Fix: Allow loading models from directories for local checkpoints for MUSK and Hibou-L

[dt-yuhui]

Hi there,

This PR addresses an issue that prevents loading certain models like MUSK and Hibou-Large from local checkpoints.

The Problem:

The current implementation of BasePatchEncoder._get_weights_path includes a validation step (ensure_valid_weights_path) that strictly requires the weights path to be a single file. However, the specific load functions for MUSK and Hibou-Large require a path to a directory, not a single checkpoint file. This strict file check makes it impossible to load these models from a local path.

The Solution:

To resolve this, I have commented out the call to ensure_valid_weights_path within _get_weights_path.

This is a minimal change that makes the loading mechanism more flexible. It allows the function to return a path to a directory, which is the expected behavior for loading these types of models. The existing logic for handling single-file checkpoints remains unaffected.

This enhancement will make it much easier for users to work with a broader range of local models, especially in offline environments.

Thanks for your consideration!