Why do we split data into train test and validation sets?

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What's the Difference between Training and Testing Data in Machine Learning?

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Intuition: Training Set vs. Test Set vs. Validation Set

Use "fit_transform" on training data, but "transform" (only) on testing/new data

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Training and Testing Data Splitting in Python

Train, Test, & Validation Sets explained

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What is the difference between Training dataset and Test dataset?

Training and testing

Use stratified sampling with train_test_split

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