Preprocess data have the problem

[yongmanlove]

Traceback (most recent call last):
File "downsample.py", line 62, in
scene) = torch.load(data_file)
File "/home/keeping/anaconda3/envs/SoftGroup/lib/python3.8/site-packages/torch/serialization.py", line 705, in load
with _open_zipfile_reader(opened_file) as opened_zipfile:
File "/home/keeping/anaconda3/envs/SoftGroup/lib/python3.8/site-packages/torch/serialization.py", line 243, in init
super(_open_zipfile_reader, self).init(torch._C.PyTorchFileReader(name_or_buffer))
RuntimeError: PytorchStreamReader failed reading zip archive: failed finding central directory

how can i slove this question..