code: def test_unique(self):
      dataset_a = tabular.from_data(np.arange(10))
      dataset_b = tabular.from_data(np.arange(10))
      self.assertNotEqual(dataset_a.keys, dataset_b.keys)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.dataset import tabular
  from chainer import testing
label_desc: Use image node_id 25 for calling the TestFromData obj's underlying member method code with example usage: obj.test_unique() without return types