code: def avail_size(self) -> int:
      return self.buffer.size(0) - self.offset
  
file_path: ColossalAI/colossalai/legacy/nn/parallel/reducer.py
imports: import functools
  from typing import Callable, Dict, List, Optional, Tuple
  import torch
  import torch.distributed
  from torch import Tensor
  from torch.distributed import ProcessGroup
label_desc: Use image node_id 6 for calling the Bucket obj's underlying member method code with example usage: obj.avail_size() and returns: unknown