code: def test_shuffle_on_by_default(self):
      builder = self.create_base_builder()
  
      # base builder already marks two layers as updatable
      self.assertTrue(
          builder.nn_spec.updateParams.shuffle.defaultValue,
          "Shuffle not turned on by default for updatable models",
      )
  
imports: import os
  import shutil
  import tempfile
  import unittest
  import numpy
  import coremltools.models.datatypes
  from coremltools.models import MLModel
  from coremltools.models.neural_network import AdamParams, NeuralNetworkBuilder, SgdParams, quantization_utils
  from coremltools.models.pipeline import PipelineClassifier, PipelineRegressor
  from coremltools.models.utils import save_spec
label_desc: Use image node_id 20 for calling the MLModelUpdatableTest obj's underlying member method code with example usage: obj.test_shuffle_on_by_default() without return types