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Fix broken checkpoints of pytorch_checkpoint.py #4

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Motivation

Currently, checkpoint files can be broken if processes are terminated during torch.save as can be seen in https://github.com/optuna/optuna-examples/runs/3546315890?check_suite_focus=true. This PR fixes the issue.

Description of the changes

  • Save checkpoint files as temporary files (tmp_model.pt).
  • Rename it to model.pt

@toshihikoyanase toshihikoyanase added the bug Something isn't working label Sep 9, 2021
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