code: def test_npu(self):
      data = {
          "test1": torch.zeros((2, 2), dtype=torch.float32).to("npu:0"),
          "test2": torch.zeros((2, 2), dtype=torch.float16).to("npu:0"),
      }
      local = "./tests/data/out_safe_pt_mmap_small_npu.safetensors"
      save_file(data, local)
  
      reloaded = load_file(local, device="npu:0")
      for k, v in reloaded.items():
          self.assertTrue(torch.allclose(data[k], reloaded[k]))
  
imports: import sys
  import unittest
  import torch
  from safetensors import safe_open
  from safetensors.torch import load, load_file, save, save_file
label_desc: Use image node_id 9 for calling the TorchTestCase obj's underlying member method code with example usage: obj.test_npu() without return types