code: def _dtype_names_to_string(dtypes):
      if isinstance(dtypes, set):
          dtypes = list(sorted(dtypes))
      return ", ".join([np.dtype(dt).name for dt in dtypes])
  
imports: from __future__ import print_function, division, absolute_import
  import numpy
  import six.moves
  import imgaug
label_desc: Use image node_id 20 for calling a global function with example usage: _dtype_names_to_string(dtypes) and returns: str