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

Image feature extraction with ResNet50

ResNet50 models are trained on the ImageNet dataset. This dataset contains millions of images in over 20,000 categories. The large-scale visual recognition challenge, ILSVRC, focuses on the top 1,000 categories for models to compete on recognizing images. Consequently, the top layers of the ResNet50 that perform classification have a dimension of 1,000. The idea behind using a pre-trained ResNet50 model is that it is already able to parse out objects that may be useful in image captioning.

The tensorflow.keras.applications package provides pre-trained models like ResNet50. At the time of writing, all the pre-trained models provided are related to CV. Loading up the pre-trained model is quite easy. All the code for this section is in the feature-extraction.py file in this chapter's folder on GitHub. The main reason for using a separate file is that it gives us the ability to run feature extraction as a script.

Given that we will...