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Practicing Trustworthy Machine Learning
book

Practicing Trustworthy Machine Learning

by Yada Pruksachatkun, Matthew Mcateer, Subho Majumdar
January 2023
Intermediate to advanced
300 pages
8h 8m
English
O'Reilly Media, Inc.
Content preview from Practicing Trustworthy Machine Learning

Chapter 4. Robustness

We know that ML models are not very generalizable—change a few things to the input, and the model breaks. A model’s ability to be resilient to variation in data is called robustness. To put things intuitively, no matter how good your training data is, the model is going to encounter unexpected things in the real world, and robustness is about making sure it’s ready for them.

Tip

At the core of this problem is the fact that you’re almost always training a model to solve for a proxy problem. For example, if you’re trying to make a dog versus cat image classifier, optimizing an image classifier to minimize the error on your limited training set is just a proxy. Your real goal is to distinguish cats and dogs in all possible cases, but the best you can do is this proxy because your computing resources are finite.

Sometimes, optimizing for your proxy won’t bring you very close to your real goal. Sometimes, if you optimize your proxy too much, your overoptimizing will cause you to do worse on your true goal. AI safety researchers have demonstrated that this applies to every single proxy measure ever (whether it’s an AI or human or group of humans doing the optimizing).1 Your best bet is to know what to look out for and spot early the signs that you’re overoptimizing.

There are two kinds of robustness: train-time robustness and test-time robustness. Train-time robustness focuses on the model’s ability to be resilient to adversarial examples added to the training ...

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Publisher Resources

ISBN: 9781098120269Errata Page