code: def test_metrics_pos():
      """Test that `pos` operator works and returns a compositional metric."""
      first_metric = DummyMetric(-1)
  
      final_pos = pos(first_metric)
      assert isinstance(final_pos, CompositionalMetric)
      final_pos.update()
      assert torch.allclose(tensor(1), final_pos.compute())
  
imports: from operator import neg, pos
  from typing import Any
  import pytest
  import torch
  from torch import tensor
  from torchmetrics.metric import CompositionalMetric, Metric
label_desc: Use image node_id 27 for calling a global function with example usage: test_metrics_pos() without return types