Book Image

The Handbook of NLP with Gensim

By : Chris Kuo
Book Image

The Handbook of NLP with Gensim

By: Chris Kuo

Overview of this book

Navigating the terrain of NLP research and applying it practically can be a formidable task made easy with The Handbook of NLP with Gensim. This book demystifies NLP and equips you with hands-on strategies spanning healthcare, e-commerce, finance, and more to enable you to leverage Gensim in real-world scenarios. You’ll begin by exploring motives and techniques for extracting text information like bag-of-words, TF-IDF, and word embeddings. This book will then guide you on topic modeling using methods such as Latent Semantic Analysis (LSA) for dimensionality reduction and discovering latent semantic relationships in text data, Latent Dirichlet Allocation (LDA) for probabilistic topic modeling, and Ensemble LDA to enhance topic modeling stability and accuracy. Next, you’ll learn text summarization techniques with Word2Vec and Doc2Vec to build the modeling pipeline and optimize models using hyperparameters. As you get acquainted with practical applications in various industries, this book will inspire you to design innovative projects. Alongside topic modeling, you’ll also explore named entity handling and NER tools, modeling procedures, and tools for effective topic modeling applications. By the end of this book, you’ll have mastered the techniques essential to create applications with Gensim and integrate NLP into your business processes.
Table of Contents (24 chapters)
1
Part 1: NLP Basics
5
Part 2: Latent Semantic Analysis/Latent Semantic Indexing
9
Part 3: Word2Vec and Doc2Vec
12
Part 4: Topic Modeling with Latent Dirichlet Allocation
18
Part 5: Comparison and Applications

Chapter 3 – Text Wrangling and Preprocessing

  1. Tokenization is the process of splitting a string into a list of tokens.
  2. The technique to extract the root form of words is called stemming.
  3. There is a slight difference between lemmatization and stemming. Lemmatization converts a word to a meaningful base word. The base word is still an actual word. Stemming converts a word to its root form and may not be a common formal word (such as ‘populated’ becoming ‘popul’).
  4. spaCy does not automatically remove stop words but rather gives users full control of stop-word removal. It simply tags stop words for us to remove them.
  5. PoS labels the correct meaning of a word in a sentence according to its context. It is a system where a word is assigned a syntactic function such as noun, pronoun, adjective, verb, and so on.
  6. Gensim’s preprocess_string class performs all text preprocessing tasks including stop-word removal, tagging, punctuation...