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

Data visualization with pyLDAvis

In Chapter 11, LDA Modeling, we saved the LDA model and its dictionary for future use. Now we will load the LDA model and the dictionary. The MmCorpus() function loads the BoW object saved previously in the Matrix Market (MM) exchange format. The MM exchange format is a format for matrices. You also can use pickle dump and load to handle the BOW data, as I explained in the previous chapter:

from gensim.models import LdaModelfrom gensim.test.utils import datapath
from gensim.corpora import Dictionary

Load the LDA model on the BoW data:

path = “/content/gdrive/My Drive/data/gensim”bow_file = datapath(path + “/LDA_bow_151”)
lda_bow = LdaModel.load(bow_file)

Load the LDA model on the TF-IDF data:

tfidf_file = datapath(path + “/LDA_tfidf_151”)lda_tfidf = LdaModel.load(tfidf_file)

Load the dictionary:

dict_file = datapath(path + “/gensim_dictionary_AGnews”)model_dict = Dictionary...