Adding a demo of the automatic TPU system metrics feature

[wylerz]

Add system metrics examples colab dir; add TPU colab; ruff format and remove global wandb use;

[review-notebook-app]

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Thanks for contributing to wandb/examples!
We appreciate your efforts in opening a PR for the examples repository. Our goal is to ensure a smooth and enjoyable experience for you 😎.

Guidelines

The examples repo is regularly tested against the ever-evolving ML stack. To facilitate our work, please adhere to the following guidelines:

• Notebook naming: You can use a combination of snake_case and CamelCase for your notebook name. Avoid using spaces (replace them with _) and special characters (&%$?). For example:

Cool_Keras_integration_example_with_weights_and_biases.ipynb 

is acceptable, but

Cool Keras Example with W&B.ipynb

is not. Avoid spaces and the & character. To refer to W&B, you can use: weights_and_biases or just wandb (it's our library, after all!)

• Managing dependencies within the notebook: You may need to set up dependencies to ensure that your code works. Please avoid the following practices:

  • Docker-related activities. If Docker installation is required, consider adding a full example with the corresponding Dockerfile to the wandb/examples/examples folder (where non-Colab examples reside).
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  pip install -qU wandb transformers gpt4
  

  is acceptable, but

  pip install -qU wandb
  import wandb

  is not.

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  You don't need to clone, then cd into the repo and install it in editable mode.

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• The Jupyter notebook file .ipynb is nothing more than a JSON file with primarily two types of cells: markdown and code. There is also a bunch of other metadata specific to Google Colab. We have a set of tools to ensure proper notebook formatting. These tools can be found at wandb/nb_helpers.

Before merging, wait for a maintainer to clean and format the notebooks you're adding. You can tag @tcapelle.

Before marking the PR as ready for review, please run your notebook one more time. Restart the Colab and run all. We will provide you with links to open the Colabs below

The following colabs were changed
-colabs/system_metrics/WandB_Llama3_1_Training_Colab_TPU.ipynb