code: def test_singletone(self):
      loss_output1 = NeuralType(axes=None)
      loss_output2 = NeuralType(axes=None)
  
      assert (
          loss_output1.compare(loss_output2)
          == NeuralTypeComparisonResult.SAME
      )
      assert (
          loss_output2.compare(loss_output1)
          == NeuralTypeComparisonResult.SAME
      )
  
file_path: NeMo/tests/core/test_neural_types.py
imports: import pytest
  from nemo.core.neural_types import AcousticEncodedRepresentation, AudioSignal, AxisKind, AxisKindAbstract, AxisType, ChannelType, ElementType, MelSpectrogramType, MFCCSpectrogramType, NeuralType, NeuralTypeComparisonResult, SpectrogramType, VoidType
label_desc: Use image node_id 6 for calling the TestNeuralTypeSystem obj's underlying member method code with example usage: obj.test_singletone() without return types