class_docstr: Test the empty regularizer.
code: def _expected_penalty(
      self, x: torch.FloatTensor
  ) -> torch.FloatTensor:  # noqa: D102
      return torch.zeros(1, device=x.device, dtype=x.dtype)
  
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 NoRegularizerTest obj's underlying member method code with example usage: obj._expected_penalty(x) and returns: torch