code: def test_different_squad(self):
      ref = "this is a string"
      self.assertDictClose(
          metrics.squad([[ref, ref], [ref, ref]], ["", ""]),
          {"em": 0, "f1": 0},
      )
  
imports: from unittest import mock
  from absl.testing import absltest
  import numpy
  import seqio
  import sklearn.metrics
  from t5.evaluation import metrics
  from t5.evaluation import test_utils
label_desc: Use image node_id 7 for calling the MetricsTest obj's underlying member method code with example usage: obj.test_different_squad() without return types