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

Summary

This chapter focused on how to design an infographic to deliver very rich content. LDA topic models result in a set of topics and every topic has a distribution of words. How should we design such an infographic? When we visualize the LDA results, we first want to know the size of a topic, i.e., the percentage of documents for that topic. Then we want to know the similarities or differences between topics. This can be shown by the distances between topics. Then we want to see the distribution of words. It will be ideal to see the distribution of words in the entire corpus, and then be able to choose a topic to see the distribution of words for that topic.

The pyLDAvis library facilitates well-designed interactive infographics. It lets us show the similarities and differences between topics. It shows the distribution of words in the entire corpus, then it lets you choose a topic to see the distribution of words for the topic.

What are other ways to conduct topic modeling...