refactor init of compressor

[n1ck-guo]

Description

Move some functions that require delayed execution to post_init to avoid bugs caused by incorrect call order.

Type of Change

• Bug fix
• New feature
• Documentation update
• Performance improvement
• Code refactoring
• Other (please specify):

Related Issues

Fixes or relates to #

Checklist Before Submitting

• My code has been tested locally.
• Documentation has been updated as needed.
• New or updated tests are included where applicable.

[Copilot]

Pull request overview

This PR refactors the initialization logic of the compressor by introducing a _post_init method to handle operations that require delayed execution. The changes move various setup operations from __init__ to _post_init to prevent bugs caused by incorrect call ordering, particularly for operations that depend on the model being fully loaded or other initialization steps being complete.

Changes:

• Introduced a _post_init method to handle delayed initialization logic including scheme parsing, device setup, seed setting, and torch compile adjustments
• Moved output directory path calculation logic from __main__.py into the quantize_and_save method
• Simplified __init__ by deferring complex initialization steps that have dependencies on other attributes

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
auto_round/compressors/base.py	Refactored initialization by moving delayed-execution logic (scheme parsing, device setup, seed setting, etc.) from __init__ to new _post_init method; added path calculation to quantize_and_save and save_quantized
auto_round/main.py	Simplified by removing output directory path calculation logic that was moved into the compressor class

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.