Fix test script

[Binyang2014]

Fix: #654. Address correctness_test.py crash issue

[Copilot]

Pull Request Overview

This PR fixes a crash issue in the correctness test script by properly initializing the distributed process group with explicit parameters and adding proper cleanup logic.

Key changes:

• Explicit initialization of distributed process group with rank, world_size, and device_id parameters
• Addition of proper test cleanup with barrier synchronization and process group destruction

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}