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

I hope this chapter provided systematic guidance for you to understand Word2Vec. In this chapter, we started with the distributional hypothesis, which says if words are semantically similar, they tend to show up in similar contexts and with similar distributions. Word2Vec is almost the quantification of the distributional hypothesis. Word2Vec captures the similarities of words/concepts in vector form. Because vectors imply a measure of distance, Word2Vec enables us to measure the similarities of words or concepts.

We also learned the advantages of Word2Vec over Bag of Words (BOW) and Term Frequency-Inverse Document Frequency (TF-IDF). Word2Vec can also capture the compositional relationships between words. Word2Vec can reduce dimensionality by presenting the high-dimensional space of words in lower-dimensional word vectors. We are also informed that Word2Vec has been applied in many real-world recommendation systems.

We learned how to use a pretrained Word2Vec model and...