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

Understanding DBSCAN and CBDBSCAN

DBSCAN stands for Density-Based Spatial Clustering of Applications with Noise. It is a popular clustering algorithm based on the density of data points to identify clusters. Checkback DBSCAN (CBDBSCAN) is an extension of DBSCAN and is employed in Ensemble LDA. Let’s first learn about DBSCAN, then why the extension is needed in CBDBSCAN.

DBSCAN

DBSCAN, an unsupervised machine learning algorithm, is often used for clustering data points based on their density and proximity to each other. Before learning about the algorithm, let’s get familiar with a few terms in DBSCAN. The first is epsilon. It is a parameter that controls the maximum distance between data points in a cluster. The value of epsilon is set before running the algorithm. It should be small enough to capture the density of the clusters but not so small that it creates too many clusters. The second term is minPts. It is the minimum number of neighbors required for a point...