Use stratified sampling with traintestsplit

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Are you using train_test_split with a classification problem? • Be sure to set stratify=y so that class proportions are preserved when splitting. • Especially important if you have class imbalance! • 👉 New tips every TUESDAY and THURSDAY! 👈 • 🎥 Watch all tips:    • scikit-learn tips   • 🗒️ Code for all tips: https://github.com/justmarkham/scikit... • 💌 Get tips via email: https://scikit-learn.tips • • === WANT TO GET BETTER AT MACHINE LEARNING? === • 1) LEARN THE FUNDAMENTALS in my intro course (free!): https://courses.dataschool.io/introdu... • 2) BUILD YOUR ML CONFIDENCE in my intermediate course: https://courses.dataschool.io/buildin... • 3) LET'S CONNECT! • Newsletter: https://www.dataschool.io/subscribe/ • Twitter:   / justmarkham   • Facebook:   / datascienceschool   • LinkedIn:   / justmarkham  

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