Refactor for simplification

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancements to file downloading, code cleanup, and improved device selection logic in ultralytics/yolov5 repo.

📊 Key Changes

• 🌍 Downloads: The curl command in downloads.py and general.py now includes a progress bar with -#.
• 🧹 Code Quality: Simplification of for-loops in metrics.py and list comprehensions in plots.py.
• 🔧 Exception handling in plots.py has been streamlined using contextlib.suppress.
• 🛠️ Device Selection: Logic in torch_utils.py now succinctly checks for GPU availability with improved conditions.
• 🎨 Code Cleanup: Refactoring and simplifications are done in torch_utils.py for smartCrossEntropyLoss function.

🎯 Purpose & Impact

• 🚀 Improved User Experience: The progress bar during file downloads provides feedback, enhancing the user interface.
• 🧼 Cleaner Code: Code simplifications make maintenance easier and improve readability for developers.
• ⚙️ Better Handling: Streamlined error suppression in plots minimizes unneeded try-except blocks, improving performance.
• 🖥️ Smoother Setup: Enhanced device selection logic helps avoid potential errors during setup, especially with GPU/CPU device allocations.

These updates are expected to provide both an improved experience for users interacting with download functionalities and a cleaner, more maintainable codebase for developers contributing to the project.