code: def test_double_conjugate(self, device, dtype, batch_size):
      q1 = Quaternion.random(batch_size, device, dtype)
      self.assert_close(q1, q1.conj().conj())
  
imports: import pytest
  import torch
  from kornia.geometry.quaternion import Quaternion
  from kornia.testing import assert_close
label_desc: Use image node_id 15 for calling the TestQuaternion obj's underlying member method code with example usage: obj.test_double_conjugate(device, dtype, batch_size) without return types