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Data School - 🤖⚡ scikit-learn tip #31: If you use cross-validation and your samples are NOT in an arbitrary order, shuffling may be required to get meaningful results. Use KFold or StratifiedKFold
Kevin Markham on Twitter: "🤖⚡ scikit-learn tip #34: It's simple to add feature selection to a Pipeline: 1. Use SelectPercentile to keep the highest scoring features 2. Add feature selection after preprocessing