code: def available_swap_in_buffers(self):
      return len(self.available_buffer_ids)
  
imports: import os
  import shutil
  from enum import Enum
  import torch
  from deepspeed import comm
  from deepspeed.ops.aio 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 2 for calling the AsyncPartitionedParameterSwapper obj's underlying member method code with example usage: obj.available_swap_in_buffers() and returns: len