code: def test_docstring_example1(self):
      data = [True, False, False, True]
      result = create_feature_bitmask_op.create_feature_bitmask(data)
      self.assertAllEqual(result, 0b1001)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.platform import test
  from tensorflow_text.python.ops import create_feature_bitmask_op
label_desc: Use image node_id 1 for calling the CreateFeatureBitmaskOpTest obj's underlying member method code with example usage: obj.test_docstring_example1() without return types