code: def _total_variaion_tester(preds, target, reduction="mean"):
      return total_variation(preds, reduction)
  
imports: from functools import partial
  from typing import Any
  import pytest
  import torch
  from kornia.losses import total_variation
  from torchmetrics.functional.image.tv import total_variation
  from torchmetrics.image.tv import TotalVariation
  from unittests import _Input
  from unittests.helpers import seed_all
  from unittests.helpers.testers import MetricTester
label_desc: Use image node_id 1 for calling a global function with example usage: _total_variaion_tester(preds, target, reduction) and returns: total_variation