Fix: User script import now respects script_dir

[tezheng]

Prefer find_spec for user script imports; fallback to spec_from_file_location if not found.

Describe your changes

The original implementation of import_module_from_file incorrectly
checked for the existence of user scripts in the current working
directory (cwd), regardless of the script_dir argument provided in import_user_module.

This PR corrects this behavior by implementing the following logic:

1. Attempt to locate the module using importlib.util.find_spec.
2. Fallback to using importlib.util.spec_from_file_location if find_spec fails

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
• Is this PR including examples changes? If yes, please remember to update example documentation in a follow-up PR.

(Optional) Issue link

#1540

[tezheng]

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[jambayk]

could you provide an example scenario where the current implementation doesn't work?

It was a design decision that the user_script location is independent of the script_dir location so the path to user_script must be absolute or relative to current dir (i.e. wherever the olive command is called from, not the config.json's parent dir) for it to get resolved correctly. Our examples might have the user_script inside script_dir but it is not a requirement.
The only relation between script_dir and user_script is that since script_dir is added to sys.path, user_script can import modules under script_dir directly.

[tezheng]

could you provide an example scenario where the current implementation doesn't work?

See below

It was a design decision that the user_script location is independent of the script_dir location so the path to user_script must be absolute or relative to current dir (i.e. wherever the olive command is called from, not the config.json's parent dir) for it to get resolved correctly.

By "design" you mean this doc, right? Custom Script

Our examples might have the user_script inside script_dir but it is not a requirement. The only relation between script_dir and user_script is that since script_dir is added to sys.path, user_script can import modules under script_dir directly.

This is the origin implementation

def import_module_from_file(module_path: Union[Path, str], module_name: Optional[str] = None):
    module_path = Path(module_path).resolve()
    if not module_path.exists():
        raise ValueError(f"{module_path} doesn't exist")
    ...

It seems this implementation specifically requires module_path (aka user_script) either an absolute path or locates in cwd, regardless of script_dir.

For example, a project structured like

- my_project
  - my_modules
    - file.py
  - model_a
    - workflow.json

workflow.json

{
  "user_script": "file.py",
  "script_dir": "my_modules",
}

Executing below commands will cause ValueError(f"{module_path} doesn't exist"), since cwd is my_project but file.py isn't in the project folder.

cd my_project
olive run --config ./model_a/workflow.json

[tezheng]

What's more, IMHO, I think maybe Path(workflow.json).parent should be always insert into sys.path, since user_script normally will be shipped alongside workflow.json, and its path is usually relative to workflow.json.

Do you think this makes any sense? @jambayk