docstr: Test that concat is correctly computed.
docstr_tok: ["Test","that","concat","is","correctly","computed","."]
code: def test_concat(self):
      """Test that concat is correctly computed."""
      t0 = torch.zeros(10, dtype=torch.int)
      t1 = torch.ones(10, dtype=torch.int)
      da = DataAttribute(torch.cat([t0, t1]), "task_labels")
      self.assertEqual(
          list(da.concat(da).data), list(torch.cat([t0, t1, t0, t1]))
      )
  
file_path: avalanche/tests/benchmarks/utils/test_data_attribute.py
imports: import unittest
  import numpy
  import torch
  from avalanche.benchmarks.utils import _taskaware_classification_subset, make_avalanche_dataset
  from avalanche.benchmarks.utils.data_attribute import DataAttribute, TensorDataAttribute
label_desc: Use image node_id 5 for calling the DataAttributeTests obj's underlying member method code with example usage: obj.test_concat() without return types