class_docstr: Test the combined regularizer.
code: def _expected_penalty(
      self, x: torch.FloatTensor
  ) -> torch.FloatTensor:  # noqa: D102
      assert isinstance(
          self.instance, pykeen.regularizers.CombinedRegularizer
      )
      regularizers = self.instance.regularizers
      return sum(r.weight * r(x) for r in regularizers) / sum(
          r.weight for r in regularizers
      )
  
imports: import unittest
  from typing import Sequence
  import pytest
  import torch
  import unittest_templates
  from torch.nn import functional
  import pykeen.regularizers
  from pykeen.utils import get_expected_norm
  from tests import cases
  from tests.utils import rand
label_desc: Use image node_id 1 for calling the CombinedRegularizerTest obj's underlying member method code with example usage: obj._expected_penalty(x) and returns: unknown