reportAttributeAccessIssue on Hugging Face transformers top-level attributes only in Pre-Release

[ringohoffman]

Environment data

• Pylance version: 2025.2.100
• OS and version: Mac OS Sonoma 14.6.1 (23G93) & Ubuntu 22.04.5 LTS (remote)
• Python version (& distribution if applicable, e.g. Anaconda): Miniconda, Python 3.10.16

Code Snippet

import transformers

transformers.PreTrainedModel  # "PreTrainedModel" is not a known attribute of module "transformers" Pylance[reportAttributeAccessIssue]

Repro Steps

1. pip install transformers==4.47.1
2. Install pre-release version of Pylance (I'm on 2025.2.100)
3. Python: Clear Cache and Reload Window

Expected behavior

1. Compare this with the release version 2025.2.1 which does not show this behavior

Actual behavior

1. "PreTrainedModel" is not a known attribute of module "transformers" Pylance[reportAttributeAccessIssue]

[debonte]

Works in Pyright 1.1.394, so this seems to be a Pylance-specific issue.

Strangely, hover shows info about PreTrainedModel despite the diagnostic:

There's also something weird going on with environment selection. Every time I reload the window, I need to respecify the environment path even if the path shown in the status bar looks correct.

[StellaHuang95]

Deleting the partial stubs here seems to resolve the issue, still need to invesigate what the root cause is. pyrx/packages/pylance-internal/bundled/stubs/transformers-stubs at main · microsoft/pyrx

Here're more findings using Pylance preview:

with bundled stubs + without manually copied stubs -> repro
with bundled stubs + with manually copied stubs -> repro
without bundled stubs + without manually copied stubs -> not repro
without bundled stubs + with manually copied stubs -> not repro

Rich thinks it's a linking issue.

[debonte]

This issue has been fixed in prerelease version 2025.2.102, which we've just released. You can find the changelog here: CHANGELOG.md