code: def _uint8_tensor_to_string(t):
      return np.array(t).tobytes().decode()
  
imports: from nvidia.dali import pipeline_def
  import os
  import numpy
  from nvidia.dali import fn
  from test_utils import get_dali_extra_path
  from nose_utils import raises
  import tempfile
label_desc: Use image node_id 1 for calling a global function with example usage: _uint8_tensor_to_string(t) and returns: np