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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

Visualizing your Word2Vec model with t-SNE

When we attempt to visualize a high-dimensional vector to a 2D plot, we have to reduce the dimensions first. The most popular dimension reduction technique probably is Principal Component Analysis (PCA). However, PCA has limitations, as I have outlined in the article Dimension reduction with Python (https://towardsdatascience.com/dimension-reduction-techniques-with-python-f36ca7009e5c) [3]. In this section, I will give a brief introduction to t-SNE and use it to visualize our model.

t-SNE is the abbreviation for t-distributed Stochastic Neighbor Embedding. It was developed by Laurens van der Maaten and Geoffrey Hinton in their paper [4]. It is a dimensionality reduction technique used for visualizing high-dimensional data in a low-dimensional space. It preserves the local structure of the data while revealing the underlying global patterns. Let’s see the graph about the Swiss roll in Figure 7.13. If we just simply collapse the roll...

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