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Machine Learning with Swift

You're reading from   Machine Learning with Swift Artificial Intelligence for iOS

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Product type Paperback
Published in Feb 2018
Publisher Packt
ISBN-13 9781787121515
Length 378 pages
Edition 1st Edition
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Authors (3):
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Jojo Moolayil Jojo Moolayil
Author Profile Icon Jojo Moolayil
Jojo Moolayil
Oleksandr Baiev Oleksandr Baiev
Author Profile Icon Oleksandr Baiev
Oleksandr Baiev
Alexander Sosnovshchenko Alexander Sosnovshchenko
Author Profile Icon Alexander Sosnovshchenko
Alexander Sosnovshchenko
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Table of Contents (14) Chapters Close

Preface 1. Getting Started with Machine Learning FREE CHAPTER 2. Classification – Decision Tree Learning 3. K-Nearest Neighbors Classifier 4. K-Means Clustering 5. Association Rule Learning 6. Linear Regression and Gradient Descent 7. Linear Classifier and Logistic Regression 8. Neural Networks 9. Convolutional Neural Networks 10. Natural Language Processing 11. Machine Learning Libraries 12. Optimizing Neural Networks for Mobile Devices 13. Best Practices

Word2Vec in Gensim

There is no point in running Word2Vec on an iOS device: in the app, we need only the vectors it generates. For running Word2Vec, we will use the Python NLP package gensim. This library is popular for topic modeling and contains a fast Word2Vec implementation with a nice API. We don't want to load large corpuses of text on a mobile phone and don't want to train Word2vec on the iOS device, so we will learn a vector representation using the Gensim Python library. Then, we will do some preprocessing (remove everything except nouns) and plug this database into our iOS application:

In [39]: 
import gensim 
In [40]: 
def trim_rule(word, count, min_count): 
    if word not in words_to_keep or word in stop_words: 
        return gensim.utils.RULE_DISCARD 
    else: 
        return gensim.utils.RULE_DEFAULT 
In [41]: 
model = gensim.models.Word2Vec(sentences_to_train_on...
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