[sklearn][tensorflow][keras] Train-Validation-Test split

train_ratio = 0.75
validation_ratio = 0.15
test_ratio = 0.10

# train is now 75% of the entire datasets
x_train, x_test, y_train, y_test = train_test_split(dataX, dataY, test_size=1 - train_ratio)

# test is now 10% of the initial datasets
# validation is now 15% of the initial datasets
x_val, x_test, y_val, y_test = train_test_split(x_test, y_test, test_size=test_ratio/(test_ratio + validation_ratio))

print(x_train, x_val, x_test)