class_docstr: Output Mixin
  
  Mixin class for interfacing with ParallelProcessing when outputs are
  desired.
  
  .. note::
     To use this mixin the instance inheriting it must set the
     ``feature_span`` attribute and ``__no_output__`` flag in ``__init__``.
docstr: Set output columns for prediction array
docstr_tok: ["Set","output","columns","for","prediction","array"]
code: def set_output_columns(self, X, y, job, n_left_concats=0):
      """Set output columns for prediction array"""
      pass
  
imports: import warnings
  from abc import abstractmethod
  import numpy
  from ._base_functions import check_stack, check_params
  from ..None import config
  from ..utils.exceptions import ParallelProcessingError
  from ..externals.sklearn.base import clone, BaseEstimator
label_desc: Use image node_id 1 for calling the OutputMixin obj's underlying member method code with example usage: obj.set_output_columns(X, y, job, n_left_concats) without return types