code: def _validate_initial_centers(initial_centers):
      """
      Validate the initial centers.
  
      Parameters
      ----------
      initial_centers : SFrame
          Initial cluster center locations, in SFrame form.
      """
      if not (isinstance(initial_centers, _SFrame)):
          raise TypeError("Input 'initial_centers' must be an SFrame.")
  
      if (
          initial_centers.num_rows() == 0
          or initial_centers.num_columns() == 0
      ):
          raise ValueError(
              "An 'initial_centers' argument is provided "
              + "but has no data."
          )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import logging
  from array import array
  import turicreate
  from turicreate.toolkits._model import Model
  from turicreate.data_structures.sframe import SFrame
  import turicreate.toolkits._internal_utils
  from turicreate.toolkits._private_utils import _validate_row_label
  from turicreate.toolkits._private_utils import _summarize_accessible_fields
  from turicreate.toolkits._main import ToolkitError
  from turicreate._cython.cy_server import QuietProgress
label_desc: Use image node_id 2 for calling a global function with example usage: _validate_initial_centers(initial_centers) without return types