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

Putting the model into production

Recall that in LSI Gensim we loaded four objects: the dictionary list, the model, the BoW object, and the TF-IDF object. In Doc2Vec, we only need to load the model object. This is because Doc2Vec does not build on BoW or TF-IDF. I also load the training data just for convenience. It is not required in real-time production.

How do we use Doc2Vec in production? It can be used just like a search engine to retrieve relevant documents based on keyword search. It can also be used to return similar articles to an article of choice. I will demonstrate both use cases. Before that, let’s see how to load your model and training data.

Loading the model

Gensim has a get_tmpfile utility function that points to the physical location of the file. We will use it to reference the location of the model to load the model:

from gensim.test.utils import get_tmpfilefname = get_tmpfile(path + "/doc2vec.model")
model = Doc2Vec.load(fname)

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