code: def test_functional(self):
      actual = bin_acc(self.predictions, self.targets)
      self.assertEqual((), actual.shape)
      np.testing.assert_almost_equal(
          self.binary_accuracy, actual, decimal=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 3 for calling the BinaryAccuracyTest obj's underlying member method code with example usage: obj.test_functional() without return types