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

Comparing BERTopic with LDA

LDA is a classical probabilistic model for topic modeling, whereas BERTopic leverages transformer-based models to create more context-aware and semantically meaningful topic representations. They come from two different literatures, each with its own set of characteristics and applications. The choice between the two depends on the specific needs of your NLP task and the nature of your text data. Here are the key differences between LDA and BERTopic.

Approach

LDA is a generative probabilistic model for topic modeling. It assumes that documents are mixtures of topics, and topics are mixtures of words. LDA aims to discover these underlying topics and the distribution of words within them.

BERTopic, on the other hand, uses transformer-based language models, such as BERT, to generate document embeddings. It then incorporates UMAP for dimensionality reduction, DBSCAN for initial clustering, c-TFIDF to highlight significant terms, and MMR for keyword...