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

Coding with spaCy

Since the previously mentioned text preprocessing steps are fundamental to NLP, the NLP community has long sensed the demand for an open source library to benefit more researchers. Thus, spaCy was developed and open sourced. It is designed particularly for production use. Researchers can build applications that process massive volumes of text efficiently. Its NLP pipeline handles all the assigned NLP tasks and then stores the results as attributes to each tokenized word.

Figure 3.1 shows how the nlp() pipeline of spaCY works. It takes the raw text, tokenizes the text with its tokenizer, tags each tokenized word with its tagger, and so on. The results are stored as attributes:

tes:

Figure 3.1 – The spaCy pipeline

Figure 3.1 – The spaCy pipeline

Let’s see what they are:

  • tokenizer: This tokenizes the text and turns a string of text into an NLP object.
  • tagger and parser: This assigns part-of-speech (PoS) tags and dependency labels. The PoS...