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Machine Learning Algorithms

Machine Learning Algorithms

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Machine Learning Algorithms

Machine Learning Algorithms

Overview of this book

Machine learning has gained tremendous popularity for its powerful and fast predictions with large datasets. However, the true forces behind its powerful output are the complex algorithms involving substantial statistical analysis that churn large datasets and generate substantial insight. This second edition of Machine Learning Algorithms walks you through prominent development outcomes that have taken place relating to machine learning algorithms, which constitute major contributions to the machine learning process and help you to strengthen and master statistical interpretation across the areas of supervised, semi-supervised, and reinforcement learning. Once the core concepts of an algorithm have been covered, you’ll explore real-world examples based on the most diffused libraries, such as scikit-learn, NLTK, TensorFlow, and Keras. You will discover new topics such as principal component analysis (PCA), independent component analysis (ICA), Bayesian regression, discriminant analysis, advanced clustering, and gaussian mixture. By the end of this book, you will have studied machine learning algorithms and be able to put them into production to make your machine learning applications more innovative.
Table of Contents (24 chapters)
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Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Summary


In this chapter, we introduced topic modeling. We discussed latent semantic analysis based on truncated SVD, PLSA (which aims to build a model without assumptions about latent factor prior probabilities), and LDA, which outperformed the previous method and is based on the assumption that the latent factor has a sparse prior Dirichlet distribution. This means that a document normally covers only a limited number of topics and a topic is characterized by only a few important words.

In the last section, we discussed the basics of Word2vec and the sentiment analysis of documents, which is aimed at determining whether a piece of text expresses a positive or negative feeling. To show a feasible solution, we built a classifier based on an NLP pipeline and a random forest with average performances that can be used in many real-life situations.

In the next chapter, Chapter 15, Introducing Neural Networks, we're going to briefly introduce deep learning, together with the TensorFlow framework...

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