code: def test_identify_fans_2d(self):
      self.assertEqual((10, 20), identify_fans((10, 20)))
      self.assertEqual((20, 10), identify_fans((20, 10)))
  
imports: import math
  from scipy import stats
  import numpy
  from neupy import init
  from neupy.init import identify_fans
  from base import BaseTestCase
label_desc: Use image node_id 2 for calling the FanIdentifierTestCase obj's underlying member method code with example usage: obj.test_identify_fans_2d() without return types