Refactor to use shared plot functions

[guopengf]

Fixes # .

Refactor the mask_augmentation_example notebook to use shared plot functions.

Description

A few sentences describing the changes proposed in this pull request.

Checks

• [x] Avoid including large-size files in the PR.
• [x] Clean up long text outputs from code cells in the notebook.
• [ ] For security purposes, please check the contents and remove any sensitive info such as user names and private key.
• [ ] Ensure (1) hyperlinks and markdown anchors are working (2) use relative paths for tutorial repo files (3) put figure and graphs in the ./figure folder
• [x] Notebook runs automatically ./runner.sh -t <path to .ipynb file>

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