code: def _flush_gradient_swapper(self, gradient_swapper):
      if gradient_swapper.has_buffers():
          self._start_timer(SWAP_OUT_GRADIENT_TIMER)
          pinned_buffers = gradient_swapper.release_buffers()
          self.swap_buffer_manager.free(pinned_buffers)
          self._stop_timer(SWAP_OUT_GRADIENT_TIMER)
          self.timer_names.add(SWAP_OUT_GRADIENT_TIMER)
          self.timer_names.update(gradient_swapper.get_timer_names())
  
imports: import os
  import torch
  from deepspeed import comm
  from deepspeed.utils.logging import logger
  from deepspeed.runtime.swap_tensor.constants import *
  from deepspeed.runtime.swap_tensor.utils import swap_in_tensors, swap_out_tensors, MIN_AIO_BYTES, AIO_ALIGNED_BYTES, get_sized_buffers
  from deepspeed.runtime.swap_tensor.utils import SwapBufferManager, SwapBufferPool
  from deepspeed.accelerator import get_accelerator
label_desc: Use image node_id 7 for calling the OptimizerSwapper obj's underlying member method code with example usage: obj._flush_gradient_swapper(gradient_swapper) without return types