code: def setUp(self):
      self.train_samples = 100
      self.test_samples = 50
      self.input_shape = (28, 28)
      self.num_classes = 10
  
imports: import numpy
  from absl.testing import parameterized
  from keras.testing import test_case
  from keras.testing import test_utils
label_desc: Use image node_id 1 for calling the ClassDistributionTests obj's underlying member method code with example usage: obj.setUp() without return types