code: def test_pin_memory():
      from speechbrain.dataio.batch import PaddedBatch
  
      batch = PaddedBatch(
          [
              {
                  "id": "ex1",
                  "foo": torch.Tensor([1.0]),
                  "bar": torch.Tensor([1.0, 2.0, 3.0]),
              },
              {
                  "id": "ex2",
                  "foo": torch.Tensor([2.0, 1.0]),
                  "bar": torch.Tensor([2.0]),
              },
          ]
      )
      batch.pin_memory()
      assert batch.foo.data.is_pinned()
  
imports: import pytest
  import torch
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: test_pin_memory() without return types