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Natural Language Processing and Computational Linguistics

You're reading from   Natural Language Processing and Computational Linguistics A practical guide to text analysis with Python, Gensim, spaCy, and Keras

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788838535
Length 306 pages
Edition 1st Edition
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Author (1):
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Bhargav Srinivasa-Desikan Bhargav Srinivasa-Desikan
Author Profile Icon Bhargav Srinivasa-Desikan
Bhargav Srinivasa-Desikan
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Table of Contents (17) Chapters Close

Preface 1. What is Text Analysis? 2. Python Tips for Text Analysis FREE CHAPTER 3. spaCy's Language Models 4. Gensim – Vectorizing Text and Transformations and n-grams 5. POS-Tagging and Its Applications 6. NER-Tagging and Its Applications 7. Dependency Parsing 8. Topic Models 9. Advanced Topic Modeling 10. Clustering and Classifying Text 11. Similarity Queries and Summarization 12. Word2Vec, Doc2Vec, and Gensim 13. Deep Learning for Text 14. Keras and spaCy for Deep Learning 15. Sentiment Analysis and ChatBots 16. Other Books You May Enjoy

Similarity queries

Now that we have the capability to compare between two documents, it is possible for us to set up our algorithms to extract out the most similar documents for an input query simply index each of the documents, then search for the lowest distance value returned between the corpus and the query, and return the documents with the lowest distance values these would be most similar. Luckily for us, however, Gensim has in-built structures to do this document similarity task!

We will be using the similarities module to construct this structure.

from gensim import similarities

We previously mentioned creating an index we can do this far faster with the similarities module. As mentioned in the Gensim documentation for the Similarity class the Similarity class splits the index into several smaller subindexes (shards), which are disk...

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