code: def test_duplicate_axis(self):
      with self.assertRaises(ValueError):
          functions.logsumexp(self.x, (0, 0))
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_logsumexp.py
imports: import unittest
  import numpy
  from chainer import functions
  from chainer import testing
  from chainer.utils import force_array
label_desc: Use image node_id 4 for calling the TestLogSumExpInvalidAxis obj's underlying member method code with example usage: obj.test_duplicate_axis() without return types