code: def testConstantStringToSparse(self):
      # Test case for GitHub issue 40633.
      tensor = constant_op.constant(list("ababa"))
      sparse = sparse_ops.from_dense(tensor)
      result = self.evaluate(sparse)
      self.assertAllEqual([[0], [1], [2], [3], [4]], result.indices)
      self.assertAllEqual([b"a", b"b", b"a", b"b", b"a"], result.values)
      self.assertAllEqual([5], result.dense_shape)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  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 sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_grad
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_sparse_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import sparse_grad
  from tensorflow.python.ops import sparse_ops
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 10 for calling the SparseOpsTest obj's underlying member method code with example usage: obj.testConstantStringToSparse() without return types