code: def _initialize_parameters(self, parameters, src_tensors, aio_handle):
      assert len(parameters) == len(src_tensors)
  
      swap_paths = self._get_swap_paths(
          parameters=parameters,
          num_elems=[src.numel() for src in src_tensors],
      )
  
      SWAP_INIT_TIMER = "swap_init_write"
      self._start_timer(SWAP_INIT_TIMER)
  
      pinned_buffers = self.swap_buffer_manager.allocate_all(
          num_elems=self.largest_numel, dtype=self.dtype
      )
      assert pinned_buffers is not None
  
      self._swap_out_unpinned_tensors(
          aio_handle=aio_handle,
          unpinned_tensors=src_tensors,
          dest_paths=swap_paths,
          pinned_buffers=pinned_buffers,
      )
  
      if dist.get_rank() == 0 and SWAPPER_DEBUG_MODE:
          for i, tensor in enumerate(src_tensors):
              logger.info(
                  f"copy_in_fp16_param: fp32_id = {OptimizerSwapper.parameter_id(parameters[i])} index = {i}, swap_num_elem = {src_tensors[i].numel()}"
              )
  
      self.swap_buffer_manager.free(pinned_buffers)
  
      self._stop_timer(SWAP_INIT_TIMER)
      self._log_timers([SWAP_INIT_TIMER])
  
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 13 for calling the OptimizerSwapper obj's underlying member method code with example usage: obj._initialize_parameters(parameters, src_tensors, aio_handle) without return types