Book Image

Python Natural Language Processing

Book Image

Python Natural Language Processing

Overview of this book

This book starts off by laying the foundation for Natural Language Processing and why Python is one of the best options to build an NLP-based expert system with advantages such as Community support, availability of frameworks and so on. Later it gives you a better understanding of available free forms of corpus and different types of dataset. After this, you will know how to choose a dataset for natural language processing applications and find the right NLP techniques to process sentences in datasets and understand their structure. You will also learn how to tokenize different parts of sentences and ways to analyze them. During the course of the book, you will explore the semantic as well as syntactic analysis of text. You will understand how to solve various ambiguities in processing human language and will come across various scenarios while performing text analysis. You will learn the very basics of getting the environment ready for natural language processing, move on to the initial setup, and then quickly understand sentences and language parts. You will learn the power of Machine Learning and Deep Learning to extract information from text data. By the end of the book, you will have a clear understanding of natural language processing and will have worked on multiple examples that implement NLP in the real world.

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Table of Contents (13 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
Introduction
Introduction
Understanding natural language processing
Understanding basic applications
Advantages of togetherness - NLP and Python
Environment setup for NLTK
Tips for readers
Summary
2
Practical Understanding of a Corpus and Dataset
Practical Understanding of a Corpus and Dataset
What is a corpus?
Why do we need a corpus?
Understanding corpus analysis
Understanding types of data attributes
Exploring different file formats for corpora
Resources for accessing free corpora
Preparing a dataset for NLP applications
Web scraping
Summary
3
Understanding the Structure of a Sentences
Understanding the Structure of a Sentences
Understanding components of NLP
Natural language understanding
Defining context-free grammar
Morphological analysis
Syntactic analysis
Semantic analysis
Handling ambiguity
Discourse integration
Pragmatic analysis
Summary
4
Preprocessing
Preprocessing
Handling corpus-raw text
Handling corpus-raw sentences
Basic preprocessing
Practical and customized preprocessing
Summary
5
Feature Engineering and NLP Algorithms
Feature Engineering and NLP Algorithms
Understanding feature engineering
Basic feature of NLP
Basic statistical features for NLP
Advantages of features engineering
Challenges of features engineering
Summary
6
Advanced Feature Engineering and NLP Algorithms
Advanced Feature Engineering and NLP Algorithms
Recall word embedding
Understanding the basics of word2vec
Converting the word2vec model from black box to white box
Understanding the components of the word2vec model
Understanding the logic of the word2vec model
Understanding algorithmic techniques and the mathematics behind the word2vec model
Algorithms used by neural networks
Some of the facts related to word2vec
Applications of word2vec
Implementation of simple examples
Advantages of word2vec
Challenges of word2vec
How is word2vec used in real-life applications?
When should you use word2vec?
Developing something interesting
Extension of the word2vec concept
Importance of vectorization in deep learning
Summary
7
Rule-Based System for NLP
Rule-Based System for NLP
Understanding of the rule-based system
Purpose of having the rule-based system
Architecture of the RB system
Understanding the RB system development life cycle
Applications
Developing NLP applications using the RB system
Comparing the rule-based approach with other approaches
Advantages of the rule-based system
Disadvantages of the rule-based system
Challenges for the rule-based system
Understanding word-sense disambiguation basics
Discussing recent trends for the rule-based system
Summary
8
Machine Learning for NLP Problems
Machine Learning for NLP Problems
Understanding the basics of machine learning
Development steps for NLP applications
Understanding ML algorithms and other concepts
Hybrid approaches for NLP applications
Summary
9
Deep Learning for NLU and NLG Problems
Deep Learning for NLU and NLG Problems
An overview of artificial intelligence
Comparing NLU and NLG
A brief overview of deep learning
Basics of neural networks
Implementation of ANN
Deep learning and deep neural networks
Deep learning techniques and NLU
Deep learning techniques and NLG
Gradient descent-based optimization
Artificial intelligence versus human intelligence
Summary
10
Advanced Tools
Advanced Tools
Apache Hadoop as a storage framework
Apache Spark as a processing framework
Apache Flink as a real-time processing framework
Visualization libraries in Python
Summary
11
How to Improve Your NLP Skills
How to Improve Your NLP Skills
Beginning a new career journey with NLP
Cheat sheets
Choose your area
Agile way of working to achieve success
Useful blogs for NLP and data science
Grab public datasets
Mathematics needed for data science
Summary
12
Installation Guide
Installation Guide
Installing Python, pip, and NLTK
Installing the PyCharm IDE
Installing dependencies
Framework installation guides
Drop your queries
Summary

Developing something interesting

Here, we are going to train our word2vec model. The dataset that I'm going to use is text data of Game of Thrones. So, our formal goal is to develop word2vec to explore semantic similarities between the entities of A Song of Ice and Fire (from the show Game of Thrones). The good part is we are also doing visualization on top of that, to get a better understanding of the concept practically. The original code credit goes to Yuriy Guts. I have just created a code wrapper for better understanding.

I have used IPython notebook. Basic dependencies are gensim, scikit-learn, and nltk to train the word2vec model on the text data of Game of Thrones. You can find the code on this GitHub link:

https://github.com/jalajthanaki/NLPython/blob/master/ch6/gameofthrones2vec/gameofthrones2vec.ipynb.

 The code contains inline comments and you can see the snippet...
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