code: def free(self) -> None:
      assert (
          self.offset == 0 and self.callbacks == []
      ), "Incorrect call of teardown"
      self.buffer.storage().resize_(0)
  
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 4 for calling the Bucket obj's underlying member method code with example usage: obj.free() without return types