code: def _convert_dtype_strs_to_types_cached(dtypes):
      dtypes_parsed = _DTYPE_STR_TO_DTYPES_CACHE.get(dtypes, None)
      if dtypes_parsed is None:
          dtypes_parsed = _convert_dtype_strs_to_types_cached(dtypes)
          _DTYPE_STR_TO_DTYPES_CACHE[dtypes] = dtypes_parsed
      return dtypes_parsed
  
imports: from __future__ import print_function, division, absolute_import
  import numpy
  import six.moves
  import imgaug
label_desc: Use image node_id 16 for calling a global function with example usage: _convert_dtype_strs_to_types_cached(dtypes) and returns: dtypes_parsed