code: def test_num_iters_small_raises(self, num_iters):
      with self.assertRaisesRegexp(ValueError, "positive"):
          kashin.KashinHadamardEncodingStage(num_iters=num_iters)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import itertools
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_model_optimization.python.core.internal.tensor_encoding.stages.research import kashin
  from tensorflow_model_optimization.python.core.internal.tensor_encoding.testing import test_utils
label_desc: Use image node_id 18 for calling the KashinHadamardEncodingStageTest obj's underlying member method code with example usage: obj.test_num_iters_small_raises(num_iters) without return types