code: def _swap_in_fp16_params(
      self,
      aio_handle,
      fp16_num_elems,
      fp16_partitions_info,
      fp16_swap_buffers,
  ):
      assert len(fp16_num_elems) > 0
  
      swapped_fp16_tensors = []
      swap_tensors = []
      swap_paths = []
      unswapped_srcs = []
      unswapped_dsts = []
  
      for i, numel in enumerate(fp16_num_elems):
          pinned_tensor, _ = fp16_swap_buffers.allocate_tensor(
              numel, None, numel
          )
          if pinned_tensor is None:
              break
  
          swapped_fp16_tensors.append(pinned_tensor)
          offset = 0
          for (
              tensor,
              partition_numel,
              partition_path,
          ) in fp16_partitions_info[i]:
              dst_tensor = pinned_tensor.narrow(
                  0, offset, partition_numel
              )
              if partition_path is None:
                  unswapped_srcs.append(tensor)
                  unswapped_dsts.append(dst_tensor)
              else:
                  swap_paths.append(partition_path)
                  swap_tensors.append(dst_tensor)
              offset += partition_numel
  
      assert len(swapped_fp16_tensors) + len(unswapped_srcs) > 0
      ret = swap_in_tensors(aio_handle, swap_tensors, swap_paths)
      for src, dst in zip(unswapped_srcs, unswapped_dsts):
          dst.data.copy_(src.data)
  
      assert len(swap_tensors) == aio_handle.wait()
  
      return swapped_fp16_tensors
  
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
label_desc: Use image node_id 10 for calling the OptimizerSwapper obj's underlying member method code with example usage: obj._swap_in_fp16_params(aio_handle, fp16_num_elems, fp16_partitions_info, fp16_swap_buffers) and returns: swapped_fp16_tensors