code: def test_inexact_delta_z_gpu(self):
      self._test_inexact_delta_z(device=torch.device("cuda"))
  
imports: import unittest
  import basetest_dqn_like
  import numpy
  import pytest
  import torch
  from basetest_training import _TestBatchTrainingMixin
  import pfrl
  from pfrl.agents import CategoricalDQN, categorical_dqn
  from pfrl.agents.categorical_dqn import compute_value_loss, compute_weighted_value_loss
label_desc: Use image node_id 6 for calling the TestApplyCategoricalProjectionToManualCases obj's underlying member method code with example usage: obj.test_inexact_delta_z_gpu() without return types