code: def cast_labels_to_label_set(labels, validate=True):
      """
      Takes in a 'labels' matrix and casts it into a 1-element 'label_set'
      """
      if validate:
          _validate_labels(labels)
  
      return [(labels, indices_from_labels(labels, validate=False))]
  
imports: from enum import Enum
  import numpy
  from numpy.random.mtrand import RandomState
  import scipy.sparse
  import centrosome.index
label_desc: Use image node_id 14 for calling a global function with example usage: cast_labels_to_label_set(labels, validate) and returns: list