code: def reserve_available_buffers(self):
      buffers = []
      for id in self.available_buffer_ids:
          buffers.append(
              self.buffers.narrow(
                  0,
                  int(id * self.aligned_elements_per_buffer),
                  int(self.aligned_elements_per_buffer),
              )
          )
          self.reserved_buffer_ids.append(id)
  
      self.available_buffer_ids = []
      return buffers
  
imports: import os
  import shutil
  from enum import Enum
  import torch
  from deepspeed import comm
  from deepspeed.accelerator import get_accelerator
  from deepspeed.ops.op_builder import AsyncIOBuilder
  from .constants import *
  from .utils import swap_in_tensors, swap_out_tensors, MIN_AIO_BYTES, AIO_ALIGNED_BYTES, print_object, SwapBufferPool
label_desc: Use image node_id 19 for calling the AsyncPartitionedParameterSwapper obj's underlying member method code with example usage: obj.reserve_available_buffers() and returns: buffers