code: def alloc(self) -> None:
      if self.buffer.storage().size() == 0:
          self.buffer.storage().resize_(self.buffer.numel())
  
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 3 for calling the Bucket obj's underlying member method code with example usage: obj.alloc() without return types