Book Image

Python Natural Language Processing Cookbook

By : Zhenya Antić
Book Image

Python Natural Language Processing Cookbook

By: Zhenya Antić

Overview of this book

Python is the most widely used language for natural language processing (NLP) thanks to its extensive tools and libraries for analyzing text and extracting computer-usable data. This book will take you through a range of techniques for text processing, from basics such as parsing the parts of speech to complex topics such as topic modeling, text classification, and visualization. Starting with an overview of NLP, the book presents recipes for dividing text into sentences, stemming and lemmatization, removing stopwords, and parts of speech tagging to help you to prepare your data. You’ll then learn ways of extracting and representing grammatical information, such as dependency parsing and anaphora resolution, discover different ways of representing the semantics using bag-of-words, TF-IDF, word embeddings, and BERT, and develop skills for text classification using keywords, SVMs, LSTMs, and other techniques. As you advance, you’ll also see how to extract information from text, implement unsupervised and supervised techniques for topic modeling, and perform topic modeling of short texts, such as tweets. Additionally, the book shows you how to develop chatbots using NLTK and Rasa and visualize text data. By the end of this NLP book, you’ll have developed the skills to use a powerful set of tools for text processing.
Table of Contents (10 chapters)

Sentiment for short texts using LSTM: Twitter

In this recipe, we will apply the LSTM algorithm to Twitter data, which we will classify by positive and negative sentiment. This will be similar to the Using LSTMs for supervised text classification recipe in the previous chapter. By the end of the recipe, you will be able to load and clean the data, and create and train an LSTM model for sentiment prediction.

Getting ready

For this recipe, we will use the same deep learning packages as before, and an additional package to segment Twitter hashtags, which can be downloaded at https://github.com/jchook/wordseg. After downloading, install it using this command:

python setup.py install

We also need to download the Twitter dataset, which can be found at https://www.kaggle.com/kazanova/sentiment140.

We will also use the tqdm package to see the progress of functions that take a long time to complete. Install it using the following:

pip install tqdm

How to do it…

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