code: def _swap_out_fp16_params(
      self,
      aio_handle,
      fp32_swap_paths,
      fp32_swap_buffers,
      fp16_pinned_tensors,
  ):
      assert len(fp16_pinned_tensors) <= len(fp32_swap_paths)
      swap_out_count = 0
      for i, fp16_tensor in enumerate(fp16_pinned_tensors):
          if not fp32_swap_buffers.has_space(fp16_tensor.numel()):
              fp32_swap_buffers.swap_out(aio_handle)
              fp32_swap_buffers.reset()
  
          pinned_tensor, _ = fp32_swap_buffers.insert_tensor(
              fp16_tensor,
              fp32_swap_paths[i],
              self._io_aligned_numel(fp16_tensor.numel()),
          )
          assert pinned_tensor is not None
          swap_out_count += 1
  
      if len(fp32_swap_buffers.get_swap_tensors()) > 0:
          fp32_swap_buffers.swap_out(aio_handle)
  
      return swap_out_count
  
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 12 for calling the OptimizerSwapper obj's underlying member method code with example usage: obj._swap_out_fp16_params(aio_handle, fp32_swap_paths, fp32_swap_buffers, fp16_pinned_tensors) and returns: swap_out_count