code: def _missing_warn():
      """Print a warning when called."""
      warnings.warn(
          "One of the clusters is empty. "
          "Re-run kmeans with a different initialization."
      )
  
imports: from __future__ import division, print_function, absolute_import
  import warnings
  import numpy
  from collections import deque
  from scipy._lib._util import _asarray_validated
  from scipy._lib.six import xrange
  from scipy.spatial.distance import cdist
  from .None import _vq
label_desc: Use image node_id 9 for calling a global function with example usage: _missing_warn() without return types