code: def test_init(self, device, dtype, batch_size):
      q1 = Quaternion.identity(batch_size, device, dtype)
      q2 = Quaternion(q1.data)
      assert isinstance(q2, Quaternion)
      self.assert_close(q1, q2)
  
imports: import pytest
  import torch
  from kornia.geometry.quaternion import Quaternion
  from kornia.testing import assert_close
label_desc: Use image node_id 4 for calling the TestQuaternion obj's underlying member method code with example usage: obj.test_init(device, dtype, batch_size) without return types