code: def _reset_partition_file(self):
      test_partitioner = ImageSetsPartitioner()
      test_partitioner.initialise(
          test_sections,
          new_partition=True,
          ratios=(0.2, 0.2),
          data_split_file=partition_output,
      )
  
file_path: NiftyNet/tests/image_sets_partitioner_test.py
imports: from __future__ import absolute_import, print_function
  import os
  import tensorflow
  from niftynet.io.image_sets_partitioner import COLUMN_UNIQ_ID
  from niftynet.io.image_sets_partitioner import ImageSetsPartitioner
  from niftynet.engine.signal import TRAIN, VALID, INFER
  from niftynet.utilities.util_common import ParserNamespace
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 4 for calling the ImageSetsPartitionerIllPartition obj's underlying member method code with example usage: obj._reset_partition_file() without return types