code: def convert_label_set_to_ijv(label_set, validate=True):
      return np.concatenate(
          [convert_labels_to_ijv(l[0], validate) for l in label_set],
          axis=0,
      )
  
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 21 for calling a global function with example usage: convert_label_set_to_ijv(label_set, validate) and returns: np