code: def test_compute_mcc(self) -> None:
      metrics = compute_classification_metrics(
          PREDICTIONS2, LABEL_NAMES2, loss=5.0
      )
      self.assertAlmostEqual(metrics.mcc, 1.0 / 6)
      # Just to test the metrics print without errors
      metrics.print_metrics()
  
imports: from pytext.metrics import ClassificationMetrics, compute_classification_metrics, compute_soft_metrics, LabelPrediction, MacroPRF1Metrics, MacroPRF1Scores, PRF1Scores, SoftClassificationMetrics
  from pytext.metrics.tests.metrics_test_base import MetricsTestBase
label_desc: Use image node_id 3 for calling the BasicMetricsTest obj's underlying member method code with example usage: obj.test_compute_mcc() without return types