code: def test_ill_opts(self):
      chn_input = torch.ones((1, 2, 3))
      chn_target = torch.ones((1, 2, 3))
      with self.assertRaisesRegex(ValueError, ""):
          FocalLoss(reduction="unknown")(chn_input, chn_target)
  
imports: from __future__ import annotations
  import unittest
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from parameterized import parameterized
  from monai.losses import FocalLoss
  from monai.networks import one_hot
  from tests.utils import test_script_save
label_desc: Use image node_id 12 for calling the TestFocalLoss obj's underlying member method code with example usage: obj.test_ill_opts() without return types