code: def test_functional_ignore_index_with_different_value(self):
      actual = acc(self.predictions, self.targets, ignore_index=-1)
      self.assertEqual((), actual.shape)
      self.assertAlmostEqual(1 / 3 * 100, float(actual), places=5)
  
imports: from unittest import TestCase, skipIf
  import numpy
  import torch
  from poutyne import Accuracy, BinaryAccuracy, TopKAccuracy, acc, bin_acc, topk
label_desc: Use image node_id 5 for calling the IgnoreIndexAccuracyTest obj's underlying member method code with example usage: obj.test_functional_ignore_index_with_different_value() without return types