Standalone metrics package

[lars-reimann]

Is your feature request related to a problem?

Several users wanted to compute metrics on their predictions. This is currently not supported. They must instead call the corresponding methods on regressors and classifiers.

Desired solution

• Add a new package ml.metrics.
• Add classes RegressionMetrics and ClassificationMetrics with static methods for individual metrics and a summarized version (see Regressor.summarize_metrics and Classifier.summarize_metrics #713).

We wrap them in a class to

1. no pollute the global namespace too much
2. highlight which metrics are suitable for which task.

The second point was the original reason why we only made metrics available as methods of Regressor and Classifier.

Possible alternatives (optional)

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Additional Context (optional)

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[lars-reimann]

🎉 This issue has been resolved in version 0.25.0 🎉

The release is available on:

• v0.25.0
• GitHub release

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