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How do I encode categorical features using scikitlearn
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=irHhDMbw3xo
In order to include categorical features in your Machine Learning model, you have to encode them numerically using dummy or one-hot encoding. But how do you do this correctly using scikit-learn? • In this video, you'll learn how to use OneHotEncoder and ColumnTransformer to encode your categorical features and prepare your feature matrix in a single step. You'll also learn how to include this step within a Pipeline so that you can cross-validate your model and preprocessing steps simultaneously. Finally, you'll learn why you should use scikit-learn (rather than pandas) for preprocessing your dataset. • AGENDA: • 0:00 Introduction • 0:22 Why should you use a Pipeline? • 2:30 Preview of the lesson • 3:35 Loading and preparing a dataset • 6:11 Cross-validating a simple model • 10:00 Encoding categorical features with OneHotEncoder • 15:01 Selecting columns for preprocessing with ColumnTransformer • 19:00 Creating a two-step Pipeline • 19:54 Cross-validating a Pipeline • 21:44 Making predictions on new data • 23:43 Recap of the lesson • 24:50 Why should you use scikit-learn (rather than pandas) for preprocessing? • CODE FROM THIS VIDEO: https://github.com/justmarkham/scikit... • WANT TO JOIN MY NEXT LIVE WEBCAST? Become a member ($5/month): • / dataschool • • === RELATED RESOURCES === • OneHotEncoder documentation: https://scikit-learn.org/stable/modul... • ColumnTransformer documentation: https://scikit-learn.org/stable/modul... • Pipeline documentation: https://scikit-learn.org/stable/modul... • My video on cross-validation: • Selecting the best model in scikit-le... • My video on grid search: • How to find the best model parameters... • My lesson notebook on StandardScaler: https://nbviewer.jupyter.org/github/j... • • === WANT TO GET BETTER AT MACHINE LEARNING? === • 1) WATCH my scikit-learn video series: • Machine learning in Python with sciki... • 2) SUBSCRIBE for more videos: https://www.youtube.com/dataschool?su... • 3) ENROLL in my Machine Learning course: https://www.dataschool.io/learn/ • 4) LET'S CONNECT! • Newsletter: https://www.dataschool.io/subscribe/ • Twitter: / justmarkham • Facebook: / datascienceschool • LinkedIn: / justmarkham
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