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Variance, Informally
Informally, variance is the amount by which a model performs worse on dev or test data than it does on its training data. In plain terms, it describes the performance gap between the training set and a held-out set.
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Learn After
What does variance mean in this informal comparison?
A larger performance gap between training data and validation data is an informal sign of variance.
Variance compares test performance to the ____ performance.
Match each term to its role in the informal variance idea.
Order the steps for judging whether a model has high variance
Why does the informal idea of variance require a comparison between training and held-out results?
Interpret a gap between training and validation performance.
What does “worse” mean in an informal variance comparison?
What information is needed to judge variance informally?
An informal variance score is defined as training-set error minus test-set error.