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Natural Language Processing with TensorFlow

Natural Language Processing with TensorFlow

By : Thushan Ganegedara
4.5 (10)
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Natural Language Processing with TensorFlow

Natural Language Processing with TensorFlow

4.5 (10)
By: Thushan Ganegedara

Overview of this book

Natural language processing (NLP) supplies the majority of data available to deep learning applications, while TensorFlow is the most important deep learning framework currently available. Natural Language Processing with TensorFlow brings TensorFlow and NLP together to give you invaluable tools to work with the immense volume of unstructured data in today’s data streams, and apply these tools to specific NLP tasks. Thushan Ganegedara starts by giving you a grounding in NLP and TensorFlow basics. You'll then learn how to use Word2vec, including advanced extensions, to create word embeddings that turn sequences of words into vectors accessible to deep learning algorithms. Chapters on classical deep learning algorithms, like convolutional neural networks (CNN) and recurrent neural networks (RNN), demonstrate important NLP tasks as sentence classification and language generation. You will learn how to apply high-performance RNN models, like long short-term memory (LSTM) cells, to NLP tasks. You will also explore neural machine translation and implement a neural machine translator. After reading this book, you will gain an understanding of NLP and you'll have the skills to apply TensorFlow in deep learning NLP applications, and how to perform specific NLP tasks.
Table of Contents (14 chapters)
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13
Index

Extensions to the word embeddings algorithms

The original paper by Mikolov and others, published in 2013, discusses several extensions that can improve the performance of the word embedding learning algorithms even further. Though they are initially introduced to be used for skip-gram, they are extendable to CBOW as well. Also, as we already saw that CBOW outperforms the skip-gram algorithm in our example, we will use CBOW for understanding all the extensions.

Using the unigram distribution for negative sampling

It has been found that the performance results of negative sampling are better when performed by sampling from certain distributions rather than from the uniform distribution. One such distribution is the unigram distribution. The unigram probability of a word wi is given by the following equation:

Using the unigram distribution for negative sampling

Here, count(wi) is the number of times wi appears in the document. When the unigram distribution is distorted as Using the unigram distribution for negative sampling for some constant Z, it has shown to provide better performance than the...

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