code: def test_init(self):
      with self.assertRaises(AssertionError):
          MaskedBCELoss(eps="a")
  
imports: from unittest import TestCase
  import torch
  from mmocr.models.common.losses import MaskedBalancedBCELoss, MaskedBalancedBCEWithLogitsLoss, MaskedBCELoss, MaskedBCEWithLogitsLoss
label_desc: Use image node_id 2 for calling the TestMaskedBCELoss obj's underlying member method code with example usage: obj.test_init() without return types