Fix MLFlowLogger.save_dir Windows file URI handling (Fixes #20972) #20988
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- Replace simple string slicing with urllib.parse.urlparse and url2pathname - Properly handle Windows absolute file URIs (e.g., file:///C:/path) - Add comprehensive tests for various file URI formats - Fix malformed paths like ///C:/path becoming C:/path on Windows Fixes Lightning-AI#20972
littlebullGit
requested review from
williamFalcon,
lantiga,
Borda,
tchaton,
justusschock and
ethanwharris
as code owners
- Handle both proper file URIs (file:///path) and legacy format (file:/path) - Proper URIs use urlparse/url2pathname for Windows compatibility - Legacy format used by constructor returns path as-is - Update tests to cover both formats and Windows behavior
rittik9
approved these changes
Jul 20, 2025
littlebullGit
changed the title
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Fix MLFlowLogger.save_dir Windows file URI handling
What does this PR do?
Fixes #20972
This PR fixes a bug in
MLFlowLogger.save_dirwhere Windows absolute file URIs were being incorrectly parsed, resulting in malformed local paths that causedFileNotFoundErroron Windows systems.Problem:
When using [MLFlowLogger] with Windows absolute file URIs (e.g.,
file:///C:/Dev/example/mlruns), the [save_dir] property would return malformed paths like///C:/Dev/example/mlrunsinstead of the expectedC:/Dev/example/mlruns, causing file system operations to fail.Solution:
urllib.parse.urlparseandurllib.request.url2pathnamefile:///C:/path)///C:/pathbecomingC:/pathon WindowsChanges:
MLFlowLogger.save_dirproperty to use standard library URI parsing methods📚 Documentation preview 📚: https://pytorch-lightning--20988.org.readthedocs.build/en/20988/