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The Handbook of NLP with Gensim

The Handbook of NLP with Gensim

By : Chris Kuo
5 (6)
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The Handbook of NLP with Gensim

The Handbook of NLP with Gensim

5 (6)
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)
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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

LDA Modeling

In Chapter 9, Understanding Discrete Distribution, and Chapter 10, Latent Dirichlet Allocation, we learned about the Dirichlet distribution and the structure of the LDA model, which equipped you with a sound theoretical background. In this chapter, we will go over the code to build an LDA model. I will touch upon the key decisions in building an LDA model, including text preprocessing, model hyperparameters, the determination of the number of topics, and how to use the model in production to score new documents. This is a special feature in this book that focuses on model implementation in production. In short, we will cover the following topics:

  • Text preprocessing
  • Experimenting with LDA modeling
  • Building LDA models with a different number of topics
  • Determining the optimal number of topics
  • Using the model to score new documents

With the completion of this chapter, you will be able to develop LDA topic models independently. You will also be...

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