code: def test_tensor_str_empty():
      t = TensorCPU(np.empty(0))
      params = [[], "DALIDataType.FLOAT64", [0]]
      _test_str(t, params, _expected_tensor_str)
  
imports: import numpy
  import nvidia.dali.fn
  import nvidia.dali.types
  import warnings
  from numpy.testing import assert_array_equal
  from nvidia.dali import pipeline_def
  from nvidia.dali.backend_impl import TensorCPU, TensorListCPU, TensorListGPU
  from nvidia.dali.backend_impl import types
  import nvidia.dali
  from nose_utils import assert_raises
  from nose import SkipTest
  from test_utils import dali_type_to_np, py_buffer_from_address, get_device_memory_info
label_desc: Use image node_id 34 for calling a global function with example usage: test_tensor_str_empty() without return types