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

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train_test_split

train_test_split で層別サンプリングを使用する

sklearn.train_test_split function in Python

scikit-learn と train_test_split() を使用した Python でのデータセットの分割

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Parameter "random_state" of "train_test_split()": What Are Potential Values?

sklearn.TRAIN_TEST_SPLIT function (in Python)

train_test_split Explained

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Set a "random_state" to make your code reproducible

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Random State , Train_Test_Split with example.

Use of random_state in train_test_split()

What is "random_state" in train_test_split?

Common Reasons for SyntaxError in Your Python train_test_split Code