code: def test_get_metric_on_new_object_works(self, device: str):
      recall = UnigramRecall()
  
      actual_recall = recall.get_metric(reset=True)["unigram_recall"]
      assert_allclose(actual_recall, 0)
  
file_path: allennlp/tests/training/metrics/unigram_recall_test.py
imports: from typing import Any, Dict, List, Tuple, Union
  import torch
  from torch.testing import assert_allclose
  from allennlp.common.testing import AllenNlpTestCase, multi_device, global_distributed_metric, run_distributed_test
  from allennlp.training.metrics import UnigramRecall
label_desc: Use image node_id 4 for calling the UnigramRecallTest obj's underlying member method code with example usage: obj.test_get_metric_on_new_object_works(device) without return types