code: def _SparseTensor_String3x3(self):
      # [    a]
      # [b    ]
      # [c   d]
      ind = np.array([[0, 2], [1, 0], [2, 0], [2, 2]])
      val = np.array(["a", "b", "c", "d"])
      shape = np.array([3, 3])
      return sparse_tensor.SparseTensor(
          constant_op.constant(ind, dtypes.int64),
          constant_op.constant(val, dtypes.string),
          constant_op.constant(shape, dtypes.int64),
      )
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import sparse_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 10 for calling the SparseConcatTest obj's underlying member method code with example usage: obj._SparseTensor_String3x3() and returns: sparse_tensor