code: def train_data():
      digit = load_digits(n_class=2)
      return digit.data, digit.target
  
imports: import numpy
  import pytest
  from sklearn.datasets import load_digits
  from sklearn.preprocessing import LabelBinarizer
  from lightning.impl.primal_cd import CDClassifier, CDRegressor
  from lightning.impl.tests.utils import check_predict_proba
label_desc: Use image node_id 1 for calling a global function with example usage: train_data() and returns: digit,  digit