X_train X_test y_train y_test = train_test_splitX y test_size=02 random_state=0NameError name train_test_split is not defined

This error occurs because the function train_test_split() is not defined in the current environment. It is likely that the required library or module has not been imported yet. To resolve this error, you need to import the necessary library or module that contains the train_test_split() function. For example, if you are using scikit-learn library, you can import the function using the following statement:

from sklearn.model_selection import train_test_split

Make sure to import this statement before using the train_test_split() function