Importing predictor module fails on windows due to incorrect separator replacement

[john-10alabs]

Thanks for stopping by to let us know something could be better!

PLEASE READ: If you have a support contract with Google, please create an issue in the support console instead of filing on GitHub. This will ensure a timely response.

Please run down the following list and make sure you've tried the usual "quick fixes":

• Search the issues already opened: https://github.com/googleapis/python-aiplatform/issues
• Search StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-platform+python

If you are still having issues, please be sure to include as much information as possible:

Environment details

• OS type and version: Windows 11
• Python version: python --version: 3.11
• pip version: pip --version: 25.1.1
• google-cloud-aiplatform version: pip show google-cloud-aiplatform: 1.103.0

Steps to reproduce

1. Use a custom Predictor in a module in a directory below the current directory publishing a local model
2. Build a CPR model and deploy to a local endpoint

Code example

This line converts the path to the Predictor class to posix format, but then attempts to replace os-specific path separators with '.' to convert to an import. On windows, the path separator does not match posix format, thus the posix forward slash remains causing failed imports.

python-aiplatform/google/cloud/aiplatform/utils/prediction_utils.py

Line 76 in 553c423

custom_class_import = custom_class_import_path.as_posix().replace(os.sep, ".")

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!