torch cannot load pt files

[talk2much]

[4月 25, 10:52:31] #> Indexing the vectors...
[4月 25, 10:52:31] #> Loading ('/home/yujy/code/Colbert_PRF/index/robust04_index/0.pt', '/home/yujy/code/Colbert_PRF/index/robust04_index/1.pt', '/home/yujy/code/Colbert_PRF/index/robust04_index/2.pt') (from queue)..

Error when loading pt file:

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/site-packages/colbert/indexing/faiss.py", line 92, in _loader_thread
    sub_collection = [load_index_part(filename) for filename in filenames if filename is not None]
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/site-packages/colbert/indexing/faiss.py", line 92, in <listcomp>
    sub_collection = [load_index_part(filename) for filename in filenames if filename is not None]
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/site-packages/colbert/indexing/index_manager.py", line 17, in load_index_part
    part = torch.load(filename)
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/site-packages/torch/serialization.py", line 1005, in load
    with _open_zipfile_reader(opened_file) as opened_zipfile:
  File "/home/yujy/anaconda3/envs/colbert/lib/python3.8/site-packages/torch/serialization.py", line 457, in __init__
    super().__init__(torch._C.PyTorchFileReader(name_or_buffer))
RuntimeError: PytorchStreamReader failed reading zip archive: not a ZIP archive