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[tune] Fixed save_to_dir w/ os.replace (#14510)

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The method save_to_dir of the class Searcher in ray.tune.suggest.suggestion.py uses the os.rename method to replace tmp_search_ckpt to current ckpt. os.rename method will raise the [WinError 183] or file exists error of other operating system. os.replace is the currect way.
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EscapeReality846089495 2021-03-06 17:14:56 +08:00 • committed by GitHub
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python/ray/tune/suggest/suggestion.py
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@ -265,7 +265,7 @@ class Searcher:
success = False
if success and os.path.exists(tmp_search_ckpt_path):
os.rename(
os.replace(
tmp_search_ckpt_path,
os.path.join(checkpoint_dir,
self.CKPT_FILE_TMPL.format(session_str)))