code: def _SparseTensor_UnknownShape(
      self, ind_shape=None, val_shape=None, shape_shape=None
  ):
      return sparse_tensor.SparseTensor(
          array_ops.placeholder(dtypes.int64, shape=ind_shape),
          array_ops.placeholder(dtypes.float32, shape=val_shape),
          array_ops.placeholder(dtypes.int64, shape=shape_shape),
      )
  
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 1 for calling the SparseConcatTest obj's underlying member method code with example usage: obj._SparseTensor_UnknownShape(ind_shape, val_shape, shape_shape) and returns: sparse_tensor