Book Image

Advanced Natural Language Processing with TensorFlow 2

By : Ashish Bansal, Tony Mullen
Book Image

Advanced Natural Language Processing with TensorFlow 2

By: Ashish Bansal, Tony Mullen

Overview of this book

Recently, there have been tremendous advances in NLP, and we are now moving from research labs into practical applications. This book comes with a perfect blend of both the theoretical and practical aspects of trending and complex NLP techniques. The book is focused on innovative applications in the field of NLP, language generation, and dialogue systems. It helps you apply the concepts of pre-processing text using techniques such as tokenization, parts of speech tagging, and lemmatization using popular libraries such as Stanford NLP and SpaCy. You will build Named Entity Recognition (NER) from scratch using Conditional Random Fields and Viterbi Decoding on top of RNNs. The book covers key emerging areas such as generating text for use in sentence completion and text summarization, bridging images and text by generating captions for images, and managing dialogue aspects of chatbots. You will learn how to apply transfer learning and fine-tuning using TensorFlow 2. Further, it covers practical techniques that can simplify the labelling of textual data. The book also has a working code that is adaptable to your use cases for each tech piece. By the end of the book, you will have an advanced knowledge of the tools, techniques and deep learning architecture used to solve complex NLP problems.
Table of Contents (13 chapters)
11
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12
Index

Text Summarization with Seq2seq Attention and Transformer Networks

Summarizing a piece of text challenges a deep learning model's understanding of language. Summarization can be considered a uniquely human ability, where the gist of a piece of text needs to be understood and phrased. In the previous chapters, we have built components that can help in summarization. First, we used BERT to encode text and perform sentiment analysis. Then, we used a decoder architecture with GPT-2 to generate text. Putting the Encoder and Decoder together yields a summarization model. In this chapter, we will implement a seq2seq Encoder-Decoder with Bahdanau Attention. Specifically, we will cover the following topics:

  • Overview of extractive and abstractive text summarization
  • Building a seq2seq model with attention to summarize text
  • Improving summarization with beam search
  • Addressing beam search issues with length normalizations
  • Measuring the performance of summarization...