text: from sklearn.preprocessing import StandardScaler
  from sklearn.model_selection import train_test_split
  from sklearn.datasets import load_digits
  
  
  digits = load_digits()
  X_scale = StandardScaler()
  X = X_scale.fit_transform(digits.data)
  y = digits.target   # target
  X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.4) 
  print(X[0, :])
  