code: def _warning(s):
      warnings.warn(
          "scipy.cluster: %s" % s, ClusterWarning, stacklevel=3
      )
  
imports: import warnings
  import bisect
  from collections import deque
  import numpy
  from .None import _hierarchy, _optimal_leaf_ordering
  import scipy.spatial.distance
  from scipy._lib._array_api import array_namespace, as_xparray, copy
  from scipy._lib._disjoint_set import DisjointSet
label_desc: Use image node_id 1 for calling a global function with example usage: _warning(s) without return types