Add notebook_init() to utils/__init__.py

[glenn-jocher]

PR features shorter and simpler YOLOv5 notebook Setup cell:

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Refinement of YOLOv5 Tutorial Notebook and Initialization Utilities

📊 Key Changes

• Updated Colab Badge Link: Modified Colab badge link to point to a branch-specific notebook URL.
• Streamlined Setup Code: Simplified the notebook setup steps, including command comments and removed explicit Torch dependency code snippets.
• Enhanced Import & Initialization: Replaced direct imports and print statements with a new utils.notebook_init function call to check setup.
• Image Display Update: Switched from the IPython display method to a new utils.notebook_init managed method for displaying images.
• Comment & Output Cleanup: Removed some comments and reset execution counts for blocks, signifying they need to be run afresh.
• New Utility Function: Added notebook_init in the utils module to manage setup for notebooks.
• Adjusted select_device Function: Updated the torch_utils.select_device function to include a newline option, now removing trailing newlines in specific scenarios.

🎯 Purpose & Impact

• Improved User Experience: The updated links and setup steps provide a smoother, more streamlined start-up for users trying out YOLOv5 notebooks.
• Code Clarity: Simplification of initial commands helps users better understand the steps required to set up their environment.
• Consistency in Display: By standardizing the way images are displayed in the notebook with the new method, there is less room for errors and a more uniform output presentation.
• Maintenance and Reusability: The addition of the notebook_init function suggests a move toward modular code, which is easier to maintain and update, providing a single point of setup adjustments for future changes.
• Potential for Wide Impact: These changes could affect all new users experimenting with the Ultralytics YOLOv5 tutorial notebook, thus enhancing the initial learning curve.

[glenn-jocher]

PR is done. Features shorter and simpler YOLOv5 notebook Setup cell: