code: def testString(self):
      tf_ans = sparse_ops.sparse_to_dense([1, 3], [5], "a", "b")
      np_ans = np.array(["b", "a", "b", "a", "b"]).astype(np.string_)
      self.assertAllEqual(np_ans, tf_ans)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import sparse_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the SparseToDenseTest obj's underlying member method code with example usage: obj.testString() without return types