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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

Naive Bayes in scikit-learn


scikit-learn implements three Naive Bayes variants based on the same number of different probabilistic distributions: Bernoulli, Multinomial, and Gaussian. The first one is a binary distribution, and is useful when a feature can be present or absent. The second one is a discrete distribution and is used whenever a feature must be represented by a whole number (for example, in NLP, it can be the frequency of a term), while the third is a continuous distribution characterized by its mean and variance.

Bernoulli Naive Bayes

If X is a Bernoulli-distributed random variable, it can have only two possible outcomes (for simplicity, let's call them 0 and 1) and their probability is this:

In general, the input vectors xi are assumed to be multivariate Bernoulli distributed and each feature is binary and independent. The parameters of the model are learned according to a frequency count. Hence, if there are n samples with m features, the probability for the ith feature is this...

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