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4.6 ROC AUC

Slides

Notes

The Area under the ROC curves can tell us how good is our model with a single value. The AUROC of a random model is 0.5, while for an ideal one is 1.

In other words, AUC can be interpreted as the probability that a randomly selected positive example has a greater score than a randomly selected negative example.

Classes and methods:

  • auc(x, y) - sklearn.metrics class for calculating area under the curve of the x and y datasets. For ROC curves x would be false positive rate, and y true positive rate.
  • roc_auc_score(x, y) - sklearn.metrics class for calculating area under the ROC curves of the x false positive rate and y true positive rate datasets.
  • randint(x, y, size=z) - np.random class for generating random integers from the “discrete uniform”; from x (inclusive) to y (exclusive) of size z.

The entire code of this project is available in this jupyter notebook.

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