code: def test_minimum_signed_integers(self):
      a = np.array(
          [1, -(2**7), -(2**7) + 1, 2**7 - 1], dtype=np.int8
      )
      assert_equal(np.argmin(a), 1)
  
      a = np.array(
          [1, -(2**15), -(2**15) + 1, 2**15 - 1], dtype=np.int16
      )
      assert_equal(np.argmin(a), 1)
  
      a = np.array(
          [1, -(2**31), -(2**31) + 1, 2**31 - 1], dtype=np.int32
      )
      assert_equal(np.argmin(a), 1)
  
      a = np.array(
          [1, -(2**63), -(2**63) + 1, 2**63 - 1], dtype=np.int64
      )
      assert_equal(np.argmin(a), 1)
  
imports: import itertools
  from unittest import expectedFailure, skipIf
  import numpy
  import pytest
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, skipIfTorchDynamo, subtest, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
label_desc: Use image node_id 2 for calling the TestArgmin obj's underlying member method code with example usage: obj.test_minimum_signed_integers() without return types