code: def _get_column_names(batch, postfix):
      return [column.name for column in _get_columns(batch, postfix)]
  
imports: from __future__ import print_function, division, absolute_import
  import collections
  import numpy
  from ..None import imgaug
  from .None import normalization
  from .None import utils
label_desc: Use image node_id 1 for calling a global function with example usage: _get_column_names(batch, postfix) and returns: unknown