Python Path Conflict
Python path conflicts cause wrong module versions to be loaded, leading to subtle bugs and errors.
Python path conflicts cause wrong module versions to be loaded, leading to subtle bugs and errors.
What this failure is
Python Path Conflict is a Environment failure seen during ML training runs. Python path conflicts cause wrong module versions to be loaded, leading to subtle bugs and errors. Common tags: Python, Path, Import, Environment.
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Why it happens (the mechanism)
PYTHONPATH includes wrong directory. Site-packages order puts wrong version first. Conda and pip packages conflict. Virtual environment not activated. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.
What you'll observe
- Wrong module version is loaded
- ImportError: cannot import name from different version
- Different behavior in different environments
Common symptoms and what they mean
| Symptom | Why it happens |
|---|---|
| Module loaded from wrong location | PYTHONPATH includes wrong directory |
| Different module version than expected | Site-packages order puts wrong version first |
| ImportError: cannot import name from installed version | Conda and pip packages conflict |
Which systems are affected
- Multiple Python versions installed
- Multiple environments (conda, venv, system)
- Custom PYTHONPATH set incorrectly
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
- ✓Verified signal present: Module loaded from wrong location
- ✓Verified signal present: Different module version than expected
- ✓Verified signal present: ImportError: cannot import name from installed version
- ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.
The fix and the prevention pattern
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Root cause
- PYTHONPATH includes wrong directory
- Site-packages order puts wrong version first
- Conda and pip packages conflict
- Virtual environment not activated
The fix and how to prevent it
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References
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