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 8 – Doc2Vec with Gensim

  1. The abbreviation PV-DBOW stands for Paragraph Vector with Distributed Bag-of Words and PV-DM stands for Paragraph Vectors — Distributed Memory.
  2. The neural network architecture of PV-DBOW is similar to that of Skip-Gram in Word2Vec. The architecture of PV-DM is similar to that of CBOW in Word2Vec.
  3. Doc2Vec has many real-world applications. For example, when you search for a job on LinkedIn or Indeed.com, you see similar job postings presented next to your target job posting. This is done by Doc2Vec.
  4. By giving a whole paragraph a single ID, Doc2Vec considers the paragraph ID as a word. When a word is treated, it can be embedded as a vector.