code: def _construct_groups(self, groups):
      in_groups = None
      num_groups = 0
      if groups is not None:
          num_groups = len(groups)
          groups = np.asarray(groups, dtype=np.int32, order="C")
          in_groups = groups.ctypes.data_as(POINTER(c_int32))
  
      return in_groups, num_groups
  
imports: from sklearn.base import BaseEstimator
  from sklearn.base import RegressorMixin, ClassifierMixin
  from sklearn.metrics import mean_squared_error, accuracy_score
  import numpy
  import scipy.sparse
  import statistics
  from sklearn.utils import check_X_y
  from ctypes import *
  from os import path
  from sys import platform
label_desc: Use image node_id 3 for calling the TGBMModel obj's underlying member method code with example usage: obj._construct_groups(groups) and returns: in_groups,  num_groups