object],listOfWords = [‘this’,’is’,’a’,’list’,’of’,’words’] listOfRandomStuff = [1,’pen’,’costs’,’Rs.’,6.50]

Tuple ,[object Object],[object Object],Example: ( 100 , 10 , 0.01 ,’ hundred ’ ) Number Square root Reciprocal Number in words

Return a tuple ,[object Object],[object Object],[object Object],One very useful situation is returning multiple values from a function. To return multiple values in many other languages requires creating an object or container of some type.

Dictionary ,[object Object],[object Object],[object Object],{ 1 : ‘ one ’ , 2 : ‘ two ’ , 3 : ‘ three ’ }

Sets ,[object Object],[object Object],[object Object],SetOfBrowsers=set([ ‘IE’,’Firefox’,’Opera’,’Chrome’])

Loop Control - While number = 10

Functions - Syntax ,[object Object],[object Object],[object Object],[object Object]

Modules ,[object Object],[object Object],[object Object]

Import import math The import keyword is used to tell Python, that we need the ‘math’ module. This statement makes all the functions in this module accessible in the program.

Using Modules – An Example print math. sqrt( 100 ) sqrt is a function math is a module math.sqrt(100) returns 10 This is being printed to the standard output

Natural Language Processing (NLP)

Natural Language Processing ,[object Object]

Why NLP ,[object Object],[object Object],[object Object],[object Object],[object Object]

Stemming ,[object Object],[object Object],[object Object]

Part of speech tagging(POS Tagging) ,[object Object],[object Object]

POS tagging - continued ,[object Object],[object Object]

POS Tagging – An Example The ball is red NOUN VERB ADJECTIVE ARTICLE

Parsing– An Example The boy went home NOUN VERB NOUN ARTICLE NP VP The boy went home

Challenges ,[object Object],[object Object]

[object Object],Here goes an example…

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

Exploring Corpora ,[object Object],[object Object]

Loading your own corpus ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NLTK Corpora ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Computing with Language: Simple Statistics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cumulative Frequency Plot for 50 Most Frequently Words in Moby Dick

Parsing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Authorship Attribution An Example

Find nltk @ <python-installation>ibite-packagesltk

The Road Ahead ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Natural Language Processing made easy

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