code: def test_mixed_precision(self):
      from torch.distributed.fsdp.fully_sharded_data_parallel import (
          MixedPrecision,
      )
      from torch.distributed.fsdp.sharded_grad_scaler import (
          ShardedGradScaler,
      )
  
      for mp_dtype in dtypes:
          env = self.dist_env.copy()
          env["ACCELERATE_MIXED_PRECISION"] = mp_dtype
          with mockenv_context(**env):
              accelerator = Accelerator()
              if mp_dtype == "fp16":
                  dtype = torch.float16
              elif mp_dtype == "bf16":
                  dtype = torch.bfloat16
              mp_policy = MixedPrecision(
                  param_dtype=dtype,
                  reduce_dtype=dtype,
                  buffer_dtype=dtype,
              )
              self.assertEqual(
                  accelerator.state.fsdp_plugin.mixed_precision_policy,
                  mp_policy,
              )
              if mp_dtype == FP16:
                  self.assertTrue(
                      isinstance(accelerator.scaler, ShardedGradScaler)
                  )
              elif mp_dtype == BF16:
                  self.assertIsNone(accelerator.scaler)
              AcceleratorState._reset_state(True)
  
imports: import inspect
  import os
  import torch
  from transformers import AutoModel
  from transformers.testing_utils import mockenv_context
  from transformers.trainer_utils import set_seed
  import accelerate
  from accelerate.accelerator import Accelerator
  from accelerate.state import AcceleratorState
  from accelerate.test_utils.testing import AccelerateTestCase, TempDirTestCase, execute_subprocess_async, require_fsdp, require_multi_device, require_non_cpu, slow
  from accelerate.utils.constants import FSDP_AUTO_WRAP_POLICY, FSDP_BACKWARD_PREFETCH, FSDP_SHARDING_STRATEGY, FSDP_STATE_DICT_TYPE
  from accelerate.utils.dataclasses import FullyShardedDataParallelPlugin
  from accelerate.utils.other import patch_environment
label_desc: Use image node_id 6 for calling the FSDPPluginIntegration obj's underlying member method code with example usage: obj.test_mixed_precision() without return types