code: def small_inputs(self):
      metric = MultiScaleSSIMMetric(spatial_dims=2)
  
      with self.assertRaises(ValueError):
          metric(
              torch.randn(1, 1, 16, 16, 16),
              torch.randn(1, 1, 16, 16, 16),
          )
  
file_path: MONAI/tests/test_compute_multiscalessim_metric.py
imports: from __future__ import annotations
  import unittest
  import torch
  from monai.metrics import MultiScaleSSIMMetric
  from monai.utils import set_determinism
label_desc: Use image node_id 6 for calling the TestMultiScaleSSIMMetric obj's underlying member method code with example usage: obj.small_inputs() without return types