Question: In the code below from sklearn.model _ selection import train _ test _ split X _ train, X _ test, Y _ train, Y _

In the code below
from sklearn.model_selection import train_test_split X_train, X_test, Y_train, Y_test = train_test_split(x_no_outliers, y_no_outliers, test_size=0.8, random_state=0, shuffle=True)
What does the command test_size=0.8

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