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

Text preprocessing

We discussed earlier that good text preprocessing yields a good model outcome. Text preprocessing includes stop word removal and lemmatization. Some domain-specific common words may be considered too common and can be removed as well. You are advised to perform text preprocessing for LDA modeling too. LSA/LSI, LDA, and Ensemble LDA all require text preprocessing for a better modeling outcome. In contrast, Word2Vec, Doc2Vec, text summarization, and Bidirectional Encoder Representations From Transformers (BERT) topic modeling do not necessarily need text preprocessing.

This chapter uses the same AG’s corpus data of news articles (as mentioned in the Preface) so that you can focus more on learning techniques rather than different datasets. The text preprocessing task here is very similar to that in Chapter 6, Latent Semantic Indexing with Gensim. Hence, I will just go through the same text preprocessing code without offering much detail.

Preprocessing

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