code: def split(self, indices):
      if self.n_splits > 1:
          return self.k_fold.split(indices)
      else:
          return [(indices, indices)]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import argparse
  import sys
  import numpy
  from scipy import misc
  from sklearn.model_selection import KFold
  from scipy import interpolate
  import sklearn
  import cv2
  import math
  import datetime
  import pickle
  from sklearn.decomposition import PCA
  import mxnet
  from mxnet import ndarray
label_desc: Use image node_id 2 for calling the LFold obj's underlying member method code with example usage: obj.split(indices) and returns: self, list