code: def test__init__sinkhorn_iterations(self) -> None:
      MSNLoss(sinkhorn_iterations=0)
      with self.assertRaises(ValueError):
          MSNLoss(sinkhorn_iterations=-1)
  
imports: import unittest
  from unittest import TestCase
  import pytest
  import torch
  import torch.nn.functional
  from pytest_mock import MockerFixture
  from torch import distributed
  from torch import nn
  from torch.optim import SGD
  from lightly.loss import msn_loss
  from lightly.loss.msn_loss import MSNLoss
  from lightly.models.modules.heads import MSNProjectionHead
label_desc: Use image node_id 2 for calling the TestMSNLossUnitTest obj's underlying member method code with example usage: obj.test__init__sinkhorn_iterations() without return types