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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

Creating training and test sets


When a dataset is large enough, it's a good practice to split it into training and test sets, the former to be used for training the model and the latter to test its performances. In the following diagram, there's a schematic representation of this process:

Training/test set split process schema

There are two main rules in performing such an operation:

  • Both datasets must reflect the original distribution
  • The original dataset must be randomly shuffled before the split phase in order to avoid a correlation between consequent elements

With scikit-learn, this can be achieved by using the train_test_split() function:

fromsklearn.model_selectionimporttrain_test_split

X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=0.25, random_state=1000)

 

 

 

 

The test_size parameter (as well as training_size) allows you to specify the percentage of elements to put into the test/training set. In this case, the ratio is 75 percent for training and 25 percent for the...

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