code: def test_log(self, device, batch_size, cdtype):
      z = self._make_rand_data(device, cdtype, (batch_size,))
      t = So2(z).log()
      self.assert_close(t, z.imag.atan2(z.real))
  
imports: import pytest
  import torch
  from kornia.geometry.liegroup import So2
  from kornia.geometry.vector import Vector2
  from kornia.testing import BaseTester
label_desc: Use image node_id 14 for calling the TestSo2 obj's underlying member method code with example usage: obj.test_log(device, batch_size, cdtype) without return types